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Python Interview Questions And Answers For Experienced 2018

Python Interview Questions And Answers For Experienced 2018. Here Coding compiler sharing a list of 165 interview questions on python for freshers and experienced. This list consists of Python basic interview questions to advanced Python interview questions for 1 year experienced, 2 years experienced, 3 years experienced, 4 years experienced and 5+ years experienced developers. These Python questions were prepared by Python expert developers and asked in various Python Interviews. We hope that this list will help you to crack your next Python job interview. All the best for your future and happy learning.

Python Interview Questions

What is Python programming language?
Who created Python?
What are the features of Python?
What are the programming-language features of Python?
What is Python used for?
What is Python Package Manager (PyPM)?
What is Python web application framework?
Name few Python web application frameworks?
Name few Python Checkers for Debugging?
What is the Python interactive console or Python shell?
What is the difference between Python 2 and Python 3?
Name few Python Shells?
What is the Python IDLE?
What is an interpreter for Python?
How do you run a Python script?
How many modes are there in Python?
What is a Script mode?
What is the interactive mode?
What is the use of Pycharm?
Why is Python so powerful?

Python Interview Questions And Answers

Here you can find a list of 165 Python interview questions, Python programming questions, Python real-time scenarios. Let’s start reading.

Python Basic Interview Questions

1) What is Python programming language?

A) Python is an interpreted high-level programming language for general-purpose programming.

Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level built in data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, as well as for use as a scripting or glue language to connect existing components together.

2) Who created Python?

A) Created by Guido van Rossum and first released in 1991.

3) What are the features of Python?

A) Some of Python’s notable features:

Uses an elegant syntax, making the programs you write easier to read.

Is an easy-to-use language that makes it simple to get your program working. This makes Python ideal for prototype development and other ad-hoc programming tasks, without compromising maintainability.

Comes with a large standard library that supports many common programming tasks such as connecting to web servers, searching text with regular expressions, reading and modifying files.

Python’s interactive mode makes it easy to test short snippets of code. There’s also a bundled development environment called IDLE.

Is easily extended by adding new modules implemented in a compiled language such as C or C++.

Can also be embedded into an application to provide a programmable interface.

Runs anywhere, including Mac OS X, Windows, Linux, and Unix, with unofficial builds also available for Android and iOS.

4) What are the programming-language features of Python?

A) programming-language features of Python are:

A variety of basic data types are available: numbers (floating point, complex, and unlimited-length long integers), strings (both ASCII and Unicode), lists, and dictionaries.

Python supports object-oriented programming with classes and multiple inheritance.

Code can be grouped into modules and packages.

The language supports raising and catching exceptions, resulting in cleaner error handling.

Data types are strongly and dynamically typed. Mixing incompatible types (e.g. attempting to add a string and a number) causes an exception to be raised, so errors are caught sooner.

Python contains advanced programming features such as generators and list comprehensions.

Python’s automatic memory management frees you from having to manually allocate and free memory in your code.

5) What is Python used for?

A) Python is a general-purpose programming language, it can be used to test microchips, building web applications, desktop applications, video games, artificial intelligence, machine learning and data science. With the help of third-party libraries, we can build any kind of applications using Python programming language.

6) What is Python Package Manager (PyPM)?

A) Python Package Manager (PyPM) is a Python utility intended to simplify the tasks of locating, installing, upgrading and removing Python packages. It can determine if the most recent version of a software package is installed on a system, and can install or upgrade that package from a local or remote host.

7) What is Python web application framework?

A) Web application frameworks, or simply “web frameworks”, are the de facto way to build web-enabled applications. From simple blogs to complex AJAX-rich applications.

8) Name few Python web application frameworks?

A) There are many Python web application frameworks are there, they are

django – Django is a high-level Python Web framework.

web2py – An open source full-stack python web framework for scalable, secure and portable

flask – A lightweight Python web framework based on Werkzeug and Jinja 2.

grok – An open-source Web framework based on Zope Toolkit technology.

tornado – Tornado is a scalable, non-blocking web server and web application framework.

cherrypy – CherryPy is an object-oriented web application framework.

turbogears – A Python-based database web app framework with Ajax integration.

google app engine – A platform for developing and hosting web applications in Google-managed data centers, including Python.

pylons – A lightweight web framework emphasizing flexibility and rapid development.

9) Name few Python Checkers for Debugging?

A) There are many debugging tools out there, few of them are:

Pychecker – A tool for finding bugs in python source code.

pudb – PuDB is a full-screen, console-based visual debugger for Python.

pdb – The module pdb defines an interactive source code debugger for Python programs.

pylint – Analyzes Python source code looking for bugs and signs of poor quality.

10) What is the Python interactive console or Python shell?

A) The Python interactive console, also known as the Python interpreter or Python shell. It provides programmers with a quick way to execute commands and try out or test code without creating a file.

Providing access to all of Python’s built-in functions and any installed modules, command history, and auto-completion, the interactive console offers the opportunity to explore Python and the ability to paste code into programming files when you are ready.

Python Interview Questions For Beginners

11) What is the difference between Python 2 and Python 3?

A) Python 2.7 and Python 3 share many similar capabilities, they should not be thought of as entirely interchangeable. Though you can write good code and useful programs in either version, it is worth understanding that there will be some considerable differences in code syntax and handling.

12) Name few Python Shells?

A) Here is the list of few Python shells,

dreampie – A graphical interactive Python shell which is designed to be reliable and fun.
ipython – A development shell both written in and designed for Python.
bpython – A fancy interface to the Python interpreter for Linux, BSD, OS X and Windows.

13) What is the Python IDLE?

A) IDLE (short for integrated development environment or integrated development and learning environment) is an integrated development environment for Python, which has been bundled with the default implementation of the language since 1.5.2b1.

14) What is an interpreter for Python?

A) The interpreter operates somewhat like the Unix shell: when called with standard input connected to a tty device, it reads and executes commands interactively; when called with a file name argument or with a file as standard input, it reads and executes a script from that file.

15) How do you run a Python script?

A) Run a Python script under Windows with the Command Prompt. Note that you must use the full path of the Python interpreter. If you want to simply type python.exe C:\Users\Username\Desktop\my_python_script.py you must add python.exe to your PATH environmental variable.

Python Interview Questions And Answers For Beginners

16) How many modes are there in Python?

A) Python has two basic modes: script and interactive.

17) What is a Script mode?

A) The normal mode is the script mode where the scripted and finished .py files are run in the Python interpreter.

18) What is the interactive mode?

A) Interactive mode is a command line shell which gives immediate feedback for each statement, while running previously fed statements in active memory.

19) What is the use of Pycharm?

A) PyCharm is an Integrated Development Environment (IDE) used in computer programming, specifically for the Python language. It provides code analysis, a graphical debugger, an integrated unit tester, integration with version control systems (VCSes), and supports web development with Django.

20) Why is Python so powerful?

A) Python is easy to use, powerful, and versatile, making it a great choice for beginners and experts alike. Python’s readability makes it a great first programming language — it allows you to think like a programmer and not waste time understanding the mysterious syntax that other programming languages can require.

Python Interview Questions For Freshers

21) What is the script in python?

A) Scripts are reusable. Basically, a script is a text file containing the statements that comprise a Python program. Once you have created the script, you can execute it over and over without having to retype it each time. Scripts are editable.

22) What is Anaconda program?

A) Anaconda (Python distribution) Anaconda is a freemium open source distribution of the Python and R programming languages for large-scale data processing, predictive analytics, and scientific computing, that aims to simplify package management and deployment.

23) Where do you use Python programming? Can you describe in detail?

A) Python is a scripting language like PHP, Perl, Ruby and so much more. It can be used for web programming (django, Zope, Google App Engine, and much more). But it also can be used for desktop applications (Blender 3D, or even for games pygame). Python can also be translated into binary code like java.

24) What is a REPL in Python?

A) A Read–Eval–Print Loop (REPL), also known as an interactive top-level or language shell, is a simple, interactive computer programming environment that takes single user inputs (i.e. single expressions), evaluates them, and returns the result to the user; a program written in a REPL environment is executed piecewise.

25) Is Python is a case sensitive?

A) Python language is case sensitive.

Case sensitive means that a is different from A.

The variable of Michel is different from the variable of michel.

If we assume a value for a (lowercase a) and then call A (uppercase A), we will see the following error message:

Copy
>>>a=2
>>>A

Traceback (most recent call last):
File “<pyshell#1>”, line 1, in <module>
A
NameError: name ‘A’ is not defined
>>>
In the above example, A is not assigned any value.

Thus, when we call it by typing A, we will receive an error message. Note that the last line mentions NameError instead of TypeError. In Python, we use name for variables.

Python Interview Questions And Answers For Freshers

26) What is a file in Python?

A) A file is some information or data which stays in the computer storage devices. Python gives you easy ways to manipulate these files. Generally we divide files in two categories, text file and binary file. Text files are simple text where as the binary files contain binary data which is only readable by computer.

27) What is the input function in Python?

A) Input can come in various ways, for example from a database, another computer, mouse clicks and movements or from the internet. Yet, in most cases the input stems from the keyboard. For this purpose, Python provides the function input(). input has an optional parameter, which is the prompt string.

28) Is Python a compiled or interpreted language?

A) Python will fall under byte code interpreted. . py source code is first compiled to byte code as .pyc. This byte code can be interpreted (official CPython), or JIT compiled (PyPy). Python source code (.py) can be compiled to different byte code also like IronPython (.Net) or Jython (JVM).

29) How do I run a Python script?

30) What is the directory in Python?

A) A directory or folder is a collection of files and sub directories. Python has the os module, which provides us with many useful methods to work with directories (and files as well).

Python Interview Questions For 1 Year Experienced

31) What is a dictionary in python?

A) A dictionary is an associative array (also known as hashes). Any key of the dictionary is associated (or mapped) to a value. The values of a dictionary can be any Python data type. So dictionaries are unordered key-value-pairs.

32) What is the meaning of stdin in Python?

A) When you run your Python program, sys.stdin is the file object connected to a standard input (STDIN), sys.stdout is the file object for standard output (STDOUT), and sys.stderr is the file object for standard error (STDERR).

33) What is PyTables?

A) PyTables is a package for managing hierarchical datasets and designed to efficiently and easily cope with extremely large amounts of data. You can download PyTables and use it for free.

34) What is the output of this line?

>>>100/(1+0.1)^2

A) It will give the error message saying that ^ is not supported.

>>>100/(1+0.1)^2
Traceback (most recent call last):
File “<psyhell#1>, line 1, in <module>
100/(1+0.1)^2
TypeError: unsupported operand type(s) for ^: ‘float’ and ‘int’
>>>

35) How do you find the current version of Python?

A) By using sys.version we can fidn the current version of Python. See below example,

>>>import sys
>>>sys.version
‘3.6.4 (v3.6.4:d047928ae3f6, April 16 2018, 00:10:25) [MSC v.1600 64 bit (Intel)]’
>>>

Python Questions And Answers For 1 Year Experienced

36) What is the difference between interpreted and compiled languages?

A) Java (interpreted) and C (or C++) (compiled) might have been a better example. Basically, compiled code can be executed directly by the computer’s CPU. The code of interpreted languages however must be translated at run-time from any format to CPU machine instructions. This translation is done by an interpreter.

37) Is Python Interpreted or Compiled?

A) py source code is first compiled to byte code as .pyc. This byte code can be interpreted (official CPython), or JIT compiled (PyPy). Python source code (.py) can be compiled to different byte code also like IronPython (.Net) or Jython (JVM). There are multiple implementations of Python language.

38) What is an interpreter for Python?

39) Is Python a procedural language?

A) Python is a multi-paradigm; you can write programs or libraries that are largely procedural, object-oriented, or functional.

40) What is lambda function in Python?

A) The lambda operator or lambda function is a way to create small anonymous functions, i.e. functions without a name. These functions are throw-away functions, i.e. they are just needed where they have been created. Lambda functions are mainly used in combination with the functions filter(), map() and reduce().

Python Advanced Interview Questions

41) What is a list in Python?

A) A list is a data structure in Python that is a mutable, or changeable, ordered sequence of elements. Each element or value that is inside of a list is called an item.

42) What is the input function in Python?

43) What is standard output in Python?

A) Standard output and standard error (commonly abbreviated stdout and stderr) are pipes that are built into every UNIX system. When you print something, it goes to the stdout pipe; when your program crashes and prints out debugging information (like a traceback in Python), it goes to the stderr pipe.

44) What is the meaning of DEF in Python?

A) A function in Python is defined by a def statement.

Example:
def f():
print(‘In function f’)
print(‘When does this print?’)

Best Python Interview Questions

45) How do you call functions in Python?

A) We will see with the example:

# Defining a function
def my_function():

print(“Hello From My Function!”)

# print a simple greeting by calling a function
my_function()

46) What is self in Python?

A) The first argument of every class method, including init, is always a reference to the current instance of the class. By convention, this argument is always named self. In the init method, self-refers to the newly created object; in other class methods, it refers to the instance whose method was called.

47) How many coding styles are there in Python?

A) There are four main Python coding styles: imperative, functional, object-oriented, and procedural.

48) What is the use of MAP in Python?

A) The map function is the simplest one among Python built-ins used for functional programming. These tools apply functions to sequences and other iterables. The filter filters out items based on a test function which is a filter and apply functions to pairs of item and running result which is reduce.

49) What is a sequence in Python?

A) In Python, sequence is the generic term for an ordered set. There are several types of sequences in Python, the following three are the most important. Lists are the most versatile sequence type. The elements of a list can be any object, and lists are mutable – they can be changed.

50) What does ORD () do in Python?

A) ord(c) in Python Given a string of length one, return an integer representing the Unicode code point of the character when the argument is a unicode object, or the value of the byte when the argument is an 8-bit string.

For example, ord(‘a’) returns the integer 97.

Python Interview Questions For 2 Years Experienced

51) What is a tuple in Python?

A) A tuple is a sequence of immutable Python objects. Tuples are sequences, just like lists. The differences between tuples and lists are, the tuples cannot be changed unlike lists.

52) What is a list in Python?

A) A list is a data structure in Python that is a mutable, or changeable, ordered sequence of elements. Each element or value that is inside of a list is called an item.

53) What is the difference between a list and a tuple?

A) List is mutable and tuples is immutable. The main difference between mutable and immutable is memory usage when you are trying to append an item. When you create a variable, some fixed memory is assigned to the variable. If it is a list, more memory is assigned than actually used.

54) What is a cast in Python?

A) Casting is when you convert a variable value from one type to another. This is, in Python, done with functions such as int() or float() or str() . A very common pattern is that you convert a number, currently as a string into a proper number.

55) Can you explain this why are we getting an error here?

>>>sqrt(3)
Traceback (most recent call last):
File “<pyshell#17>”, line 1, in <module>
sqrt(3)
NameError: name ‘sqrt’ is not defined

A) In the above code, sqrt() function is available in the “math” module and that we have to load import the “math” module before we can call the “sqrt()” functions.

Python Top Interview Questions

56) What is a module in python?

A) In Python, module is a package that contains a set of functions to do a specific task. For example “math” module provides some math related functions like sqrt().

57) What is the use of dir() function?

A) After assigning values to a few variables, we could use the dir() function to show their existence. In the following example, variables p, av, and d are shown among other names.

>>>av=100
>>>p=0.1
>>>d=5
>>>dir()
[‘p’, ‘av’, ‘d’]

58) How can you unsign or delete variable in Python?

A) Whenever we write code for any application, it might be a good practice to delete those variables that we no longer need. In this case, we could use the del() function to remove or unsign a variable.

59) What is tuple in Python?

A) In Python, a tuple is a data type or object. A tuple could contain multiple data types such as integer, float, string, and even another tuple. All data items are included in a pair of parentheses as shown in the following example:

>>>x=(‘John’,21)
>>>x
(‘John’, 21)

60) How can you find length of a tuple in Python?

A) Like with strings and lists, we can calculate the length of a tuple by using len().

Python Interview Questions For 3 Years Experienced

61) What is string replication operator in Python?

A) * is the string replication operator, repeating a single string however many times you would like through the integer you provide.

Example: Let’s print out “Python” 5 times without typing out “Python” 5 times with the * operator:

print(“Python” * 5)

Output: PythonPythonPythonPythonPython

62) What is the output of this below query?

ss = “Python Programming!”
print(ss[5])

A) Output of the above code is: n

63) What is GIL in Python?

A) In Python, GIL (Global Interpreter Lock) is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes at once.

64) What is meant by mutex in Python?

A) In Python programming, a mutex (mutual exclusion object) is a program object that is created so that multiple program thread can take turns sharing the same resource, such as access to a file.

65) Is Python supports Multithreading?

A) Yes Python supports multithreading concept with the help of Global Interpreter Lock (GIL).

Python Advanced Interview Questions And Answers

66) Explain the use of Ternary operator in Python?

A) In Python, Ternary operator added in the version 2.5. It is used as a conditional statement, it consists of the true or false values. Ternary operator evaluates the statement and stores true or false values.

Python Ternary Operator Syntax :

[on_true] if [expression] else [on_false]

Python Ternary Operator Example:

a, b = 22, 35

# Checking the minimum number and storing in mini
mini = a if a < b else b

print(mini)

Output: 22

67) What is memory management in Python?

A) Memory management in Python involves a private heap containing all Python objects and data structures. The management of this private heap is ensured internally by the Python memory manager.

68) What are the components of Python Memory Manager?

A) The Python memory manager has different components which deal with various dynamic storage management aspects, like sharing, segmentation, preallocation or caching.

69) What are the types of inheritance in Python?

A) Python supports different types of inheritance, they are:

Single Inheritance
Multi-level Inheritance
Hierarchical Inheritance
Multiple Inheritance

Advanced Python Interview Questions

70) What is superclass and subclass in Python?

A) In Python, the parent class as a superclass. The class that’s derived from the superclass is called the subclass.

71) What is MRO in Python?

A) In multiple inheritance, the order in which base classes are searched when looking for a method is often called the Method Resolution Order (MRO).

72) What is super () in Python?

A) Super() is used to return a proxy object that delegates method calls to a parent or sibling class of type.

73) What is overriding in Python?

A) In Python, Overriding is the ability of a class to change the implementation of a method provided by one of its ancestors. Overriding is a very important part of OOP since it is the feature that makes inheritance exploit its full power.

74) What is an abstract class in Python?

A) An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods. Subclasses of an abstract class in Python are not required to implement abstract methods of the parent class.

75) Is multiple inheritances possible in python?

A) Multiple inheritance on the other hand is a feature in which a class can inherit attributes and methods from more than one parent class. Python has a sophisticated and well-designed approach to multiple inheritance.

Advanced Python Interview Questions And Answers

76) What is operator overloading in python?

A) Operator overloading (less commonly known as ad-hoc polymorphism) is a specific case of polymorphism (part of the OO nature of the language) in which some or all operators like +, = or == are treated as polymorphic functions and as such have different behaviors depending on the types of its arguments.

Example: You can use + operator for adding numbers and at the same time to concatenate strings. It is possible because + operator is overloaded by both int class and str class. The operators are actually methods defined in respective classes.

77) What is a decorator in Python?

A) Decorators provide a simple syntax for calling higher-order functions. By definition, a decorator is a function that takes another function and extends the behavior of the latter function without explicitly modifying it.

78) Why do you use abstract classes?

A) Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.

79) What is a constructor in Python?

A) A constructor is a special kind of method that Python calls when it instantiates an object using the definitions found in your class. Python relies on the constructor to perform tasks such as initializing (assigning values to) any instance variables that the object will need when it starts.

Python Interview Questions For 4 Years Experienced

80) What is a model in python?

A) A model is the single, definitive source of information about your data. It contains the essential fields and behaviors of the data you’re storing. Generally, each model maps to a single database table.

81) What is repr() function in Python?

A) repr() function evaluate the string representation of an object.

82) What is a Numpy in Python?

A) NumPy is a library for the Python programming language, adding support for large, multi-dimensional arrays and matrices, along with a large collection of high-level mathematical functions to operate on these arrays.

83) What is a panda in Python?

A) pandas is a Python package providing fast, flexible, and expressive data structures designed to make working with “relational” or “labeled” data both easy and intuitive. It aims to be the fundamental high-level building block for doing practical, real world data analysis in Python.

84) What is yield in Python?

A) The yield statement in Python is used to define generators, replacing the return of a function to provide a result to its caller without destroying local variables. Unlike a function, where on each call it starts with new set of variables, a generator will resume the execution where it was left off.

Python Interview Questions For Experienced

85) What is an iterator in python?

A) In Python, an iterator is an object which implements the iterator protocol. The iterator protocol consists of two methods. The __iter__() method, which must return the iterator object, and the next() method, which returns the next element from a sequence.

86) What is ABS in Python?

A) The abs() function is used to return the absolute value of a number.

Syntax: abs(number)

number can be integer, a floating point number or a complex number. The abs() takes only one argument, a number whose absolute value is to be returned.

87) What is Matplotlib for Python?

A) Matplotlib is a plotting library for the Python programming language and its numerical mathematics extension NumPy. It provides an object-oriented API for embedding plots into applications using general-purpose GUI toolkits like Tkinter, wxPython, Qt, or GTK+.

89) What is a PIL in Python?

A) Python Imaging Library (abbreviated as PIL) (in newer versions known as Pillow) is a free library for the Python programming language that adds support for opening, manipulating, and saving many different image file formats. It is available for Windows, Mac OS X and Linux.

90) What does ORD () do in Python?

Python Interview Questions And Answers For Experienced

91) What is the Scipy?

A) SciPy is an open-source Python library used for scientific computing and technical computing. The NumPy stack is also sometimes referred to as the SciPy stack.

92) What is lambda function in Python?

93) What does Isalpha do in Python?

A) In Python, isalpha() is a built-in method used for string handling. The isalpha() methods returns “True” if all characters in the string are alphabets, Otherwise, It returns “False”.

94) What is a Sympy?

A) SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python.

95) What is a data structure in Python?

A) The builtin data structures in Python are: lists, tuples, dictionaries, strings, sets and frozensets. Lists, strings and tuples are ordered sequences of objects. Unlike strings that contain only characters, list and tuples can contain any type of objects.

Interview Questions on Python For Experienced

96) What is coercion?

A) The implicit conversion of an instance of one type to another during an operation which involves two arguments of the same type. For example, int(3.15) converts the floating point number to the integer 3, but in 3+4.5, each argument is of a different type (one int, one float), and both must be converted to the same type before they can be added or it will raise a TypeError.

Without coercion, all arguments of even compatible types would have to be normalized to the same value by the programmer, e.g., float(3)+4.5 rather than just 3+4.5.

97) What is Flask in Python?

A) Flask is a micro web framework written in Python and based on the Werkzeug toolkit and Jinja2 template engine.

98) What is Redis Python?

A) Redis is an in-memory key-value pair NoSQL data store often used for web application sessions, transient data and as a broker for task queues. redis-py is a common Python code library for interacting with Redis.

99) How can you explicitly free memory in Python?

A) In Python, You can force the Garbage Collector to release unreferenced memory with gc.collect().

Example:
import gc
gc.collect()

100) What is Monkey Patching in Python?

A) Monkey patching is reopening the existing classes or methods in class at runtime and changing the behavior, which should be used cautiously, or you should use it only when you really need to.

Python Interview Questions For 5 Years Experienced

101) What is range and xrange in Python?

A) xrange is a sequence object that evaluates lazily. range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements. xrange is a generator, so it is a sequence object is a that evaluates lazily.

102) What is pickling and Unpickling?

A) Pickling is the process whereby a Python object hierarchy is converted into a byte stream, and Unpickling – is the inverse operation, whereby a byte stream is converted back into an object hierarchy. Pickling (and unpickling) is alternatively known as serialization, marshalling, or flattening.

103) Is there a benefit to using one over the other? In Python 2, they both seem to return the same results:

>>> 6/3
2
>>> 6//3
2

A) In Python 3.0, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division.

In Python 2.2 or later in the 2.x line, there is no difference for integers unless you perform a from __future__ import division, which causes Python 2.x to adopt the behavior of 3.0

Regardless of the future import, 5.0 // 2 will return 2.0 since that’s the floor division result of the operation.

104) What is Python slice()?

A) The slice object is used to slice a given sequence (string, bytes, tuple, list or range) or any object which supports sequence protocol.

105) What is the output of this code?

print(slice(3))

print(slice(1, 5, 2))

A) The above code prints below results,

slice(None, 3, None)
slice(1, 5, 2)

Python Experienced Interview Questions

106) Guess the output?

pyList = [‘P’, ‘y’, ‘t’, ‘h’, ‘o’, ‘n’]

pyTuple = (‘P’, ‘y’, ‘t’, ‘h’, ‘o’, ‘n’)

sObject = slice(3)

# slice a list

print(pyList[sObject])

sObject = slice(1, 5, 2)

# slice a tuple

print(pyTuple[sObject])

A) The output would be,

[‘P’, ‘y’, ‘t’]

(‘y’, ‘h’)

107) How to test multiple variables against a value?

I’m trying to make a function that will compare multiple variables to an integer and output a string of three letters. I was wondering if there was a way to translate this into Python. So say:

x = 0
y = 1
z = 3
mylist = []

if x or y or z == 0 :
mylist.append(“c”)
if x or y or z == 1 :
mylist.append(“d”)
if x or y or z == 2 :
mylist.append(“e”)
if x or y or z == 3 :
mylist.append(“f”)
which would return a list of

[“c”, “d”, “f”]
Is something like this possible?

A) You misunderstand how boolean expressions work; they don’t work like an English sentence and guess that you are talking about the same comparison for all names here. You are looking for:

if x == 1 or y == 1 or z == 1:
x and y are otherwise evaluated on their own (False if 0, True otherwise).

You can shorten that using a containment test against a tuple:

if 1 in (x, y, z):
or better still:

if 1 in {x, y, z}:
using a set to take advantage of the constant-cost membership test (in takes a fixed amount of time whatever the left-hand operand is).

When you use or, python sees each side of the operator as separate expressions. The expression x or y == 1 is treated as first a boolean test for x, then if that is False, the expression y == 1 is tested.

This is due to operator precedence. The or operator has a lower precedence than the == test, so the latter is evaluated first.

However, even if this were not the case, and the expression x or y or z == 1 was actually interpreted as (x or y or z) == 1 instead, this would still not do what you expect it to do.

x or y or z would evaluate to the first argument that is ‘truthy’, e.g. not False, numeric 0 or empty (see boolean expressions for details on what Python considers false in a boolean context).

So for the values x = 2; y = 1; z = 0, x or y or z would resolve to 2, because that is the first true-like value in the arguments. Then 2 == 1 would be False, even though y == 1 would be True.

The same would apply to the inverse; testing multiple values against a single variable; x == 1 or 2 or 3 would fail for the same reasons. Use x == 1 or x == 2 or x == 3 or x in {1, 2, 3}.

108) Explain Python’s slice notation?

A) It’s pretty simple really:

a[start:end] # items start through end-1
a[start:] # items start through the rest of the array
a[:end] # items from the beginning through end-1
a[:] # a copy of the whole array
There is also the step value, which can be used with any of the above:

a[start:end:step] # start through not past end, by step
The key point to remember is that the :end value represents the first value that is not in the selected slice. So, the difference beween end and start is the number of elements selected (if step is 1, the default).

The other feature is that start or end may be a negative number, which means it counts from the end of the array instead of the beginning. So:

a[-1] # last item in the array
a[-2:] # last two items in the array
a[:-2] # everything except the last two items

Similarly, step may be a negative number:

a[::-1] # all items in the array, reversed
a[1::-1] # the first two items, reversed
a[:-3:-1] # the last two items, reversed
a[-3::-1] # everything except the last two items, reversed

Python is kind to the programmer if there are fewer items than you ask for. For example, if you ask for a[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen.

109) How to clone or copy a list in Python?

What are the options to clone or copy a list in Python?

Using new_list = my_list then modifies new_list every time my_list changes.
Why is this?

With new_list = my_list, you don’t actually have two lists. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment.

To actually copy the list, you have various possibilities:

You can slice it:

new_list = old_list[:]
Alex Martelli’s opinion (at least back in 2007) about this is, that it is a weird syntax and it does not make sense to use it ever. 😉 (In his opinion, the next one is more readable).

You can use the built in list() function:

new_list = list(old_list)
You can use generic copy.copy():

import copy
new_list = copy.copy(old_list)
This is a little slower than list() because it has to find out the datatype of old_list first.

If the list contains objects and you want to copy them as well, use generic copy.deepcopy():

import copy
new_list = copy.deepcopy(old_list)
Obviously the slowest and most memory-needing method, but sometimes unavoidable.

Example Program:

import copy

class Foo(object):
def __init__(self, val):
self.val = val

def __repr__(self):
return str(self.val)

foo = Foo(1)

a = [‘foo’, foo]
b = a[:]
c = list(a)
d = copy.copy(a)
e = copy.deepcopy(a)

# edit orignal list and instance
a.append(‘baz’)
foo.val = 5

print(‘original: %r\n slice: %r\n list(): %r\n copy: %r\n deepcopy: %r’
% (a, b, c, d, e))

Output:

original: [‘foo’, 5, ‘baz’]
slice: [‘foo’, 5]
list(): [‘foo’, 5]
copy: [‘foo’, 5]
deepcopy: [‘foo’, 1]

Python Interview Questions Experienced

110) List of lists changes reflected across sublists unexpectedly?

I needed to create a list of lists in Python, so I typed the following:

myList = [[1] * 4] * 3
The list looked like this:

[[1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1]]
Then I changed one of the innermost values:

myList[0][0] = 5
Now my list looks like this:

[[5, 1, 1, 1], [5, 1, 1, 1], [5, 1, 1, 1]]
which is not what I wanted or expected. Can someone please explain what’s going on, and how to get around it?

A) When you write [x]*3 you get, essentially, the list [x, x, x]. That is, a list with 3 references to the same x. When you then modify this single x it is visible via all three references to it.

To fix it, you need to make sure that you create a new list at each position. One way to do it is

[[1]*4 for n in range(3)]
which will reevaluate [1]*4 each time instead of evaluating it once and making 3 references to 1 list.

Code:

size = 3
matrix_surprise = [[0] * size] * size
matrix = [[0]*size for i in range(size)]

111) How do I create a variable number of variables?

How do I accomplish variable variables in Python?

Here is an elaborative manual entry, for instance: Variable variables

I have heard this is a bad idea in general though, and it is a security hole in Python. Is that true?

A) You can use dictionaries to accomplish this. Dictionaries are stores of keys and values.

>>> dct = {‘x’: 1, ‘y’: 2, ‘z’: 3}
>>> dct
{‘y’: 2, ‘x’: 1, ‘z’: 3}
>>> dct[“y”]
2
You can use variable key names to achieve the effect of variable variables without the security risk.

>>> x = “spam”
>>> z = {x: “eggs”}
>>> z[“spam”]
‘eggs’
For cases where you’re thinking of doing something like

var1 = ‘foo’
var2 = ‘bar’
var3 = ‘baz’
…
a list may be more appropriate than a dict. A list represents an ordered sequence of objects, with integer indices:

l = [‘foo’, ‘bar’, ‘baz’]
print(l[1]) # prints bar, because indices start at 0
l.append(‘potatoes’) # l is now [‘foo’, ‘bar’, ‘baz’, ‘potatoes’]
For ordered sequences, lists are more convenient than dicts with integer keys, because lists support iteration in index order, slicing, append, and other operations that would require awkward key management with a dict.

112) How do you split a list into evenly sized chunks?

I have a list of arbitrary length, and I need to split it up into equal size chunks and operate on it. There are some obvious ways to do this, like keeping a counter and two lists, and when the second list fills up, add it to the first list and empty the second list for the next round of data, but this is potentially extremely expensive.

I was wondering if anyone had a good solution to this for lists of any length, e.g. using generators.

I was looking for something useful in itertools but I couldn’t find anything obviously useful. Might’ve missed it, though.

A) Here’s a generator that yields the chunks you want:

def chunks(l, n):
“””Yield successive n-sized chunks from l.”””
for i in range(0, len(l), n):
yield l[i:i + n]
import pprint
pprint.pprint(list(chunks(range(10, 75), 10)))
[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
[30, 31, 32, 33, 34, 35, 36, 37, 38, 39],
[40, 41, 42, 43, 44, 45, 46, 47, 48, 49],
[50, 51, 52, 53, 54, 55, 56, 57, 58, 59],
[60, 61, 62, 63, 64, 65, 66, 67, 68, 69],
[70, 71, 72, 73, 74]]

If you’re using Python 2, you should use xrange() instead of range():

def chunks(l, n):
“””Yield successive n-sized chunks from l.”””
for i in xrange(0, len(l), n):
yield l[i:i + n]
Also you can simply use list comprehension instead of writing a function. Python 3:

[l[i:i + n] for i in range(0, len(l), n)]

Python 2 version:

[l[i:i + n] for i in xrange(0, len(l), n)]

If you want something super simple:

def chunks(l, n):
n = max(1, n)
return (l[i:i+n] for i in xrange(0, len(l), n))

Python Developer Interview Questions

113) Making a flat list out of list of lists in Python?

I wonder whether there is a shortcut to make a simple list out of list of lists in Python.

I can do that in a for loop, but maybe there is some cool “one-liner”? I tried it with reduce, but I get an error.

Code:

l = [[1, 2, 3], [4, 5, 6], [7], [8, 9]]
reduce(lambda x, y: x.extend(y), l)

Error message

Traceback (most recent call last):
File “<stdin>”, line 1, in <module>
File “<stdin>”, line 1, in <lambda>
AttributeError: ‘NoneType’ object has no attribute ‘extend’

A) flat_list = [item for sublist in l for item in sublist]
which means:

for sublist in l:
for item in sublist:
flat_list.append(item)

is faster than the shortcuts posted so far. (l is the list to flatten.)

Here is a the corresponding function:

flatten = lambda l: [item for sublist in l for item in sublist]
For evidence, as always, you can use the timeit module in the standard library:

$ python -mtimeit -s’l=[[1,2,3],[4,5,6], [7], [8,9]]*99′ ‘[item for sublist in l for item in sublist]’
10000 loops, best of 3: 143 usec per loop
$ python -mtimeit -s’l=[[1,2,3],[4,5,6], [7], [8,9]]*99′ ‘sum(l, [])’
1000 loops, best of 3: 969 usec per loop
$ python -mtimeit -s’l=[[1,2,3],[4,5,6], [7], [8,9]]*99′ ‘reduce(lambda x,y: x+y,l)’
1000 loops, best of 3: 1.1 msec per loop

Explanation: the shortcuts based on + (including the implied use in sum) are, of necessity, O(L**2) when there are L sublists — as the intermediate result list keeps getting longer, at each step a new intermediate result list object gets allocated, and all the items in the previous intermediate result must be copied over (as well as a few new ones added at the end).

So (for simplicity and without actual loss of generality) say you have L sublists of I items each: the first I items are copied back and forth L-1 times, the second I items L-2 times, and so on; total number of copies is I times the sum of x for x from 1 to L excluded, i.e., I * (L**2)/2.

The list comprehension just generates one list, once, and copies each item over (from its original place of residence to the result list) also exactly once.

114) How to remove items from a list while iterating?

I’m iterating over a list of tuples in Python, and am attempting to remove them if they meet certain criteria.

for tup in somelist:
if determine(tup):
code_to_remove_tup

What should I use in place of code_to_remove_tup? I can’t figure out how to remove the item in this fashion.

A) You can use a list comprehension to create a new list containing only the elements you don’t want to remove:

somelist = [x for x in somelist if not determine(x)]
Or, by assigning to the slice somelist[:], you can mutate the existing list to contain only the items you want:

somelist[:] = [x for x in somelist if not determine(x)]
This approach could be useful if there are other references to somelist that need to reflect the changes.

Instead of a comprehension, you could also use itertools. In Python 2:

from itertools import ifilterfalse
somelist[:] = ifilterfalse(determine, somelist)
Or in Python 3:

from itertools import filterfalse
somelist[:] = filterfalse(determine, somelist)

115) Short Description of the Scoping Rules?

What exactly are the Python scoping rules?

If I have some code:

code1
class Foo:
code2
def spam…..
code3
for code4..:
code5
x()

Where is x found? Some possible choices include the list above:

In the enclosing source file
In the class namespace
In the function definition
In the for loop index variable
Inside the for loop
Also there is the context during execution, when the function spam is passed somewhere else. And maybe lambda functions pass a bit differently?

There must be a simple reference or algorithm somewhere. It’s a confusing world for intermediate Python programmers.

A) Actually, a concise rule for Python Scope resolution, from Learning Python, 3rd. Ed.. (These rules are specific to variable names, not attributes. If you reference it without a period, these rules apply)

LEGB Rule.

L, Local — Names assigned in any way within a function (def or lambda)), and not declared global in that function.

E, Enclosing-function locals — Name in the local scope of any and all statically enclosing functions (def or lambda), from inner to outer.

G, Global (module) — Names assigned at the top-level of a module file, or by executing a global statement in a def within the file.

B, Built-in (Python) — Names preassigned in the built-in names module : open,range,SyntaxError,…

So, in the case of

code1
class Foo:
code2
def spam…..
code3
for code4..:
code5
x()
The for loop does not have its own namespace. In LEGB order, the scopes would be

L : local, in def spam (in code3, code 4, code5).

E : Enclosed function, any enclosing functions (if the whole example were in another def)

G : Global. Were there any x declared globally in the module (code1)?

B : Any builtin x in Python.

x will never be found in code2 (even in cases where you might expect it would)

Python Developer Interview Questions And Answers

116) What does ** (double star/asterisk) and * (star/asterisk) do for parameters?

In the following method definitions, what does the * and ** do for param2?

def foo(param1, *param2):
def bar(param1, **param2):

A) The *args and **kwargs is a common idiom to allow arbitrary number of arguments to functions as described in the section more on defining functions in the Python documentation.

The *args will give you all function parameters as a tuple:

In [1]: def foo(*args):
…: for a in args:
…: print a
…:
…:

In [2]: foo(1)
1

In [4]: foo(1,2,3)
1
2
3

The **kwargs will give you all keyword arguments except for those corresponding to a formal parameter as a dictionary.

In [5]: def bar(**kwargs):
…: for a in kwargs:
…: print a, kwargs[a]
…:
…:

In [6]: bar(name=’one’, age=27)
age 27
name one

Both idioms can be mixed with normal arguments to allow a set of fixed and some variable arguments:

def foo(kind, *args, **kwargs):
pass
Another usage of the *l idiom is to unpack argument lists when calling a function.

In [9]: def foo(bar, lee):
…: print bar, lee
…:
…:

In [10]: l = [1,2]

In [11]: foo(*l)
1 2

In Python 3 it is possible to use *l on the left side of an assignment (Extended Iterable Unpacking), though it gives a list instead of a tuple in this context:

first, *rest = [1,2,3,4]
first, *l, last = [1,2,3,4]

Also Python 3 adds new semantic (refer PEP 3102):

def func(arg1, arg2, arg3, *, kwarg1, kwarg2):
pass
Such function accepts only 3 positional arguments, and everything after * can only be passed as keyword arguments.

117) Calling an external command in Python?

How can I call an external command (as if I’d typed it at the Unix shell or Windows command prompt) from within a Python script?

A) Look at the subprocess module in the standard library:

from subprocess import call
call([“ls”, “-l”])
The advantage of subprocess vs system is that it is more flexible (you can get the stdout, stderr, the “real” status code, better error handling, etc…).

118) What does if __name__ == “__main__”: do?

# Threading example
import time, thread

def myfunction(string, sleeptime, lock, *args):
while True:
lock.acquire()
time.sleep(sleeptime)
lock.release()
time.sleep(sleeptime)

if __name__ == “__main__”:
lock = thread.allocate_lock()
thread.start_new_thread(myfunction, (“Thread #: 1”, 2, lock))
thread.start_new_thread(myfunction, (“Thread #: 2”, 2, lock))

A) When the Python interpreter reads a source file, it executes all of the code found in it.

Before executing the code, it will define a few special variables. For example, if the python interpreter is running that module (the source file) as the main program, it sets the special __name__ variable to have a value “__main__”. If this file is being imported from another module, __name__ will be set to the module’s name.

In the case of your script, let’s assume that it’s executing as the main function, e.g. you said something like

python threading_example.py

on the command line. After setting up the special variables, it will execute the import statement and load those modules. It will then evaluate the def block, creating a function object and creating a variable called myfunction that points to the function object. It will then read the if statement and see that __name__ does equal “__main__”, so it will execute the block shown there.

One reason for doing this is that sometimes you write a module (a .py file) where it can be executed directly. Alternatively, it can also be imported and used in another module. By doing the main check, you can have that code only execute when you want to run the module as a program and not have it execute when someone just wants to import your module and call your functions themselves.

119) Using global variables in a function other than the one that created them.

If I create a global variable in one function, how can I use that variable in another function?

Do I need to store the global variable in a local variable of the function which needs its access?

A) You can use a global variable in other functions by declaring it as global in each function that assigns to it:

globvar = 0

def set_globvar_to_one():
global globvar # Needed to modify global copy of globvar
globvar = 1

def print_globvar():
print(globvar) # No need for global declaration to read value of globvar

set_globvar_to_one()
print_globvar() # Prints 1
I imagine the reason for it is that, since global variables are so dangerous, Python wants to make sure that you really know that’s what you’re playing with by explicitly requiring the global keyword.

See other answers if you want to share a global variable across modules.

120) How do I sort a dictionary by value?

I have a dictionary of values read from two fields in a database: a string field and a numeric field. The string field is unique, so that is the key of the dictionary.

I can sort on the keys, but how can I sort based on the values?

A) It is not possible to sort a dictionary, only to get a representation of a dictionary that is sorted. Dictionaries are inherently orderless, but other types, such as lists and tuples, are not. So you need an ordered data type to represent sorted values, which will be a list—probably a list of tuples.

For instance,

import operator
x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}
sorted_x = sorted(x.items(), key=operator.itemgetter(1))
sorted_x will be a list of tuples sorted by the second element in each tuple. dict(sorted_x) == x.

And for those wishing to sort on keys instead of values:

import operator
x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}
sorted_x = sorted(x.items(), key=operator.itemgetter(0))

Python Developer Interview Questions For Experienced

121) Flatten an irregular list of lists

L = [[[1, 2, 3], [4, 5]], 6]
Where the desired output is

[1, 2, 3, 4, 5, 6]
Or perhaps even better, an iterator.

def flatten(x):
result = []
for el in x:
if hasattr(el, “__iter__”) and not isinstance(el, basestring):
result.extend(flatten(el))
else:
result.append(el)
return result

flatten(L)
Is this the best model? Did I overlook something? Any problems?

A) Using generator functions can make your example a little easier to read and probably boost the performance.

Python 2
def flatten(l):
for el in l:
if isinstance(el, collections.Iterable) and not isinstance(el, basestring):
for sub in flatten(el):
yield sub
else:
yield el
I used the Iterable ABC added in 2.6.

Python 3
In Python 3, the basestring is no more, but you can use a tuple of str and bytes to get the same effect there.

The yield from operator returns an item from a generator one at a time. This syntax for delegating to a subgenerator was added in 3.3

def flatten(l):
for el in l:
if isinstance(el, collections.Iterable) and not isinstance(el, (str, bytes)):
yield from flatten(el)
else:
yield el

122) What are metaclasses and what do we use them for?

A) A metaclass is the class of a class. Like a class defines how an instance of the class behaves, a metaclass defines how a class behaves. A class is an instance of a metaclass.

While in Python you can use arbitrary callables for metaclasses (like Jerub shows), the more useful approach is actually to make it an actual class itself. type is the usual metaclass in Python. In case you’re wondering, yes, type is itself a class, and it is its own type. You won’t be able to recreate something like type purely in Python, but Python cheats a little. To create your own metaclass in Python you really just want to subclass type.

A metaclass is most commonly used as a class-factory. Like you create an instance of the class by calling the class, Python creates a new class (when it executes the ‘class’ statement) by calling the metaclass. Combined with the normal __init__ and __new__ methods, metaclasses therefore allow you to do ‘extra things’ when creating a class, like registering the new class with some registry, or even replace the class with something else entirely.

When the class statement is executed, Python first executes the body of the class statement as a normal block of code. The resulting namespace (a dict) holds the attributes of the class-to-be. The metaclass is determined by looking at the baseclasses of the class-to-be (metaclasses are inherited), at the __metaclass__ attribute of the class-to-be (if any) or the __metaclass__ global variable. The metaclass is then called with the name, bases and attributes of the class to instantiate it.

However, metaclasses actually define the type of a class, not just a factory for it, so you can do much more with them. You can, for instance, define normal methods on the metaclass.

These metaclass-methods are like classmethods, in that they can be called on the class without an instance, but they are also not like classmethods in that they cannot be called on an instance of the class. type.__subclasses__() is an example of a method on the type metaclass. You can also define the normal ‘magic’ methods, like __add__, __iter__ and __getattr__, to implement or change how the class behaves.

Here’s an aggregated example of the bits and pieces:

def make_hook(f):
“””Decorator to turn ‘foo’ method into ‘__foo__'”””
f.is_hook = 1
return f

class MyType(type):
def __new__(mcls, name, bases, attrs):

if name.startswith(‘None’):
return None

# Go over attributes and see if they should be renamed.
newattrs = {}
for attrname, attrvalue in attrs.iteritems():
if getattr(attrvalue, ‘is_hook’, 0):
newattrs[‘__%s__’ % attrname] = attrvalue
else:
newattrs[attrname] = attrvalue

return super(MyType, mcls).__new__(mcls, name, bases, newattrs)

def __init__(self, name, bases, attrs):
super(MyType, self).__init__(name, bases, attrs)

# classregistry.register(self, self.interfaces)
print “Would register class %s now.” % self

def __add__(self, other):
class AutoClass(self, other):
pass
return AutoClass
# Alternatively, to autogenerate the classname as well as the class:
# return type(self.__name__ + other.__name__, (self, other), {})

def unregister(self):
# classregistry.unregister(self)
print “Would unregister class %s now.” % self

class MyObject:
__metaclass__ = MyType

class NoneSample(MyObject):
pass

# Will print “NoneType None”
print type(NoneSample), repr(NoneSample)

class Example(MyObject):
def __init__(self, value):
self.value = value
@make_hook
def add(self, other):
return self.__class__(self.value + other.value)

# Will unregister the class
Example.unregister()

inst = Example(10)
# Will fail with an AttributeError
#inst.unregister()

print inst + inst
class Sibling(MyObject):
pass

ExampleSibling = Example + Sibling
# ExampleSibling is now a subclass of both Example and Sibling (with no
# content of its own) although it will believe it’s called ‘AutoClass’
print ExampleSibling
print ExampleSibling.__mro__

Python Experience Interview Questions

123) Why does the following behave unexpectedly in Python?

>>> a = 256
>>> b = 256
>>> a is b
True # This is an expected result
>>> a = 257
>>> b = 257
>>> a is b
False # What happened here? Why is this False?
>>> 257 is 257
True # Yet the literal numbers compare properly
I am using Python 2.5.2. Trying some different versions of Python, it appears that Python 2.3.3 shows the above behaviour between 99 and 100.

Based on the above, I can hypothesize that Python is internally implemented such that “small” integers are stored in a different way than larger integers and the is operator can tell the difference. Why the leaky abstraction? What is a better way of comparing two arbitrary objects to see whether they are the same when I don’t know in advance whether they are numbers or not?

A) Take a look at this:

>>> a = 256
>>> b = 256
>>> id(a)
9987148
>>> id(b)
9987148
>>> a = 257
>>> b = 257
>>> id(a)
11662816
>>> id(b)
11662828

124) Why do I receive a syntax error when printing a string in Python 3?

>>> print “hello World”
File “<stdin>”, line 1
print “hello World”
^
SyntaxError: invalid syntax

A) In Python 3, print became a function. This means that you need to include parenthesis now like mentioned below:

print(“Hello World”)

125) Does Python have a ternary conditional operator?

If Python does not have a ternary conditional operator, is it possible to simulate one using other language constructs?

A) Yes, it was added in version 2.5.
The syntax is:

a if condition else b
First condition is evaluated, then either a or b is returned based on the Boolean value of condition
If condition evaluates to True a is returned, else b is returned.

For example:

>>> ‘true’ if True else ‘false’
‘true’
>>> ‘true’ if False else ‘false’
‘false’

Note that conditionals are an expression, not a statement. This means you can’t use assignments or pass or other statements in a conditional:

>>> pass if False else x = 3
File “<stdin>”, line 1
pass if False else x = 3
^
SyntaxError: invalid syntax

In such a case, you have to use a normal if statement instead of a conditional.

126) How to avoid having class data shared among instances?

What I want is this behavior:

class a:
list = []

x = a()
y = a()

x.list.append(1)
y.list.append(2)
x.list.append(3)
y.list.append(4)

print(x.list) # prints [1, 3]
print(y.list) # prints [2, 4]
Of course, what really happens when I print is:

print(x.list) # prints [1, 2, 3, 4]
print(y.list) # prints [1, 2, 3, 4]

Clearly they are sharing the data in class a. How do I get separate instances to achieve the behavior I desire?

A) You want this:

class a:
def __init__(self):
self.list = []

Declaring the variables inside the class declaration makes them “class” members and not instance members. Declaring them inside the __init__ method makes sure that a new instance of the members is created alongside every new instance of the object, which is the behavior you’re looking for.

Python Programming Interview Questions

127) How to make a chain of function decorators?

How can I make two decorators in Python that would do the following?

@makebold
@makeitalic
def say():
return “Hello”
…which should return:

“Hello”
I’m not trying to make HTML this way in a real application – just trying to understand how decorators and decorator chaining works.

A) Here is what you asked for:

def makebold(fn):
def wrapped():
return “” + fn() + “”
return wrapped

def makeitalic(fn):
def wrapped():
return “” + fn() + “”
return wrapped

@makebold
@makeitalic
def hello():
return “hello world”

print hello() ## returns “hello world”

128) Is there any way to kill a Thread in Python?

Is it possible to terminate a running thread without setting/checking any flags/semaphores/etc.?

A) There is no official API to do that, no.

You need to use platform API to kill the thread, e.g. pthread_kill, or TerminateThread. You can access such API e.g. through pythonwin, or through ctypes.

Notice that this is inherently unsafe. It will likely lead to uncollectable garbage (from local variables of the stack frames that become garbage), and may lead to deadlocks, if the thread being killed has the GIL at the point when it is killed.

129) Difference between __str__ and __repr__?

What is the difference between __str__ and __repr__ in Python?

A) My rule of thumb: __repr__ is for developers, __str__ is for customers.

130) Why is Button parameter “command” executed when declared?

My code is:

from Tkinter import *

admin = Tk()
def button(an):
print an
print ‘het’

b = Button(admin, text=’as’, command=button(‘hey’))
b.pack()
mainloop()

The button doesn’t work, it prints ‘hey’ and ‘het’ once without my command, and then, when I press the button nothing happens.

A) You need to create a function without parameters that you can use as the command:

b = Button(admin, text=’as’, command=lambda: button(‘hey’))

Advanced Python Programming Interview Questions

131) Why is using ‘eval’ a bad practice?

I am using the following class to easily store data of my songs.

class Song:
“””The class to store the details of each song”””
attsToStore=(‘Name’, ‘Artist’, ‘Album’, ‘Genre’, ‘Location’)
def __init__(self):
for att in self.attsToStore:
exec ‘self.%s=None’%(att.lower()) in locals()
def setDetail(self, key, val):
if key in self.attsToStore:
exec ‘self.%s=val’%(key.lower()) in locals()

I feel that this is just much more extensible than writing out an if/else block. However, eval seems to be considered a bad practice and unsafe to use. If so, can anyone explain to me why and show me a better way of defining the above class?

A) Yes, using eval is a bad practice. Just to name a few reasons:

There is almost always a better way to do it
Very dangerous and insecure
Makes debugging difficult
Slow
In your case you can use setattr instead:

class Song:
“””The class to store the details of each song”””
attsToStore=(‘Name’, ‘Artist’, ‘Album’, ‘Genre’, ‘Location’)
def __init__(self):
for att in self.attsToStore:
setattr(self, att.lower(), None)
def setDetail(self, key, val):
if key in self.attsToStore:
setattr(self, key.lower(), val)

There are some cases where you have to use eval or exec. But they are rare. Using eval in your case is a bad practice for sure. I’m emphasizing on bad practice because eval and exec are frequently used in the wrong place.

It looks like some disagree that eval is ‘very dangerous and insecure’ in the OP case. That might be true for this specific case but not in general. The question was general and the reasons I listed are true for the general case as well.

132) What is the purpose of self?

What is the purpose of the self word in Python? I understand it refers to the specific object created from that class, but I can’t see why it explicitly needs to be added to every function as a parameter. To illustrate, in Ruby I can do this:

class myClass
def myFunc(name)
@name = name
end
end

Which I understand, quite easily. However in Python I need to include self:

class myClass:
def myFunc(self, name):
self.name = name

Can anyone talk me through this? It is not something I’ve come across in my (admittedly limited) experience.

A) The reason you need to use self. is because Python does not use the @ syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is called on.

That makes methods entirely the same as functions, and leaves the actual name to use up to you (although self is the convention, and people will generally frown at you when you use something else.) self is not special to the code, it’s just another object.

Python could have done something else to distinguish normal names from attributes — special syntax like Ruby has, or requiring declarations like C++ and Java do, or perhaps something yet more different — but it didn’t. Python’s all for making things explicit, making it obvious what’s what, and although it doesn’t do it entirely everywhere, it does do it for instance attributes. That’s why assigning to an instance attribute needs to know what instance to assign to, and that’s why it needs self.

133) How do you remove duplicates from a list whilst preserving order?

Is there a built-in that removes duplicates from list in Python, whilst preserving order? I know that I can use a set to remove duplicates, but that destroys the original order. I also know that I can roll my own like this:

def uniq(input):
output = []
for x in input:
if x not in output:
output.append(x)
return output

A) Fastest one:

def f7(seq):
seen = set()
seen_add = seen.add
return [x for x in seq if not (x in seen or seen_add(x))]

Why assign seen.add to seen_add instead of just calling seen.add? Python is a dynamic language, and resolving seen.add each iteration is more costly than resolving a local variable. seen.add could have changed between iterations, and the runtime isn’t smart enough to rule that out. To play it safe, it has to check the object each time.

134) What is the meaning of a single- and a double-underscore before an object name?

I want to clear this up once and for all. Can someone please explain the exact meaning of having leading underscores before an object’s name in Python? Also explain the difference between a single and a double leading underscore. Also, does that meaning stay the same whether the object in question is a variable, a function, a method, etc?

A) Single Underscore – Names, in a class, with a leading underscore are simply to indicate to other programmers that the attribute or method is intended to be private. However, nothing special is done with the name itself.

Double Underscore (Name Mangling) – Any identifier of the form __spam (at least two leading underscores, at most one trailing underscore) is textually replaced with _classname__spam, where classname is the current class name with leading underscore(s) stripped. This mangling is done without regard to the syntactic position of the identifier, so it can be used to define class-private instance and class variables, methods, variables stored in globals, and even variables stored in instances. private to this class on instances of other classes.

Example:

>>> class MyClass():
… def __init__(self):
… self.__superprivate = “Hello”
… self._semiprivate = “, world!”
…
>>> mc = MyClass()
>>> print mc.__superprivate
Traceback (most recent call last):
File “<stdin>”, line 1, in <module>
AttributeError: myClass instance has no attribute ‘__superprivate’
>>> print mc._semiprivate
, world!
>>> print mc.__dict__
{‘_MyClass__superprivate’: ‘Hello’, ‘_semiprivate’: ‘, world!’}

Python Programming Interview Questions And Answers

135) Converting string into datetime

Short and simple. I’ve got a huge list of date-times like this as strings:

Jun 1 2005 1:33PM
Aug 28 1999 12:00AM

I’m going to be shoving these back into proper datetime fields in a database so I need to magic them into real datetime objects.

Any help (even if it’s just a kick in the right direction) would be appreciated.

A) datetime.strptime is the main routine for parsing strings into datetimes. It can handle all sorts of formats, with the format determined by a format string you give it:

from datetime import datetime

datetime_object = datetime.strptime(‘Jun 1 2005 1:33PM’, ‘%b %d %Y %I:%M%p’)

The resulting datetime object is timezone-naive.

Links:

Python documentation for strptime: Python 2, Python 3

Python documentation for strptime/strftime format strings: Python 2, Python 3

strftime.org is also a really nice reference for strftime

Notes:

strptime = “string parse time”
strftime = “string format time”
Pronounce it out loud today & you won’t have to search for it again in 6 months.

136) Why does comparing strings in Python using either ‘==’ or ‘is’ sometimes produce a different result?

I’ve got a Python program where two variables are set to the value ‘public’. In a conditional expression I have the comparison var1 is var2 which fails, but if I change it to var1 == var2 it returns True.

Now if I open my Python interpreter and do the same “is” comparison, it succeeds.

>>> s1 = ‘public’
>>> s2 = ‘public’
>>> s2 is s1
True
What am I missing here?

A) is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this:

>>> a = ‘pub’
>>> b = ”.join([‘p’, ‘u’, ‘b’])
>>> a == b
True
>>> a is b
False
so, no wonder they’re not the same, right?

In other words: is is the id(a) == id(b)

137) How to iterate through two lists in parallel?

I have two iterables in Python, and I want to go over them in pairs:

foo = (1, 2, 3)
bar = (4, 5, 6)

for (f, b) in some_iterator(foo, bar):
print “f: “, f, “; b: “, b

It should result in:

f: 1; b: 4
f: 2; b: 5
f: 3; b: 6
One way to do it is to iterate over the indices:

for i in xrange(len(foo)):
print “f: “, foo[i], “; b: “, b[i]

But that seems somewhat unpythonic to me. Is there a better way to do it?

A) for f, b in zip(foo, bar):
print(f, b)
zip stops when the shorter of foo or bar stops.

In Python 2, zip returns a list of tuples. This is fine when foo and bar are not massive. If they are both massive then forming zip(foo,bar) is an unnecessarily massive temporary variable, and should be replaced by itertools.izip or itertools.izip_longest, which returns an iterator instead of a list.

import itertools
for f,b in itertools.izip(foo,bar):
print(f,b)
for f,b in itertools.izip_longest(foo,bar):
print(f,b)
izip stops when either foo or bar is exhausted. izip_longest stops when both foo and bar are exhausted. When the shorter iterator(s) are exhausted, izip_longest yields a tuple with None in the position corresponding to that iterator. You can also set a different fillvalue besides None if you wish. See here for the full story.

In Python 3, zip returns an iterator of tuples, like itertools.izip in Python2. To get a list of tuples, use list(zip(foo, bar)). And to zip until both iterators are exhausted, you would use itertools.zip_longest.

Note also that zip and its zip-like brethen can accept an arbitrary number of iterables as arguments. For example,

for num, cheese, color in zip([1,2,3], [‘manchego’, ‘stilton’, ‘brie’],
[‘red’, ‘blue’, ‘green’]):
print(‘{} {} {}’.format(num, color, cheese))

prints

1 red manchego
2 blue stilton
3 green brie

Python Scripting Interview Questions

138) How to merge two dictionaries in a single expression?

A) I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, merged. The update() method would be what I need, if it returned its result instead of modifying a dict in-place.

>>> x = {‘a’:1, ‘b’: 2}
>>> y = {‘b’:10, ‘c’: 11}
>>> z = x.update(y)
>>> print(z)
None
>>> x
{‘a’: 1, ‘b’: 10, ‘c’: 11}

How can I get that final merged dict in z, not x?

(To be extra-clear, the last-one-wins conflict-handling of dict.update() is what I’m looking for as well.)

A) For dictionaries x and y, z becomes a merged dictionary with values from y replacing those from x.

In Python 3.5 or greater, :

z = {**x, **y}
In Python 2, (or 3.4 or lower) write a function:

def merge_two_dicts(x, y):
z = x.copy() # start with x’s keys and values
z.update(y) # modifies z with y’s keys and values & returns None
return z
and

z = merge_two_dicts(x, y)

Explanation:

Say you have two dicts and you want to merge them into a new dict without altering the original dicts:

x = {‘a’: 1, ‘b’: 2}
y = {‘b’: 3, ‘c’: 4}

The desired result is to get a new dictionary (z) with the values merged, and the second dict’s values overwriting those from the first.

>>> z
{‘a’: 1, ‘b’: 3, ‘c’: 4}

A new syntax for this, proposed in PEP 448 and available as of Python 3.5, is

z = {**x, **y}

And it is indeed a single expression. It is now showing as implemented in the release schedule for 3.5, PEP 478, and it has now made its way into What’s New in Python 3.5 document.

However, since many organizations are still on Python 2, you may wish to do this in a backwards compatible way. The classically Pythonic way, available in Python 2 and Python 3.0-3.4, is to do this as a two-step process:

z = x.copy()
z.update(y) # which returns None since it mutates z
In both approaches, y will come second and its values will replace x’s values, thus ‘b’ will point to 3 in our final result.

139) In Python, how do I read a file line-by-line into a list?

How do I read every line of a file in Python and store each line as an element in a list?

I want to read the file line by line and append each line to the end of the list.

A) with open(fname) as f:
content = f.readlines()
# you may also want to remove whitespace characters like `\n` at the end of each line
content = [x.strip() for x in content]

I’m guessing that you meant list and not array.

Python Scripting Interview Questions And Answers

140) How to print without newline or space?

I’d like to do it in python. What I’d like to do in this example in c:

#include <stdio.h>

int main() {
int i;
for (i=0; i<10; i++) printf(“.”);
return 0;
}
Output:

……….
In Python:

>>> for i in xrange(0,10): print ‘.’
.
.
.
.
.
.
.
.
.
.
>>> for i in xrange(0,10): print ‘.’,
. . . . . . . . . .
In Python print will add a \n or a space, how can I avoid that? Now, it’s just an example. Don’t tell me I can first build a string then print it. I’d like to know how to “append” strings to stdout.

A) General way

import sys
sys.stdout.write(‘.’)
You may also need to call

sys.stdout.flush()
to ensure stdout is flushed immediately.

Python 2.6+

From Python 2.6 you can import the print function from Python 3:

from __future__ import print_function
This allows you to use the Python 3 solution below.

Python 3

In Python 3, the print statement has been changed into a function. In Python 3, you can instead do:

print(‘.’, end=”)
This also works in Python 2, provided that you’ve used from __future__ import print_function.

If you are having trouble with buffering, you can flush the output by adding flush=True keyword argument:

print(‘.’, end=”, flush=True)

141) Get the cartesian product of a series of lists?

How can I get the Cartesian product (every possible combination of values) from a group of lists?

Input:

somelists = [
[1, 2, 3],
[‘a’, ‘b’],
[4, 5]
]
Desired output:

[(1, ‘a’, 4), (1, ‘a’, 5), (1, ‘b’, 4), (1, ‘b’, 5), (2, ‘a’, 4), (2, ‘a’, 5) …]

A) In Python 2.6+

import itertools
for element in itertools.product(*somelists):
print(element)

142) Does Python have a built in function for string natural sort?

Using Python 3.x, I have a list of strings for which I would like to perform a natural alphabetical sort.

Natural sort: The order by which files in Windows are sorted.

For instance, the following list is naturally sorted (what I want):

[‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]

And here’s the “sorted” version of the above list (what I have):

[‘Elm11’, ‘Elm12’, ‘Elm2’, ‘elm0’, ‘elm1’, ‘elm10’, ‘elm13’, ‘elm9’]

I’m looking for a sort function which behaves like the first one.

A) There is a third party library for this on PyPI called natsort (full disclosure, I am the package’s author). For your case, you can do either of the following:

>>> from natsort import natsorted, ns
>>> x = [‘Elm11’, ‘Elm12’, ‘Elm2’, ‘elm0’, ‘elm1’, ‘elm10’, ‘elm13’, ‘elm9’]
>>> natsorted(x, key=lambda y: y.lower())
[‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]
>>> natsorted(x, alg=ns.IGNORECASE) # or alg=ns.IC
[‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]
You should note that natsort uses a general algorithm so it should work for just about any input that you throw at it. If you want more details on why you might choose a library to do this rather than rolling your own function, check out the natsort documentation’s How It Works page, in particular the Special Cases Everywhere! section.

If you need a sorting key instead of a sorting function, use either of the below formulas.

>>> from natsort import natsort_keygen, ns
>>> l1 = [‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]
>>> l2 = l1[:]
>>> natsort_key1 = natsort_keygen(key=lambda y: y.lower())
>>> l1.sort(key=natsort_key1)
>>> l1
[‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]
>>> natsort_key2 = natsort_keygen(alg=ns.IGNORECASE)
>>> l2.sort(key=natsort_key2)
>>> l2
[‘elm0’, ‘elm1’, ‘Elm2’, ‘elm9’, ‘elm10’, ‘Elm11’, ‘Elm12’, ‘elm13’]

Python Coding Interview Questions

143) Convert a string representation of list to list.

I was wondering what the simplest way is to convert a string list like the following to a list:

x = u'[ “A”,”B”,”C” , ” D”]’

Even in case user puts spaces in between the commas, and spaces inside of the quotes. I need to handle that as well to:

x = [“A”, “B”, “C”, “D”]

in Python.

I know I can strip spaces with strip() and split() using the split operator and check for non alphabets. But the code was getting very kludgy. Is there a quick function that I’m not aware of?

A) >>> import ast
>>> x = u'[ “A”,”B”,”C” , ” D”]’
>>> x = ast.literal_eval(x)
>>> x
[‘A’, ‘B’, ‘C’, ‘ D’]
>>> x = [n.strip() for n in x]
>>> x
[‘A’, ‘B’, ‘C’, ‘D’]

ast.literal_eval:

With ast.literal_eval, you can safely evaluate an expression node or a string containing a Python expression. The string or node provided may only consist of the following Python literal structures: strings, numbers, tuples, lists, dicts, booleans, and None.

144) How to import a module given the full path?

How can I load a Python module given its full path? Note that the file can be anywhere in the filesystem, as it is a configuration option.

A) For Python 3.5+ use:

import importlib.util
spec = importlib.util.spec_from_file_location(“module.name”, “/path/to/file.py”)
foo = importlib.util.module_from_spec(spec)
spec.loader.exec_module(foo)
foo.MyClass()

For Python 3.3 and 3.4 use:

from importlib.machinery import SourceFileLoader

foo = SourceFileLoader(“module.name”, “/path/to/file.py”).load_module()
foo.MyClass()

(Although this has been deprecated in Python 3.4.)

Python 2 use:

import imp

foo = imp.load_source(‘module.name’, ‘/path/to/file.py’)
foo.MyClass()

There are equivalent convenience functions for compiled Python files and DLLs.

145) Is there a difference between `==` and `is` in Python?

A) In Python, are the following two tests for equality equivalent?

n = 5
# Test one.
if n == 5:
print ‘Yay!’

# Test two.
if n is 5:
print ‘Yay!’
Does this hold true for objects where you would be comparing instances (a list say)?

Okay, so this kind of answers my question:

L = []
L.append(1)
if L == [1]:
print ‘Yay!’
# Holds true, but…

if L is [1]:
print ‘Yay!’
# Doesn’t.

So == tests value where is tests to see if they are the same object?

A) is will return True if two variables point to the same object, == if the objects referred to by the variables are equal.

>>> a = [1, 2, 3]
>>> b = a
>>> b is a
True
>>> b == a
True
>>> b = a[:]
>>> b is a
False
>>> b == a
True

In your case, the second test only works because Python caches small integer objects, which is an implementation detail. For larger integers, this does not work:

>>> 1000 is 10**3
False
>>> 1000 == 10**3
True
The same holds true for string literals:

>>> “a” is “a”
True
>>> “aa” is “a” * 2
True
>>> x = “a”
>>> “aa” is x * 2
False
>>> “aa” is intern(x*2)
True

Python Coding Interview Questions And Answers

146) What’s the difference between raw_input() and input() in python3.x?

What is the difference between raw_input() and input() in python3.x ?

A) The difference is that raw_input() does not exist in Python 3.x, while input() does. Actually, the old raw_input() has been renamed to input(), and the old input() is gone, but can easily be simulated by using eval(input()). (Remember that eval() is evil, so if try to use safer ways of parsing your input if possible.)

147) What is the difference between old style and new style classes in Python?

What is the difference between old style and new style classes in Python? Is there ever a reason to use old-style classes these days?

A) Up to Python 2.1, old-style classes were the only flavour available to the user. The concept of (old-style) class is unrelated to the concept of type: if x is an instance of an old-style class, then x.__class__ designates the class of x, but type(x) is always <type ‘instance’>. This reflects the fact that all old-style instances, independently of their class, are implemented with a single built-in type, called instance.

New-style classes were introduced in Python 2.2 to unify the concepts of class and type. A new-style class is simply a user-defined type, no more, no less. If x is an instance of a new-style class, then type(x) is typically the same as x.__class__ (although this is not guaranteed – a new-style class instance is permitted to override the value returned for x.__class__).

The major motivation for introducing new-style classes is to provide a unified object model with a full meta-model. It also has a number of immediate benefits, like the ability to subclass most built-in types, or the introduction of “descriptors”, which enable computed properties.

For compatibility reasons, classes are still old-style by default. New-style classes are created by specifying another new-style class (i.e. a type) as a parent class, or the “top-level type” object if no other parent is needed. The behaviour of new-style classes differs from that of old-style classes in a number of important details in addition to what type returns.

Some of these changes are fundamental to the new object model, like the way special methods are invoked. Others are “fixes” that could not be implemented before for compatibility concerns, like the method resolution order in case of multiple inheritance.

Python 3 only has new-style classes. No matter if you subclass from object or not, classes are new-style in Python 3.

148) Understanding Python super() with __init__() methods?

I’m trying to understand the use of super(). From the looks of it, both child classes can be created, just fine.

I’m curious to know about the actual difference between the following 2 child classes.

class Base(object):
def __init__(self):
print “Base created”

class ChildA(Base):
def __init__(self):
Base.__init__(self)

class ChildB(Base):
def __init__(self):
super(ChildB, self).__init__()

ChildA()
ChildB()

A) super() lets you avoid referring to the base class explicitly, which can be nice. But the main advantage comes with multiple inheritance, where all sorts of fun stuff can happen. See the standard docs on super if you haven’t already.

Note that the syntax changed in Python 3.0: you can just say super().__init__() instead of super(ChildB, self).__init__() which IMO is quite a bit nicer.

149) How do you append to a file?

How do you append to the file instead of overwriting it? Is there a special function that appends to the file?

A) with open(“test.txt”, “a”) as myfile:
myfile.write(“appended text”)

150) How to count the occurrences of a list item?

Given an item, how can I count its occurrences in a list in Python?

A) If you only want one item’s count, use the count method:

>>> [1, 2, 3, 4, 1, 4, 1].count(1)
3

Don’t use this if you want to count multiple items. Calling count in a loop requires a separate pass over the list for every count call, which can be catastrophic for performance. If you want to count all items, or even just multiple items, use Counter, as explained in the other answers.

Python Programming Questions

151) Python variable scope error.

The following code works as expected in both Python 2.5 and 3.0:

a, b, c = (1, 2, 3)

print(a, b, c)

def test():
print(a)
print(b)
print(c) # (A)
#c+=1 # (B)
test()

However, when I uncomment line (B), I get an UnboundLocalError: ‘c’ not assigned at line (A). The values of a and b are printed correctly. This has me completely baffled for two reasons:

Why is there a runtime error thrown at line (A) because of a later statement on line (B)?

Why are variables a and b printed as expected, while c raises an error?

The only explanation I can come up with is that a local variable c is created by the assignment c+=1, which takes precedent over the “global” variable c even before the local variable is created. Of course, it doesn’t make sense for a variable to “steal” scope before it exists.

Could someone please explain this behavior?

A) Python treats variables in functions differently depending on whether you assign values to them from within the function or not. If a function contains any assignments to a variable, it is treated by default as a local variable. Therefore, when you uncomment the line, you are trying to reference a local variable before any value has been assigned to it.

If you want the variable c to refer to the global c put

global c

as the first line of the function.

As for python 3, there is now

nonlocal c

that you can use to refer to the nearest enclosing function scope that has a c variable.

152) Python List Comprehension Vs. Map

Is there a reason to prefer using map() over list comprehension or vice versa? Is either of them generally more efficient or considered generally more pythonic than the other?

A) map may be microscopically faster in some cases (when you’re NOT making a lambda for the purpose, but using the same function in map and a listcomp). List comprehensions may be faster in other cases and most (not all) pythonistas consider them more direct and clearer.

An example of the tiny speed advantage of map when using exactly the same function:

$ python -mtimeit -s’xs=range(10)’ ‘map(hex, xs)’
100000 loops, best of 3: 4.86 usec per loop
$ python -mtimeit -s’xs=range(10)’ ‘[hex(x) for x in xs]’
100000 loops, best of 3: 5.58 usec per loop
An example of how performance comparison gets completely reversed when map needs a lambda:

$ python -mtimeit -s’xs=range(10)’ ‘map(lambda x: x+2, xs)’
100000 loops, best of 3: 4.24 usec per loop
$ python -mtimeit -s’xs=range(10)’ ‘[x+2 for x in xs]’
100000 loops, best of 3: 2.32 usec per loop

Python3 Interview Questions And Answers

153) UnboundLocalError in Python

What am I doing wrong here?

counter = 0

def increment():
counter += 1

increment()
The above code throws a UnboundLocalError.

A) Python doesn’t have variable declarations, so it has to figure out the scope of variables itself. It does so by a simple rule: If there is an assignment to a variable inside a function, that variable is considered local.[1] Thus, the line

counter += 1

implicitly makes counter local to increment(). Trying to execute this line, though, will try to read the value of the local variable counter before it is assigned, resulting in an UnboundLocalError.[2]

If counter is a global variable, the global keyword will help. If increment() is a local function and counter a local variable, you can use nonlocal in Python 3.x.

154) What is the difference between re.search and re.match?

What is the difference between the search() and match() functions in the Python re module?

A) re.match is anchored at the beginning of the string. That has nothing to do with newlines, so it is not the same as using ^ in the pattern.

If zero or more characters at the beginning of string match the regular expression pattern, return a corresponding MatchObject instance. Return None if the string does not match the pattern; note that this is different from a zero-length match.

Note: If you want to locate a match anywhere in string, use search() instead.

Scan through string looking for a location where the regular expression pattern produces a match, and return a corresponding MatchObject instance. Return None if no position in the string matches the pattern; note that this is different from finding a zero-length match at some point in the string.

So if you need to match at the beginning of the string, or to match the entire string use match. It is faster. Otherwise use search.

The documentation has a specific section for match vs. search that also covers multiline strings:

Python offers two different primitive operations based on regular expressions: match checks for a match only at the beginning of the string, while search checks for a match anywhere in the string (this is what Perl does by default).

Note that match may differ from search even when using a regular expression beginning with ‘^’: ‘^’ matches only at the start of the string, or in MULTILINE mode also immediately following a newline. The “match” operation succeeds only if the pattern matches at the start of the string regardless of mode, or at the starting position given by the optional pos argument regardless of whether a newline precedes it.

Now, enough talk. Time to see some example code:

# example code:

string_with_newlines = “””something
someotherthing”””

import re

print re.match(‘some’, string_with_newlines) # matches
print re.match(‘someother’,
string_with_newlines) # won’t match
print re.match(‘^someother’, string_with_newlines,
re.MULTILINE) # also won’t match
print re.search(‘someother’,
string_with_newlines) # finds something
print re.search(‘^someother’, string_with_newlines,
re.MULTILINE) # also finds something

m = re.compile(‘thing$’, re.MULTILINE)

print m.match(string_with_newlines) # no match
print m.match(string_with_newlines, pos=4) # matches
print m.search(string_with_newlines,
re.MULTILINE) # also matches

Python Programming Interview Questions And Answers

155) How do I parse XML in Python?

I have many rows in a database that contains xml and I’m trying to write a Python script that will go through those rows and count how many instances of a particular node attribute show up. For instance, my tree looks like:

How can I access the attributes 1 and 2 in the XML using Python?

A) I suggest ElementTree. There are other compatible implementations of the same API, such as lxml, and cElementTree in the Python standard library itself; but, in this context, what they chiefly add is even more speed — the ease of programming part depends on the API, which ElementTree defines.

After building an Element instance e from the XML, e.g. with the XML function, or by parsing a file with something like

import xml.etree.ElementTree
e = xml.etree.ElementTree.parse(‘thefile.xml’).getroot()
or any of the many other ways shown at ElementTree, you just do something like:

for atype in e.findall(‘type’):
print(atype.get(‘foobar’))

and similar, usually pretty simple, code patterns.

156) What is __init__.py for?

What is __init__.py for in a Python source directory?

A) The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later (deeper) on the module search path. In the simplest case, __init__.py can just be an empty file, but it can also execute initialization code for the package or set the __all__ variable, described later.

157) Replacements for switch statement in Python?

I want to write a function in Python that returns different fixed values based on the value of an input index.

In other languages I would use a switch or case statement, but Python does not appear to have a switch statement. What are the recommended Python solutions in this scenario?

A) You could use a dictionary:

def f(x):
return {
‘a’: 1,
‘b’: 2,
}[x]

Python Programmer Interview Questions

158) Parsing values from a JSON file?

I have this JSON in a file:

{
“maps”: [
{
“id”: “blabla”,
“iscategorical”: “0”
},
{
“id”: “blabla”,
“iscategorical”: “0”
}
],
“masks”: [
“id”: “valore”
],
“om_points”: “value”,
“parameters”: [
“id”: “valore”
]
}

I wrote this script which prints all of the json text:

json_data=open(file_directory).read()

data = json.loads(json_data)
pprint(data)

How can I parse the file and extract single values?

A) I think what Ignacio is saying is that your JSON file is incorrect. You have [] when you should have {}. [] are for lists, {} are for dictionaries.

Here’s how your JSON file should look, your JSON file wouldn’t even load for me:

{
“maps”: [
{
“id”: “blabla”,
“iscategorical”: “0”
},
{
“id”: “blabla”,
“iscategorical”: “0”
}
],
“masks”: {
“id”: “valore”
},
“om_points”: “value”,
“parameters”: {
“id”: “valore”
}
}
Then you can use your code:

import json
from pprint import pprint

with open(‘data.json’) as f:
data = json.load(f)

pprint(data)
With data, you can now also find values like so:

data[“maps”][0][“id”]
data[“masks”][“id”]
data[“om_points”]

Try those out and see if it starts to make sense.

159) What is the purpose of the single underscore “_” variable in Python?

What is the meaning of _ after for in this code?

if tbh.bag:
n = 0
for _ in tbh.bag.atom_set():
n += 1

A) _ has 3 main conventional uses in Python:

To hold the result of the last executed expression(/statement) in an interactive interpreter session. This precedent was set by the standard CPython interpreter, and other interpreters have followed suit

For translation lookup in i18n (see the gettext documentation for example), as in code like: raise forms.ValidationError(_(“Please enter a correct username”))

As a general purpose “throwaway” variable name to indicate that part of a function result is being deliberately ignored, as in code like: label, has_label, _ = text.partition(‘:’)

The latter two purposes can conflict, so it is necessary to avoid using _ as a throwaway variable in any code block that also uses it for i18n translation (many folks prefer a double-underscore, __, as their throwaway variable for exactly this reason).

Python Programming Questions And Answers

160) Reverse a string in Python

There is no built in reverse function for Python’s str object. What is the best way of implementing this method?

If supplying a very concise answer, please elaborate on its efficiency. For example, whether the str object is converted to a different object, etc.

A) How about:

>>> ‘hello world'[::-1]
‘dlrow olleh’

This is extended slice syntax. It works by doing [begin:end:step] – by leaving begin and end off and specifying a step of -1, it reverses a string.

161) How do I protect Python code?

I am developing a piece of software in Python that will be distributed to my employer’s customers. My employer wants to limit the usage of the software with a time restricted license file.

If we distribute the .py files or even .pyc files it will be easy to (decompile and) remove the code that checks the license file.

Another aspect is that my employer does not want the code to be read by our customers, fearing that the code may be stolen or at least the “novel ideas”.

Is there a good way to handle this problem? Preferably with an off-the-shelf solution.

The software will run on Linux systems (so I don’t think py2exe will do the trick).

A) Python, being a byte-code-compiled interpreted language, is very difficult to lock down. Even if you use a exe-packager like py2exe, the layout of the executable is well-known, and the Python byte-codes are well understood.

Usually in cases like this, you have to make a tradeoff. How important is it really to protect the code? Are there real secrets in there (such as a key for symmetric encryption of bank transfers), or are you just being paranoid? Choose the language that lets you develop the best product quickest, and be realistic about how valuable your novel ideas are.

If you decide you really need to enforce the license check securely, write it as a small C extension so that the license check code can be extra-hard (but not impossible!) to reverse engineer, and leave the bulk of your code in Python.

Complex Python Interview Questions

162) How to split a string into a list?

I want my python function to split a sentence (input) and store each word in a list. The code that I’ve written so far splits the sentence, but does not store the words as a list. How do I do that?

def split_line(text):

# split the text
words = text.split()

# for each word in the line:
for word in words:

# print the word
print(word)

A) text.split()

This should be enough to store each word in a list. words is already a list of the words from the sentence, so there is no need for the loop.

Second, it might be a typo, but you have your loop a little messed up. If you really did want to use append, it would be:

words.append(word)
not

word.append(words)

163) What does “list comprehension” mean? How does it work and how can I use it?

A) List comprehensions provide a concise way to create lists. Common applications are to make new lists where each element is the result of some operations applied to each member of another sequence or iterable, or to create a subsequence of those elements that satisfy a certain condition.

164) Difference between append vs. extend list methods in Python

What is the difference between the list methods append() and extend()?

A) append adds an element to a list, extend concatenates the first list with another list (or another iterable, not necessarily a list.)

append: Appends object at end.

x = [1, 2, 3]
x.append([4, 5])
print (x)

gives you: [1, 2, 3, [4, 5]]

extend: Extends list by appending elements from the iterable.

x = [1, 2, 3]
x.extend([4, 5])
print (x)

gives you: [1, 2, 3, 4, 5]

165) What exactly are iterator, iterable, and iteration?

What are the most basic definitions of “iterable”, “iterator” and “iteration in Python?

A) Iteration is a general term for taking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration.

In Python, iterable and iterator have specific meanings.

An iterable is an object that has an __iter__ method which returns an iterator, or which defines a __getitem__ method that can take sequential indexes starting from zero (and raises an IndexError when the indexes are no longer valid). So an iterable is an object that you can get an iterator from.

An iterator is an object with a next (Python 2) or __next__ (Python 3) method.

Whenever you use a for loop, or map, or a list comprehension, etc. in Python, the next method is called automatically to get each item from the iterator, thus going through the process of iteration.

PeopleSoft Integration Broker Interview Questions And Answers 2018

PeopleSoft Integration Broker Interview Questions And Answers 2018. Here Coding compiler sharing a list of 20 interview questions on PeopleSoft Integration Broker. These integration broker interview questions were asked in various interviews and prepared by expert PeopleSoft integration broker professionals. We hope that these PeopleSoft integration broker questions will help you to crack your next job interview. All the best for your future and happy learning.

PeopleSoft Integration Broker Interview Questions

What is PeopleSoft Integration Broker?
What are the most important subsystems of PeopleSoft Integration Broker?
What are Integration Gateway and the Integration Engine in PeopleSoft Integration Broker?
What are Web Services in PeopleSoft Integration Broker?
What are the benefits of Integration Gateway?
What are the benefits of Integration Engine?
What are the components of Integration Gateway Architecture?
What are the components of Integration Engine Architecture?
What are service operations in PeopleSoft Integration Broker?
What are the different Service Operation Types?
What are the different Messaging Types in PeopleSoft Integration Broker?
What is Synchronous messaging?
What is Asynchronous messaging?
What is the Order of Precedence for Creating Integration Metadata?
What is PSCAMA?

PeopleSoft Integration Broker Interview Questions And Answers

1) What is PeopleSoft Integration Broker?

A) PeopleSoft Integration Broker is a middleware technology that: Performs asynchronous and synchronous messaging among internal systems and third-party systems. Exposes PeopleSoft business logic as web services to PeopleSoft and third-party systems.

2) What are the most important subsystems of PeopleSoft Integration Broker?

A) PeopleSoft Integration Broker consists of two most important subsystems, they are:

Integration Gateway and the Integration Engine.

3) What are Integration Gateway and the Integration Engine in PeopleSoft Integration Broker?

A) The integration gateway resides on a PeopleSoft web server, and the integration engine is installed on an application server as part of the PeopleSoft application.

4) What are Web Services in PeopleSoft Integration Broker?

A) PeopleSoft Integration Broker enables you to provide web services to other PeopleSoft systems and external integration partners by generating Web Services Description Language (WSDL) documents and Web Application Definition Language (WADL) document from integration metadata.

PeopleSoft supports providing WSDL documents and WADL documents to the PeopleSoft WSDL repository. The system also supports providing WSDL documents to Universal Description, Discovery, and Integration (UDDI) repositories.

PeopleSoft Integration Broker Interview Questions # 5) What are the benefits of Integration Gateway?

A) The integration gateway is a platform that manages the receipt and delivery of messages passed among systems through PeopleSoft Integration Broker. It supports the leading TCP/IP application protocols used in the marketplace today and provides extensible interfaces to develop new connectors for communication with legacy, enterprise resource planning, and internet-based systems.

Additional features include:

Backward compatibility for Extensible Markup Language (XML) links and PeopleSoft Application Messaging.

Listening connectors and target connectors that transport messages between integration participants and the integration engine.

Basic logging information concerning message receipt, delivery, and errors.

Connection persistence with continuous open feeds to external systems through connectors, with full failover capabilities.

Transport protocol and message format management so that when messages reach the integration engine, they have a PeopleSoft-compatible message format.

PeopleSoft Integration Broker Interview Questions # 6) What are the benefits of Integration Engine?

A) The integration engine runs on the PeopleSoft application server. Rather than communicating directly with other applications, the integration engine sends and receives messages through one or more separately installed integration gateways.

The integration engine:

Uses a modular architecture, so it can treat gateways as black boxes and communicate with them using standard connectors.

Adapts elements of an existing integration to produce a new integration with only minor adjustments.

Handles messages containing data in a variety of formats. Formats include the PeopleSoft rowset-based message format, and nonrowset-based message structures including , XML document object model messages, Simple Object Access Protocol (SOAP) messages, and non-XML files.

Sends and receives messages asynchronously (like email) or synchronously (suspending activity to wait for a response).

Applies message transmission type and routing based on specifications that you define in a PeopleSoft Pure Internet Architecture component.

By developing and applying application engine transform programs, the application engine can transform message structure and translate data content according to specifications that you define in PeopleSoft Pure Internet Architecture components.

You develop transform application engine programs in PeopleCode or Extensible Stylesheet Language Transformation (XSLT) code.

These specifications can be reused for other integrations.

Handles security features such as authentication, nonrepudiation, and cookies.

7) What are the components of Integration Gateway Architecture?

A) The key components in integration gateway architecture are,

Architecture components.

Connectors.
Gateway manager.
Gateway services.

Interview Questions on PeopleSoft Integration Broker

8) What are the components of Integration Engine Architecture?

A) The integration engine uses a variety of PeopleTools elements to create, implement, manage, and enhance integrations. Its modular architecture separates integration development activities from administrative activities.

The integration engine is a combination of PeopleSoft Application Designer definitions, PeopleSoft Pure Internet Architecture definitions, PeopleCode, and XSLT code, along with the underlying mechanisms that tie all these elements together.

The underlying mechanisms include the request handlers that process both inbound and outbound messages according to the specifications in the development and administrative elements.

The integration engine resides on the PeopleSoft application server.

9) What are service operations in PeopleSoft Integration Broker?

A) A service operation in the PeopleSoft system contains the processing logic for an integration and determines if the integration is to be processed synchronously or asynchronously. A service operation definition contains the following definitions:

Message. A message contains the payload of the integration.

XML message schema. Message schemas provide the physical description of the data that is being sent, including descriptions of fields, field types, field lengths, and so on.

Handler. A service operation handler contains the processing logic for the service operation.

Routing. A routing definition specifies the direction of the integration (inbound or outbound), routing alias names, transformations, and more.

10) What are the different Service Operation Types?

A) PeopleSoft Integration Broker supports four types of service operations:

Asynchronous one-way.
Asynchronous request/response.
Asynchronous to synchronous.
Synchronous

Advanced PeopleSoft Integration Broker Interview Questions

11) What are the different Messaging Types in PeopleSoft Integration Broker?

A) PeopleSoft Integration Broker supports asynchronous and synchronous messaging.

PeopleSoft Integration Broker Interview Questions # 12) What is Synchronous messaging?

A) In synchronous messaging, a message is sent to a target system. The sending system must receive a response from the target system before it continues to process additional messages.

PeopleSoft Integration Broker Interview Questions # 13) What is Asynchronous messaging?

A) In asynchronous messaging, a message is sent to a target system. However, the sending system does not need to receive a response from the target system before it can continue processing messages. This type of messaging is also referred to as fire-and-forget messaging.

14) What is the Order of Precedence for Creating Integration Metadata?

A) Create integration metadata in the following order:

Integration gateway definition.
Node definition.
Message definition.
Integration PeopleCode.
Transformation programs.
Queue definition.
Service definition.
Service operation definition.
Handler definition.
Routing definition.

PeopleSoft Integration Broker Interview Questions For Experienced

PeopleSoft Integration Broker Interview Questions # 15) What is PSCAMA?

A) PeopleTools adds the PSCAMA record to every level of the message structure during processing. It isn’t accessible in the message definition, but you can reference it as part of the Message object in the sending and receiving PeopleCode, and you can see it in the Integration Broker Monitor. PeopleCode processes this record the same way as any other record.

PeopleSoft Integration Broker Interview Questions # 16) What are Message Container Structures?

A) Message container structures hold rowset-based or nonrowset-based message part structures. All message parts assigned to a container must of the same type, rowset-based or nonrowset-based. A message container is always a nonrowset-based message.

PeopleSoft Integration Broker Interview Questions # 17) What is Message Schema Builder?

A) The message Schema Builder enables you to build, import, modify and delete XML message schemas.

PeopleSoft Integration Broker Interview Questions # 18) What are services?

A) Services are used to logically group a set of service operations.

For example, if you have a number of service operations that are related to customers, such as those pertaining to customer information, adding customers, updating customers, deleting customers, and so on, you can create a customer web service and then associate the related service operations with that service.

PeopleSoft Integration Broker Interview Questions # 19) What are Service Operations?

A) A service operation definition consists of general information about an operation, such as its name, description, and so on. It also specifies an operation type, which determines how the operation is to be processed, synchronously or asynchronously.

PeopleSoft Integration Broker Interview Questions # 20) What are REST Services?

A) REST services are used to logically group a set of REST service operations.

PeopleSoft Application Engine Interview Questions And Answer 2018

PeopleSoft Application Engine Interview Questions And Answer 2018. Here Coding compiler sharing a list of 42 interview questions on PeopleSoft Application Engine. These app engine questions were prepared by PeopleSoft experts and asked in various PeopleSoft interviews. We hope that these PeopleSoft app engine questions will help you to crack your next job interview. All the best for your future and happy learning.

PeopleSoft Application Engine Interview Questions

What is PeopleSoft Application Engine?
What are the components of PeopleSoft Application Engine?
What is a program in PeopleSoft Application Engine?
Does PeopleSoft Application Engine generate SQL or PeopleCode?
What is Batch Processing in PeopleSoft Application Engine?
What is PeopleSoft meta-SQL?
Can you write a sample code in meta-SQL?
What are the key Application Engine Program Elements?
What is a program in PeopleSoft Application Engine?
What is a section in PeopleSoft Application Engine?
What is a step in PeopleSoft Application Engine?
What are actions in PeopleSoft Application Engine?
What are Do Actions in PeopleSoft Application Engine?
What are the types of Do Actions in Peoplesoft Application Engine?
What is a Log Message in Peoplesoft Application Engine?

PeopleSoft Application Engine Interview Questions And Answers

1) What is PeopleSoft Application Engine?

A) PeopleSoft Application Engine is a PeopleTool designed to help us in develop, test, and run background SQL processing programs.

2) What are the components of PeopleSoft Application Engine?

A) PeopleSoft Application Engine comprises two distinct components, they are designer and runtime.

A designer where we can define our batch program and the runtime where you run and monitor your program.

3) What is a program in PeopleSoft Application Engine?

A) In PeopleSoft Application Engine, a program is a set of SQL statements, PeopleCode, and program control actions (that enable looping and conditional logic) defined in PeopleSoft Application Designer that performs a business process.

4) Does PeopleSoft Application Engine generate SQL or PeopleCode?

A) PeopleSoft Application Engine does not generate SQL or PeopleCode, it executes the SQL and PeopleCode that you include in an Application Engine action as part of your overall program.

5) What is Batch Processing in PeopleSoft Application Engine?

A) PeopleSoft Application Engine is designed for batch processing where you have a large (or small) amount of data that must be processed without user intervention

PeopleSoft Application Engine Interview Questions # 6) What is PeopleSoft meta-SQL?

A) PeopleSoft meta-SQL is designed to replace RDBMS-specific SQL syntax with a standard syntax, called meta-strings.

PeopleSoft meta-SQL enables you to dynamically generate portions of your SQL statements.

7) Can you write a sample code in meta-SQL?

A) For example, if you want to join two tables on their common keys, use the following code:

%Join(COMMON_KEYS, PSAESECTDEFN ABC, PSAESTEPDEFN XYZ )

8) What are the key Application Engine Program Elements?

A) A PeopleSoft Application Engine program is made up of several key elements:

Program
Sections
Steps
Actions
Do Actions
SQL
PeopleCode
Log Message
Call Section
State Record

PeopleSoft Application Engine Interview Questions # 9) What is a program in PeopleSoft Application Engine?

A) Program Identifies the set of processes to execute a given task. A program must contain at least one section. The execution of the program always starts with the section defined as “MAIN.”

10) What is a section in PeopleSoft Application Engine?

A) Sections Comprise one or more steps and is equivalent to a COBOL paragraph or an SQR procedure. All Application Engine programs must contain at least one section entitled “MAIN.”

A section is a set of ordered steps that gets executed as part of a program.

Interview Question on PeopleSoft Application Engine

11) What is a step in PeopleSoft Application Engine?

A) The smallest unit of work that can be committed within a program. We can use a step to execute a PeopleCode command or log a message, typically, you use a step to execute a SQL statement or to call another section.

PeopleSoft Application Engine Interview Questions # 12) What are actions in PeopleSoft Application Engine?

A) There are multiple types of actions that you can specify to include within a step. Keep in mind that it is common to have multiple actions associated with a single step.

PeopleSoft Application Engine Interview Questions # 13) What are Do Actions in PeopleSoft Application Engine?

A) Do actions contain a SQL SELECT statement designed to return results on which subsequent actions depend. For instance, if a SELECT returns no rows, subsequent actions may not need to execute.

14) What are the types of Do Actions in Peoplesoft Application Engine?

A) A Do action is equivalent to a COBOL PERFORM statement and has similar constructs.

The four types of Do actions are:

Do While
Do When
Do Select
Do Until

15) What is a Log Message in Peoplesoft Application Engine?

A) A Log Message action can be used to write a message to the MESSAGE_LOG based on a particular condition in your program. This gives your program multi-language capability.

The system stores the message generically as a message set, message number, and parameter values. When the end user views the messages using the Application Engine Messages panel, PeopleTools retrieves the appropriate message string from the Message Catalog based on the user’s language preference.

PeopleSoft Application Engine Interview Questions # 16) What is a State Record?

A) A PeopleSoft record that must be created and maintained by the Application Engine developer. This record defines the fields a program uses to pass values from one action to another.

17) What are the various types of Application Engine programs?

A) There are five types of Application Engine programs, they are,

Standard, which is a normal entry-point program.
Upgrade Only, which is used in PeopleSoft Upgrade utilities.
Import Only, which is used by PeopleSoft Import utilities.
Daemon Only, a special type of program used as a daemon.
Transform Only, another special program type used to support XSLT.

PeopleSoft Application Engine Interview Questions # 18) What is PSDAEMON?

A) PeopleSoft Application Engine has a new daemon process, called PSDAEMON, that runs continuously when the Process Scheduler is running, and is intended for recurrent jobs.

PeopleSoft Application Engine Interview Questions # 19) What is a Transform Program Type?

A) These type of programs enable different systems to communicate with one another by transforming messages into appropriate formats.

PeopleSoft Application Engine Interview Questions # 20) What is definition view?

A) Definition view is where you create your definitions within a defined hierarchical structure. Within the metaphor of the definition view, nodes represent the definitions. A node is the visual representation of a section, step, or action that you can select, collapse, modify, and so on.

PeopleSoft App Engine Interview Questions

PeopleSoft Application Engine Interview Questions # 21) What is a Program Flow View?

A) The Program Flow view is a read-only view that shows the expected sequence of steps to be executed at runtime for the program you are developing.

22) What are the actions available within a step in application engine program?

A) The following types of actions are available for an Application Engine program:

SQL
Do (When, While, Select, Until)
PeopleCode
Call Section
Log Message
XSLT (enabled for Transform Only program types)

PeopleSoft Application Engine Interview Questions # 23) What does DO When action?

A) The Do When action is a SELECT statement that allows subsequent actions to be executed if any rows of data are returned.

PeopleSoft Application Engine Interview Questions # 24) What does Do While?

A) The Do While action is a SELECT statement that, if present, runs before subsequent actions of the step. If the Do While does not return any rows of data, the action terminates.

PeopleSoft Application Engine Interview Questions # 25) What does Do Select?

A) The Do Select action is a SELECT statement that executes subsequent actions once for every row of data that the Do Select returns. For instance, a Do Select can execute a SQL statement for each row returned from the SELECT statement.

PeopleSoft Application Engine Interview Questions # 26) What does Do Until?

A) A Do Until action is a Select statement that runs after each action when a step completes. If the Select returns any rows of data, the step terminates.

PeopleSoft Application Engine Interview Questions # 27) What are PeopleCode Actions?

A) Use this action type to insert PeopleCode within your Application Engine program. You can invoke the PeopleCode Editor directly from the designer interface to code your PeopleCode programs.

PeopleSoft Application Engine Interview Questions # 28) What is Call Section Actions?

A) Use the Call Section action to call another section defined in an Application Engine program. You can call a (local) section defined within your current program and you can make external calls to a section defined in another Application Engine program.

PeopleSoft Application Engine Interview Questions # 29) What are State Records?

A) We can assign variables for your Application Engine program through state records, while sections, steps, and actions pass values to subsequent program steps through state records.

PeopleSoft Application Engine Interview Questions # 30) What is Set Processing?

A) Set processing is an SQL technique used to process groups, or sets of rows at one time rather than processing each row individually.

Set processing enables you to apply your business rule directly on the data (preferably while it resides in a temporary table) in the database using an update or insert/select statement.

Advanced PeopleSoft Application Engine Interview Questions

PeopleSoft Application Engine Interview Questions # 31) What is a %Bind?

A) Retrieves a field value from a state record and can be used anywhere in a SQL statement. When executed, %Bind returns the value of the state record field identified within its parentheses.

%BIND([recordname.]fieldname[,NOQUOTES][,NOWRAP][,STATIC])

PeopleSoft Application Engine Interview Questions # 32) What is %ExecuteEdits?

A) Enables PeopleSoft Application Engine to support data dictionary edits in batch. It is Application Engine-only meta-SQL, you cannot use it in COBOL, SQR, or PeopleCode—not even Application Engine PeopleCode.

%ExecuteEdits(<type>, recordname [alias][, field1, field2, …])

PeopleSoft Application Engine Interview Questions # 33) What is %Select?

A) This function is required at the beginning of any and all SELECT statements. For example, you need one in the flow control actions and one in the SQL actions that contain a SELECT.

The %SELECT function identifies the state record fields to hold the values returned by the corresponding SELECT statement. In other words, you use %SELECT to pass values to the state record buffers.

PeopleSoft Application Engine Interview Questions # 34) What is %SelectInit?

A) This meta-SQL construct is identical to %SELECT with the following exception if the SELECT returns no rows, %SelectInit reinitializes the buffers. In the case of a %SELECT and no rows are returned, the state record fields retain their previous values.

PeopleSoft Application Engine Interview Questions # 35) What is %SQL?

A) When you use %SQL in a statement, PeopleSoft Application Engine replaces it with the specified SQL object. This enables commonly used SQL text to be shared among Application Engine and PeopleCode programs alike. In PeopleSoft Application Engine, you use %BIND to specify your bind variables.

In PeopleCode SQL, you can use

:record.field
or
:1

PeopleSoft Application Engine Interview Questions For Experienced

PeopleSoft Application Engine Interview Questions # 36) What is %Table?

A) This function returns the SQL table name for the record specified with recname. The basic syntax is:

%Table(recname)

For example,

%Table(ABSENCE_HIST)

Returns the record PS_ABSENCE_HIST.

37) What is %TruncateTable?

A) This construct is functionally identical to a DELETE SQL statement with no WHERE clause, but it is faster on databases that support bulk deletes.

38) What is %UpdateStats?

A) PeopleSoft Application Engine replaces this meta-SQL construct with a platform-dependent SQL statement that updates the system catalog tables used by the database optimizer in choosing optimal query plans.

39) What is AESection Object?

A) The AESection PeopleCode object enables you to change the properties of an Application Engine program Section dynamically without having to modify any of the Application Engine tables directly. This enables you to develop “rule-based” applications that conform dynamically to variables that an end user submits through a page, such as the Application Engine Request page.

40) What is File Layout Object?

A) The file layout object enables you to perform file input/output operations with PeopleSoft Application Engine using PeopleCode. With the File object, you can open a file (for reading or writing), read data from a file, or write data to it. Using the combination of the File Object and PeopleSoft Application Engine provides an effective method to integrate (or exchange) the data stored in a legacy system with your PeopleSoft system.

PeopleSoft Application Engine Interview Questions # 41) What is CommitWork function?

A) This function commits pending changes (inserts, updates, and deletes) to the database.

PeopleSoft Application Engine Interview Questions # 42) What is Parallel Processing?

A) Parallel processing is used when considerable amounts of data must be updated or processed within a limited amount of time, or “batch window.” In most cases, parallel processing is more efficient in environments containing multiple CPU’s and partitioned data.

RSA enVision Interview Questions And Answers 2018

RSA enVision Interview Questions And Answers 2018. Here Coding compiler sharing a list of top 10 interview questions on RSA enVision. These RSA enVision questions were asked in various interviews conducted by top companies across the globe and these enVision questions were prepared by RSA enVision professionals. We hope that this post will help you to crack your next enVision job interview. All the best for your future and happy learning.

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RSA SecurID Interview Questions And Answers 2018

RSA SecurID Interview Questions And Answers 2018. Here Coding compiler sharing a list of 11 interview questions on RSA SecurID. These RSA SecurID questions were asked in various interviews and written by RSA SecurID experts. We hope that these RSA SecurID questions will help you to crack your next RSA SecurID job interview. All the best for your future and happy learning.

RSA SecurID Interview Questions

What is RSA SecurID?
How many factors are there in RSA SecurID Authentication?
What Is Identity and Access Management?
Why do we use RSA SecurID Access?
What is RSA SecurID Suite?
What are the benefits of RSA SecurID Suite?
What are the different RSA SecurID Access Editions?
What are the different Authenticators of RSA SecurID?
What can we do with RSA SecurID Access?
What is 2FA, MFA authentications in RSA SecurID?
What are the different authentication methods supported by RSA SecurID?

Related Questions: RSA Archer Interview Questions

RSA SecurID Interview Questions And Answers

RSA SecurID Interview Questions # 1) What is RSA SecurID?

A) RSA SecurID is a two-factor authentication technology that is used to protect network resources.

2) How many factors are there in RSA SecurID Authentication?

A) In RSA SecurID authentication is based on two factors one is password or PIN and the other one is an authenticator.

RSA SecurID Interview Questions # 3) What Is Identity and Access Management?

A) Identity and access management systems safeguard critical applications and other resources by providing assurance that the people seeking access to them really are who they claim to be (identity management) and that they’re authorized to use specific resources (access management).

Related Questions: Archer GRC Interview Questions

RSA SecurID Interview Questions # 4) Why do we use RSA SecurID Access?

A) RSA SecurID Access is used to protect critical resources with risk-based multi-factor authentication. RSA SecurID Access addresses a variety of user needs with a broad range of authentication methods including push notification, biometrics, OTP, SMS and tokens.

Interview Questions on RSA SecurID

RSA SecurID Interview Questions # 5) What is RSA SecurID Suite?

A) RSA SecurID Suite transforms secure access with risk-based multi-factor authentication and simplified identity governance and lifecycle capabilities.

The RSA SecurID Suite is the only identity and access assurance solution that meets the dynamic access needs of today’s modern workforce. The RSA SecurID Suite offers a comprehensive set of capabilities including access management, authentication, risk analytics, identity governance and lifecycle management.

6) What are the benefits of RSA SecurID Suite?

A) There are many benefits of RSA SecurID, they are,

It Provides Identity and Access Assurance
It Extends Access Protection Everywhere
It Alleviates the Security Burden
It Enables a Risk-Based Approach
It Comes with the Confidence of Thousands

7) What are the different RSA SecurID Access Editions?

A) There are three different RSA SecurID Access editons are there, they are,

Base Edition
Enterprise Edition
Premium Edition

Advanced RSA SecurID Interview Questions For Experienced

RSA SecurID Interview Questions # 8) What are the different Authenticators of RSA SecurID?

A) The very wide range of authenticators are available.

With each of the RSA SecurID Editions, customers can choose their authenticators from a wide range of options—from push notification and “shake to approve” methods to mobile-based biometrics, soft tokens and the most secure hardware token in the industry.

RSA SecurID Interview Questions # 9) What can we do with RSA SecurID Access?

A) With RSA SecurID Access, we can do the following things.

Protect our cloud applications, on-premises applications or both
Leverage push notification, biometrics, OTP, SMS or tokens
Deploy RSA SecurID Access in the cloud or on premises
Use a subscription model or perpetual license

RSA SecurID Interview Questions # 10) What is 2FA, MFA authentications in RSA SecurID?

A) RSA SecurID supports 2FA (Two Factor Authentication) and MFA (Multi-Factor Authentication).

11) What are the different authentication methods supported by RSA SecurID?

A) RSA SecurID offers a wide range of authentication methods including push notifications, SMS, OTP, biometrics, and hardware, software and FIDO tokens. Source

Archer GRC Interview Questions And Answers 2018

Archer GRC Interview Questions And Answers 2018. Here Coding compiler sharing a list of 13 interview questions on Archer GRC. These Archer GRC questions were asked in various interviews and prepared by Archer GRC experts. We are sure that these RSA GRC interview questions will help you to crack your next Archer GRC job interview. All the best for your future and happy learning.

Archer GRC Interview Questions

What is RSA Archer GRC?
What are the benefits of Archer GRC?
Why do we use Archer GRC?
What are the different solutions available in the Archer Governance Risk and Compliance?
Can you describe about Business Risk Management solutions?
What is Archer GRC framework for business risk management?
What are the elements of GRC-based business risk management framework?
What is General Data Protection Regulation (GDPR)?
What is RSA Archer Data Governance?
What is RSA Archer Privacy Program Management?
What can we do with RSA Archer Audit Management?
What can we do with RSA Archer Platform?
What are the benefits of Archer GRC platform?

Archer GRC Interview Questions And Answers

1) What is RSA Archer GRC?

A) RSA Archer GRC (Governance, Risk and Compliance) is an RSA archer suite that offers the depth, breadth and adaptability organizations need to manage risk in multiple domains, combined with the ecosystem and track record to deliver strategic value to the organization.

2) What are the benefits of Archer GRC?

A) RSA archer grc provides many benefits to the organizations in governance, rist and compliance, they are.

GRC enables collaboration on risk issues across business
GRC allows companies to define and enforce accountability
GRC is an most flexible configurable platform
GRC enhances business performance to take decisions faster
GRC enables organizations to automate the processes
GRC provides best practices to quickly implement effective risk management processes

Archer GRC Interview Questions # 3) Why do we use Archer GRC?

A) RSA Archer can help organization’s GRC program with solutions built on industry standards and best practices.

4) What are the different solutions available in the Archer Governance Risk and Compliance?

A) There are different build in solutions available in Archer GRC, they are,

RSA Archer Audit Management
RSA Archer Business Resiliency
RSA Archer Enterprise & Operational Risk Management
RSA Archer IT & Security Risk Management
RSA Archer Regulatory & Corporate Compliance Management
RSA Archer Public Sector Solutions
RSA Archer Third Party Governance
RSA Archer Platform

5) Can you describe about Business Risk Management solutions?

A) Business Risk Management solutions are about more than security. They provide an accurate, aggregated and timely view of all enterprise risk—whether that risk is associated with people, processes, technologies, third parties or regulations —and provide a unified response to any security incident.

Interview Questions on Archer GRC

Archer GRC Interview Questions # 6) What is Archer GRC framework for business risk management?

A) A GRC framework for business risk management can help you identify key business priorities and align them with security information and decisions.

7) What are the elements of GRC-based business risk management framework?

A) GRC-based business risk management framework, including tips for:

Defining what information needs to be protected and identifying the location and amount of important information
Documenting processes and enterprise risk controls documenting the activities as business processes and documenting the risks associated with the processes
Determining levels of inherent and residual risk and answering the question of what to do with a residual risk level that exceeds risk tolerance and appetite

Archer GRC Interview Questions # 8) What is General Data Protection Regulation (GDPR)?

A) The European Union (EU) General Data Protection Regulation (GDPR), taking effect in May of 2018, will be a game-changing regulation that will reset the best practice models for data privacy and protection globally. The GDPR increases privacy rights for individuals and gives regulatory authorities greater powers to take action against businesses that breach the new law.

Archer GRC Interview Questions # 9) What is RSA Archer Data Governance?

A) RSA Archer Data Governance is designed to provide the framework to better identify, manage and implement proper controls around data processing activities involving personally identifiable information (PII).

10) What is RSA Archer Privacy Program Management?

A) RSA Archer Privacy Program Management is built upon the capabilities provided by the RSA Archer Data Governance use case and is designed to help organizations identify and assess the privacy impacts and risks posed by data processing activities involving PII.

Advanced Archer GRC Interview Questions

11) What can we do with RSA Archer Audit Management?

A) With the help of RSA archer audit management, we can execute organizations audit plan using a consistent, risk-based approach to drive greater efficiency and gain control of the complete audit lifecycle.

Archer GRC Interview Questions # 12) What can we do with RSA Archer Platform?

A) The RSA Archer GRC Platform provides a common foundation to manage policies, controls, risks, assessments and deficiencies across your lines of business. Improve cross-functional collaboration and alignment among IT, finance, operations and legal with an integrated framework and common processes and data.

Archer GRC Interview Questions # 13) What are the benefits of Archer GRC platform?

A) The RSA Archer GRC Platform provides a common foundation for managing policies, controls, risks, assessments and deficiencies across your lines of business. The Platform is designed to be:

Flexible – The Platform offers a point-and-click interface for building and managing business applications. Non-technical users can automate processes, streamline workflow, control user access, tailor the user interface and report in real-time.

Unified – RSA provides as common platform to manage policies, controls, risks, assessments and deficiencies across lines of business. This unified approach eases system complexity, strengthens user adoption and reduces training time.

Collaborative – The Platform enables cross-functional collaboration and alignment. Business users across IT, finance, operations and legal domains can work together in an integrated framework using common processes and data.

Blockchain Interview Questions And Answers 2018

Blockchain Interview Questions And Answers 2018. Here Coding compiler sharing a list of 20 interview questions on Blockchain. These Blockchain questions were asked in various interviews conducted by top MNC companies and prepared by Blockchain experts. We are sure that these advanced Blockchain questions will help you to crack your next Blockchain job interview. All the best for your future and happy learning.

Blockchain Interview Questions

What is Blockchain?
What does Blockchain do?
What are the features of Blockchain?
Why do we need decentralized systems?
Benefits of Blockchain Technology?
What are the benefits of the distributed ledger?
What are confirmations on the Blockchain?
What is a hash on the Blockchain?
What is a Blockchain client?
What is a nonce in a Blockchain?
What is a Node in Blockchain?
What are Smart Contracts?
What is a block in Blockchain?
What is block time in Blockchain?
What is the hard fork?
What are the types of Blockchains?

Blockchain Interview Questions And Answers

1) What is Blockchain?

A) A blockchain is a digitized, decentralized, public ledger of all cryptocurrency transactions. Constantly growing as ‘completed’ blocks (the most recent transactions) are recorded and added to it in chronological order, it allows market participants to keep track of digital currency transactions without central recordkeeping.

2) What does Blockchain do?

A) Blockchain is, quite simply, a digital, decentralized ledger that keeps a record of all transactions that take place across a peer-to-peer network.

Blockchain Interview Questions # 3) What are the features of Blockchain?

A) The key features of blockchain are,

Distributed Database – Information stored on a blockchain exists as a shared and continually reconciled database.
Decentralized Systems – Decentralized systems enables users to store their assets in a network that can be accessed over the Internet.
Distributed Ledger – It provides information of all the digital transactions and the users who have done the digital transactions ever.
Safer and Secure Ecosystem – Due to its incorruptible digital ledger of economic transactions that can be programmed to record digital transactions provides safer and secure ecosystem.

4) Why do we need decentralized systems? Benefits of Blockchain Technology?

A) Decentralization benefits in various ways they are:

Entitle users: Decentralized systems enables users to keep control of all their digital transactions.

Fault tolerance: Decentralized systems helps in controlling fault tolerance because they are less likely to fail accidentally.

Durability and robustness: Blockchain doesn’t contain centralized system. It’s distributed and it’s very hard to attack and more expensive to destroy or manipulate.

Free from frauds: It’s very much tough in decentralized systems to commit frauds and scams to benefit from the system.

Faster transaction time: Blockchain and decentralized technology enable users to do transactions faster and reduce time to minutes when compared to normal bank transactions.

Lower cost for transactions: Decentralized systems like Blockchain get rid of third-party intermediaries and transaction costs, and service charger for exchanging assets. This greatly reduces the transaction fees and benefits users.

Provides lucidity: Blockchain is very transparent technology, the data can be publicly viewable, and all transactions can’t be altered or deleted.

Data authenticity: In a decentralized system like blockchain data is complete, consistent, timely, accurate, and widely available over the network.

Blockchain Interview Questions # 5) What are the benefits of the distributed ledger?

A) As we know Blockchain is a public ledger and it contains the information like all the participants and all the digital transactions that have ever been executed. There are many advantages of public ledger, they are:

Fraud prevention: In Blockchain data is decentralized and ledger data distributed across the multiple nodes. If there is any unauthorized changes to ledger data, Blockchain technology responds very well and prevents it. Ledger data can’t be changed and it prevents any kind of frauds.

Get rid of multiple ledgers: Blockchain distributed ledger technology helps organizations in maintaining all their transaction data into a single ledger, it reduces the complications of having multiple ledgers.

Ownership Assurance: Distributed ledgers can enable new ways of assuring ownership to the digital assets, goods and intellectual property.

Eliminates Mediatory: Blockchain eliminates mediatory and reduces the transaction time for settlements with keep track of everything in ledger in a secured way.

Interview Questions on Blockchain

Blockchain Interview Questions # 6) What are confirmations on the Blockchain?

A) Bitcoin Confirmations. Roughly every ten minutes, a new block is created and added to the blockchain through the mining process. This block verifies and records any new transactions. The transactions are then said to have been confirmed by the Bitcoin network.

Blockchain Interview Questions # 7) What is a hash on the Blockchain?

A) Signatures are a fundamental part of blockchains. Similar to signing a check, cryptographic signatures determine which transactions are valid. Signatures are generated from a hash of data to be signed, and a private key. Transaction hashes are highly visible in a blockchain.

Blockchain Interview Questions # 8) What is a Blockchain client?

A) A Blockchain client is referred to any node able to parse and verify the blockchain, its smart contracts and everything related. It also allows you/provides interfaces to create transactions and mine blocks which is the key for any blockchain interaction.

Blockchain Interview Questions # 9) What is a nonce in a Blockchain?

A) In cryptography, a nonce is an arbitrary number that can only be used once. It is similar in spirit to a nonce word, hence the name. It is often a random or pseudo-random number issued in an authentication protocol to ensure that old communications cannot be reused in replay attacks.

Blockchain Interview Questions # 10) What is a Node in Blockchain?

A) In Blockchain, Node is a computer connected to the blockchain network using a client that performs the task of validating and relaying transactions) gets a copy of the blockchain, which gets downloaded automatically upon joining the blockchain network.

The Best Blockchain Interview Questions

Blockchain Interview Questions # 11) What are Smart Contracts?

A) Smart contracts help you exchange money, property, shares, or anything of value in a transparent, conflict-free way while avoiding the services of a middleman.

Blockchain Interview Questions # 12) What is a block in Blockchain?

A) Blocks hold batches of valid transactions that are hashed and encoded into a Merkle tree. Each block includes the cryptographic hash of the prior block in the blockchain, linking the two. The linked blocks form a chain. This iterative process confirms the integrity of the previous block, all the way back to the original genesis block.

Blockchain Interview Questions # 13) What is block time in Blockchain?

A) The block time is the average time it takes for the network to generate one extra block in the blockchain.[38] Some blockchains create a new block as frequently as every five seconds. By the time of block completion, the included data becomes verifiable.

Blockchain Interview Questions # 14) What is the hard fork?

A) A hard fork is a rule change such that the software validating according to the old rules will see the blocks produced according to the new rules as invalid. In case of a hard fork, all nodes meant to work in accordance with the new rules need to upgrade their software.

Blockchain Interview Questions # 15) What are the types of Blockchains?

A) There are three types of Blockchain networks are available, they are, Public Blockchains, Private Blockchains and Consortium Blockchains.

Essential Blockchain Interview Questions

Blockchain Interview Questions # 16) Explain about Public Blockchains?

A) A public blockchain has absolutely no access restrictions. Anyone with an internet connection can send transactions to it as well as become a validator

Blockchain Interview Questions # 17) Explain Private blockchains?

A) A private blockchain is a permission. One cannot join it unless invited by the network administrators. Participant and validator access is restricted.

Blockchain Interview Questions # 18) Explain Consortium Blockchains?

A) A consortium blockchain is often said to be semi-decentralized. It, too, is permission but instead of a single organization controlling it, a number of companies might each operate a node on such a network.

Advanced Blockchain Interview Questions For Experienced

19) What are the different types of records in Blockchain technology?

A) There are two different types of records available in Blockchain, they are,

Block Records
Transactional Records

20) What is the difference between the distributed database and traditional database?

A) There are many differences between distributed database and traditional database, they are,

Operations in Distributed Database (Blockchain) and Traditional Database

Blockchain Distributed Database – In blockchain, we can store data but there is no chance for edit and delete.
Traditional Database – In the traditional database, we can perform CRUD operations.

Replication in Blockchain Vs Traditional Database

Blockchain – There is a full replication of block on every peer of the blockchain.
Traditional – Here we can have master-slave multi-master.

The consensus in Blockchain Vs Traditional Database

Blockchain – In blockchain, most of the peers agree on the outcome of transactions.
Traditional – Here in the traditional database, distributed transactions can happen.

RSA Archer Interview Questions And Answers 2018

RSA Archer Interview Questions And Answers 2018. Here Coding compiler sharing a list of 38 interview questions on RSA Archer. These RSA interview questions were asked in various interviews conducted by top MNC companies and prepared by expert RSA Archer professionals. We are sure that these RSA Archer questions will help you to crack your next RSA Archer job interview. All the best for your future and happy learning.

RSA Archer Interview Questions

What is RSA Archer?
What does the RSA stand for?
Why do we use RSA Key?
What is an RSA token used for?
How is RSA used?
Is RSA asymmetric or symmetric?
What is a GRC tool?
What is a GRC platform?
What are the different products of RSA?
What are the benefits of RSA Archer?
What is RSA Archer Audit Management?
What are the benefits of RSA Archer Audit Management?
What is RSA Archer Issues Management?
What is RSA Archer Audit Engagements & Workpapers?
What is RSA Archer Audit Planning & Quality?

RSA Archer Interview Questions And Answers

1) What is RSA Archer?

A) RSA Archer eGRC Solutions allow you to build an efficient, collaborative enterprise governance, risk and compliance (eGRC) program across IT, finance, operations and legal domains. These solutions include Policy, Risk, Compliance, Enterprise, Incident, Vendor, Threat, Business Continuity and Audit Management.

2) What does the RSA stand for?

A) A public-key encryption technology developed by RSA Data Security, Inc. The acronym stands for Rivest, Shamir, and Adelman, the inventors of the technique. The RSA algorithm is based on the fact that there is no efficient way to factor very large numbers.

RSA Archer Interview Questions # 3) Why do we use RSA Key?

A) RSA key is a private key based on RSA algorithm. Since encrypted data transmission takes too much time in case of asymmetric encryption, this kind of encryption is used for a secure symmetric key exchange that is used for actual transmitted data encryption and decryption.

4) What is an RSA token used for?

A) RSA SecurID (“SecurID”) is a two-factor authentication technology that is used to protect network resources. The authentication is based on two factors — something you know (a password or PIN) and something you have (an authenticator).

5) How is RSA used?

A) RSA is a relatively slow algorithm, and because of this, it is less commonly used to directly encrypt user data. More often, RSA passes encrypted shared keys for symmetric key cryptography which in turn can perform bulk encryption-decryption operations at much higher speed.

6) Is RSA asymmetric or symmetric?

A) Asymmetric encryption is also known as public-key cryptography. Asymmetric encryption differs from symmetric encryption primarily in that two keys are used: one for encryption and one for decryption. The most common asymmetric encryption algorithm is RSA.

RSA Archer Interview Questions # 7) What is a GRC tool?

A) Auditing, reporting, monitoring and assessment often require specialist governance, risk management and compliance (GRC) tools. They can be costly, take time to set up and usually necessitate training.

RSA Archer Interview Questions # 8) What is a GRC platform?

A) Governance, risk management and compliance or GRC is the umbrella term covering an organization’s approach across these three areas: Governance, risk management, and compliance.

9) What are the different products of RSA?

A) RSA creates a wide range of industry-leading products that allow customers to take control of risk. Whether those risks stem from external cyber threats, identity and access management challenges, online fraud, compliance pressure or any number of other business and technology issues, RSA’s extensive portfolio of integrated, independently-top rated products better position public- and private-sector enterprises to drive growth and embrace change in today’s complex, volatile world.

They are:

Advanced Threat Detection & Response – RSA NetWitness Suite
Identity and Access Management – RSA SecurID Suite
Governance, Risk & Compliance (GRC) – RSA Archer Suite
Fraud Prevention – RSA Fraud & Risk Intelligence Suite

RSA Archer Interview Questions # 10) What are the benefits of RSA Archer?

A) The benefits of RSA Archer includes,

Enables collaboration on risk issues across business lines and organizational boundaries.
Allows organizations to define and enforce accountability for risk and compliance issues.
Built on the most flexible, configurable and powerful GRC platform in the industry.
Enhances business performance and helps organizations make more informed decisions faster.
Includes pre-built integrations with many other technologies, including security tools and business support applications.
A strong network of certified RSA Archer experts possess the experience and knowledge to lead you on a path to success.
Helps organizations derive efficiencies by automating processes.
Improves visibility by consolidating data and enabling risk analytics across your organization.
Provides a best practices-driven approach to quickly implement effective risk management processes and plan for expansion based on strategy and investment schedule.
Designed with built-in industry standards so that customers can quickly implement the processes that give business leaders the visibility they need.

Interview Questions on RSA Archer

RSA Archer Interview Questions # 11) What is RSA Archer Audit Management?

A) RSA Archer Audit Management improve governance of audit-related activities while integrating your risk and control functions. It ransform the efficiency of your internal audit department, complete risk-scoped audits more quickly, and partner with the business to achieve organization’s goals.

12) What are the benefits of RSA Archer Audit Management?

A) There are many benefits of RSA Archer Audit Management, they are:

Dynamically Adjust Risk-Based Audit Plans
Execute Internal Audit Engagements Efficiently
Tackle Risk and Compliance Issues Across Teams with One Central System
Automates the Audit Processes

RSA Archer Interview Questions # 13) What is RSA Archer Issues Management?

A) RSA archer issue management coordinate issues generated by audit, risk and compliance processes and by operational groups. Lay the foundation to establish prioritization, workflow, structure and accountability to manage findings, remediation plans and exceptions.

14) What is RSA Archer Audit Engagements & Workpapers?

A) It efficiently perform audit engagements, maintain workpaper documentation and provide consistent and timely reporting on audit results.

15) What is RSA Archer Audit Planning & Quality?

A) Take a risk-based approach to audit planning to ensure timely, prioritized and effective audit plans. Easily identify, define and assess the risk of your auditable entities across the organization.

RSA Archer Interview Questions # 16) What is RSA Archer Business Resiliency?

A) RSA archer business resiliency, automate business continuity and disaster recovery planning and execution to protect your ongoing operations. Transform the efficiency of your continuity and recovery teams, address the most critical areas of the business quickly, and partner across the business to achieve your organization’s resiliency goals.

17) What are the benefits of RSA Archer Business Resiliency?

A) The benefits of RSA archer business resiliency are,

It Bring Business Context to Business Continuity & IT Disaster Recovery Planning
Integrate Incident and Crisis Response
Adapt Your Resiliency Program to Align with Your Business Priorities

RSA Archer Interview Questions # 18) What is RSA Archer Business Impact Analysis?

A) RSA Archer Business Impact Analysis, identify critical business processes and prioritize recovery activities.

19) What is RSA Archer Incident Management?

A) RSA archer incident management, centralize and streamline tracking, workflow and resolution of day-to-day incidents, whether they be security, physical or employee-related—before they become business disruptions.

20) What is RSA Archer Business Continuity & IT Disaster Recovery Planning?

A) It implement a coordinated approach to business continuity and IT disaster recovery planning, testing and execution.

RSA Interview Questions And Answers

21) What is RSA Archer Crisis Management?

A) RSA archer crisis management align and activate business continuity and IT disaster recovery plans, and manage and report on crisis events.

RSA Archer Interview Questions # 22) What Is Operational Risk Management?

A) A subset of enterprise risk management, operational risk management (ORM) is a discipline that provides risk professionals with tools and frameworks for identifying, evaluating, monitoring and controlling operational risks.

23) What is RSA Archer Enterprise & Operational Risk Management?

A) Using RSA archer enterprise and operational rist management, gain a clear, consolidated view of risk to efficiently address the most critical issues and elevate risk management as a new source of competitive advantage. Bring risk information together across the organization to consistently identify, assess, evaluate, treat and monitor risks in one central solution.

RSA Archer Interview Questions # 24) What is RSA Archer Risk Catalog?

A) RSA archer risk catalog is used to record and track risks across your enterprise and establish accountability for them. Take a top-down, qualitative approach to assessing inherent and residual risk and enable a three-level rollup of risk, from a granular level up through enterprise risk statements.

25) Can you explain about RSA Archer Top-Down Risk Assessment?

A) Document risks and controls throughout your organization. Perform risk assessments on new products and services, business processes, and mergers and acquisitions.

RSA Archer Interview Questions # 26) What is RSA Archer Loss Event Management?

A) Track and report on loss events, perform root cause analysis, and establish accountability across your enterprise. Manage the loss event lifecycle to understand where and how your operational risk management (ORM) program needs to be strengthened.

RSA Archer Interview Questions # 27) What is RSA Archer Key Indicator Management?

A) Manage the key indicator lifecycle to monitor and report on insights to business risks. Establish and monitor metrics related to each business unit within the organization.

28) What is RSA Archer Bottom-Up Risk Assessment?

A) Implement a consistent risk assessment program to more effectively identify operational risks within your business. Document projects and create questionnaires from the extensive library in RSA Archer.

29) What is RSA Archer Operational Risk Management?

A) Understand the business context of risk with an aggregated view of operational risks across the business. Engage business managers in using consistent methodologies to identify and manage the risks and controls under their purview.

Advanced RSA Archer Interview Questions And Answers For Experienced

30) What is RSA Archer Enterprise Risk Management?

A) Manage risks to strategic business objectives for an edge in today’s competitive market. Consolidate all risks into one view across your enterprise for reporting and analytics, and to help prioritize limited resources.

RSA Archer Interview Questions # 31) What is RSA Archer IT & Security Risk Management?

A) Bridge business context and process enablement to effectively address the complexity and cascading impact of rapidly changing cybersecurity risks. Adjust and evolve threat and vulnerability management processes to stay ahead of growing threats.

32) What are the features of RSA Archer IT & Security Risk Management?

A) The features of RSA Archer IT & Security Risk Management are,

Connect Cybersecurity Risks in the Context of GRC

Bridge Business Context and Process Enablement

Address IT and Security Risk Management Through Multiple Dimensions

Quantify IT and Cyber Security Risk in Financial Terms

33) What are the benefits of RSA Archer IT & Security Risk Management?

A) The benefits of RSA Archer IT & Security Risk Management are,

Establish and track reliable quantitative financial and data metrics to inform an executive-level understanding of cyber security and cyber risk postures.

Reduce the complexity and cascading impact of rapidly changing cybersecurity risks.

Align IT and security processes and policies with higher-level directional strategies to reduce operational risk and support business growth initiatives.

Mitigate the financial, operational and reputational impacts of a cyber attack through early detection and accelerated cyber incident response.

Improve your organization’s overall risk posture by gaining greater visibility into cybersecurity risks across your enterprise.

Obtain the information and insights needed to effectively manage your organization’s portfolio of cyber security and other strategic technology investments

34) What is RSA Archer Regulatory & Corporate Compliance Management?

A) It ensure controls are defined, implemented and measured to meet shifting compliance obligations. Establish a sustainable, repeatable and auditable regulatory compliance program by consolidating information from multiple regulatory bodies and documenting the impact to the business.

RSA Archer Interview Questions # 35) What is the use of RSA Archer Platform?

RSA Archer Interview Questions # 36) What are the features of RSA archer platform?

A) The features of rsa archer platform are,

Application Builder – Build on-demand applications through point-and-click configuration.

Access Control – Enforce who can access specific risk and compliance data at the system, application, record and field levels.

System Integration – Consolidate governance, risk and compliance information of any type. Seamlessly integrate data systems without requiring additional software.

Deployment Flexibility – Balance administrative control, time to value, and cost considerations when planning your implementation with support for on-premises and hosted deployments.

Search, Reports and Dashboards – Take advantage of pre-built reports and dashboards and create your own with the user-friendly web interface.

Advanced Business Workflow – Define and automate business processes for streamlining the management of content, tasks, statuses and approvals.

Globalization – Enable customers to support multiple languages within their RSA Archer environment with region or language locale-specific components

Pre-Built Integrations – Take advantage of pre-built integrations for the RSA Archer GRC Platform available on the RSA Archer GRC Community on RSA Link.

37) What are the benefits of RSA Archer Platform?

A) The benefits of RSA Archer Platform are,

It improves cross-functional collaboration and alignment, with business users across IT, finance, operations and legal working together in an integrated framework using common processes and data.

As the foundation for all RSA Archer GRC solutions and use cases, the platform eases system complexity, strengthens user adoption and reduces training time.

Non-technical users can automate processes, streamline workflows, control user access, tailor the user interface and report in real-time using the point-and-click interface to build and manage business applications.

RSA Archer Interview Questions # 38) What is RSA Exchange?

A) The RSA Exchange is an integral part of the RSA Archer ecosystem, providing a faster and more flexible development cycle for RSA and partners to deliver value-added offerings for customers’ RSA Archer implementations. Source

Commvault Interview Questions And Answers 2018

Commvault Interview Questions And Answers 2018. Here Coding compiler sharing a list of 30 interview questions on Commvault. These Commvault questions were asked in various interviews conducted by top MNC companies and prepared by Commvault experts. We are sure that these real-time advanced Commvault interview questions for experienced, will help you to crack your next Commvault job interview. All the best for your future and happy learning.

Commvault Interview Questions

What is Commvault?
How is data protected using Commvault?
What are the different Enterprise Data Mangement Solutions of Commvault?
WHAT AREAS OF DATA MANAGEMENT DOES THIS COMMVAULT SUPPORT?
WHAT IS THE BREADTH AND DEPTH OF CLOUD SUPPORT OF COMMVAULT?
WHAT ARE THE DATA MIGRATION CAPABILITIES OF THE SYSTEM?
WHAT DATA MANAGEMENT CAPABILITIES ARE INCLUDED IN COMMVAULT?
HOW DOES THE DATA MANAGEMENT PLATFORM SUPPORT DATA USE?
HOW DOES THE PLATFORM SUPPORT DISASTER RECOVERY?
What is Application Data Management?
What are the features of COMMVAULT’S UNIFIED SOLUTION?
HOW COMMVAULT HELPS THROUGHOUT THE APPLICATION LIFECYCLE PROCESS?
What are the Key features of Commvault?
What is Native Cloud Connectivity?
What does the Native Cloud Connector do?

Commvault Interview Questions And Answers

1) What is Commvault?

A) Commvault software assists organizations with data backup and recovery, cloud and infrastructure management, and retention and compliance.

Commvault software is an enterprise-level data platform that contains modules to back up, restore, archive, replicate, and search data. It is built from the ground-up on a single platform and unified code base.

Commvault Interview Questions # 2) How is data protected using Commvault?

A) Data is protected by installing agent software on the physical or virtual hosts, which use operating system or application native APIs to protect data in a consistent state.

Production data is processed by the agent software on client computers and backed up through a data manager, the MediaAgent, to disk, tape, or cloud storage.

All data management activity in the environment is tracked by a centralized server, the CommServe, and can be managed by administrators through a central user interface.

End users can access protected data using web browsers and mobile devices.

3) What are the different Enterprise Data Mangement Solutions of Commvault?

A) Commvault has different Enterprise Data Management Solutions, they are:

CLOUD DATA MANAGEMENT – Move, manage and use data effectively across multiple clouds and on-premises.

DATA VIRTUALIZATION – Manage virtual infrastructures as they grow and diversify, with scalable protection, rapid recovery, and self-service.

ENDPOINT PROTECTION – Secure and protect data at the network’s edge. Regain control and effectively manage the data that lives outside the datacenter.

APPLICATIONS – Drive availability and rapid recovery of applications, innovate faster, and automate the migration to the cloud.

COMMVAULT HYPERSCALE – Deliver the agility and business benefits of the cloud to your on-premises applications and data on a scale-out infrastructure.

4) WHAT AREAS OF DATA MANAGEMENT DOES THIS SYSTEM SUPPORT?

A) Commvault supports Data backup, Data recovery, Single view of on-premises and cloud data, Setting automated data policies, eDiscovery, Disaster recovery, GDPR readiness, Ransomware recovery options.

Commvault Interview Questions # 5) WHAT IS THE BREADTH AND DEPTH OF CLOUD SUPPORT?

A) Commvault supports various cloud platforms including Microsfot Azure, Amaxon AWS, Oracle Cloud, Google Cloud and Private Clouds.

Microsoft Azure

Azure Virtual Machines
Azure SQL Database
Azure Blob Storage (Hot and Cool and Archive)
Azure Data Box

Amazon AWS

Elastic Compute Cloud (Amazon EC2)
Relational Database Service (Amazon RDS)
Simple Storage Service (Amazon S3 & S3-IA)
Glacier
Snowball

Oracle Cloud

Oracle Cloud Infrastructure Object Storage (OCI)
Oracle Cloud Infrastructure Object Storage (S3 Compatible)
Oracle Cloud Infrastructure Archive
Storage Classic (OCIC)

Google Cloud

Nearline
Coldline
Regional
Multi-Regional

Private clouds

IBM
HPE
Rackspace
VMware

Real-Time Commvault Interview Questions

6) WHAT ARE THE DATA MIGRATION CAPABILITIES OF THE SYSTEM?

A) Move data to the cloud

Move data from the cloud
Move data across cloud storage – public or private
Built-in compression, deduplication, and encryption
Automation to define process flows across data projects
Orchestration from provisioning to validation
Native cloud integrations instead of proprietary gateways
Automated data archiving based on preset retention schedules

7) WHAT DATA MANAGEMENT CAPABILITIES ARE INCLUDED?

A) Manage data across on-premises data centers, public, and private clouds

GDPR readiness: detection of personal data for proactive data cleanup and data subject requests
Extend on-premises service level agreements (SLA) for policies to cloud
Apply consistent management policies as new data enters the environment

8) HOW DOES THE DATA MANAGEMENT PLATFORM SUPPORT DATA USE?

A) Users can discover and recover data across hybrid locations

Access data without restoring it; use data directly from the cloud repository

Single search for data indexing across on-premises and cloud storage

Quickly create new dev/test environments in the cloud using replicated data

9) HOW DOES THE PLATFORM SUPPORT DISASTER RECOVERY?

A) Manage disaster recovery across on-premises, public, and private cloud storage

Automate disaster recovery workflows with tested cloud management policies

Push-button disaster recovery processes to create cloud storage, data, and policies

Recover data and applications directly in the cloud or across platforms (physical-virtual-cloud)

Multiple recovery time objectives (RTO) and recovery point objectives (RPO) for different workloads

Commvault Interview Questions # 10) What is Application Data Management?

A) Commvault’s powerful application data management includes, application data protection and recovery solution.

Applications are managed throughout their lifecycle, accelerating the dev/test process for improved business agility, enabling the rapid recovery of production application data and the ability to meet stringent recovery SLAs, and improving application performance with data archiving while reducing your storage footprint, all using a single console that simplifies management.

Advanced Commvault Interview Questions

11) What are the features of COMMVAULT’S UNIFIED SOLUTION?

A) IMPROVE OPERATIONAL EFFICIENCY
• Automate and orchestrate data movement
• Improve staff efficiency with policy-based automation
• Use a single console and gain greater visibility into data

REDUCE COSTS AND IMPROVE UTILIZATION
• Reduce data sprawl with Active Copy Management*
• Accelerate dev/test process with automated delivery of copies
• Improve application performance and optimize storage with archiving

ACHIEVE GREATER AGILITY AND SCALE
• Scale seamlessly with broad application, cloud, storage and support
• Improve RTO/RPO with automated snapshots
• Protect and manage your data throughout its lifecycle

12) HOW COMMVAULT HELPS THROUGHOUT THE APPLICATION LIFECYCLE PROCESS?

A) DEV/TEST
• Reduce data sprawl with policybased automation
• Accelerate the dev/test process with self-service access (no waiting for provisioning or restores)

PRODUCTION
• Automate data movement to, from, within, and between clouds with automated workflows
• Use snapshots to rapidly recover data and meet stringent RTOs/RPOs

ARCHIVE/RETIRE
• Improve application performance and reduce production footprint with archiving
• Retire inactive databases, search archived data, and restore to vendor neutral format

Commvault Interview Questions # 13) What are the Key features of Commvault?

A) Commvault provides the industry’s fastest, easiest access to application data:

Gain crucial insights for developing fresh products and services
Ensure production copies remain secure

Automation: Commvault automates,

PROTECTION
RECOVERY
DISASTER RECOVERY
DATA REFRESH PROCEDURES FOR TEST/DEV

BETTER SNAPSHOTS

• Instant data refresh and recoveries
• Support for hardware snapshots and array replication to:
• Enhance DR execution
• Simplify compliance and reporting
• Improve and automate business and dev processes

INFRASTRUCTURE MODERNIZATION

COMPLETE COVERAGE FOR TODAY’S ESSENTIAL DATABASES AND BUSINESS APPLICATIONS, INCLUDING:

• Postgres
• Greenplum
• Salesforce
• NetSuite
• IBM
• Microsoft
• Oracle
• SAP

ADVANCED RECOVERY AND COPY FEATURES

Speed operations with instant access and native controls.

FEATURES FOR ALL YOUR DATA COPY CHALLENGES:

• Index operations on the fly at point of recovery
• Mount a data volume to access data in native format
• Recover in the background while accessing from the repository
• Create thin copies of databases for secondary use cases
• Mirror block changes for automated failover to an alternate site

Commvault Interview Questions # 14) What is Native Cloud Connectivity?

A) The Cloud Connector is the native integration within the Media Agent module that directly communicates with Azure’s Object Storage layer, without requiring translation devices, gateways, hardware appliances or VTLs.

Scenario-Based Commvault Interview Questions

15) What does the Native Cloud Connector do?

A) This Connector works by communicating directly with Object Storage’s REST API interface over HTTPS, allowing for Media Agent deployments on both Virtual and Physical compute layers to perform read/write operations against Cloud Storage targets, reducing the Data Management solution’s TCO.

Commvault Interview Questions # 16) Can you describe Scalability in Commvault?

A) Applications grow over time, and a Data Management solution needs to adapt with the change rate to protect the dataset quickly and efficiently, while maintaining an economy of scale that continues to generate business value out of that system.

Commvault Interview Questions # 17) What are De-duplication Building Blocks?

A) Commvault software maintains a Building Block approach for protecting datasets, regardless of the origin or type of data. These blocks are sized based on the Front-End TB (FET), or the size of data they will ingest, pre-compression/de-duplication. This provides clear scale out and up guidelines for the capabilities and requirements for each Media Agent.

De-duplication Building Blocks can also be grouped together in a grid, providing further deduplication scale, load balancing and redundancy across all nodes within the grid.

18) What is Client-side De-Duplication?

A) As is the nature of de-duplication operations, each block must be hashed to determine if it is a duplicate block, or unique and then must be captured. While this is seen as a way to improve the ingest performance of the data mover (Media Agent), it has the secondary effect of reducing the network traffic stemming from each Client communicating through to the data mover.

In public cloud environments where network performance can vary, the use of Client-side DeDuplication can reduce backup windows and drive higher scale, freeing up bandwidth for both Production and Backup network traffic.

19) Can you describe Crash Consistency vs. Application Consistency?

A) While Crash-consistency within a recovery point may be sufficient for a file-based dataset or Azure VM, it may not be appropriate for an Application such as Microsoft SQL, where the database instance needs to be quiesced to ensure the database is valid at time of backup. Commvault software supports both Crash and Application consistent backups, providing flexibility in your design.

20) Explain about Storage-level Replication vs. Discrete Copies?

A) Many cloud providers support replication at the Object Storage layer from one region to another, however, in the circumstance that bad or corrupted blocks are replicated to the secondary region, your recovery points are invalid.

Commvault Interview Questions For Experienced

21) How do you Decide What to Protect in Cloud?

A) Not all workloads within the Cloud need protection – for example, with microservices architectures, or any architecture that involve worker nodes that write out the valued data to an alternate source, mean that there is no value in protecting the worker nodes. Instead, the protection of the gold images and the output of those nodes provides the best value for the business.

Commvault Interview Questions # 22) What is Automation in Commvault?

A) The cloud encourages automation, not just because the infrastructure is programmable, but the benefits of having repeatable actions reduce operational overheads, bolster resilience through known good configurations and allows for greater levels of scale.

Commvault Interview Questions # 23) What is Programmatic Data Management?

A) Commvault software provides a robust Application Programming Interface that allows for automated control over Deployment, Configuration, Backup and Restore activities within the solution.

Whether you are designing a continuous delivery model that requires the automated deployment of applications, data collection and protection, or automating the refresh of a data warehouse or Dev/Test application that leverages data protection, Commvault software can provide the controls to reduce administrative overhead and integrate with your toolset of choice.

24) Can you describe Workload Auto-Detection and Auto-Protection?

A) The Commvault Intelligent Data Agents (iDA), whether the Virtual Server Agent for Azure, or the SQL Server iDA provide auto-detection capabilities to reduce administrative load.

Fresh instances, new volumes recently attached to a VM, or databases imported and created in a SQL instance are just examples of how Commvault software can automatically detect new datasets for inclusion in the next Data Protection window, all without manual intervention.

Even agent-inguest deployments can be auto-detected by Commvault and included in the next Data Protection schedule through intelligent Client Computer Groups.

This Auto-Detection and Auto-Protection level removes the requirement for a backup or cloud administrator to manually update the solution to protect the newly created datasets, improving your operational excellence and improving resiliency within your cloud infrastructure, ensuring new data is protected and recovery points maintained.

25) Explain about Self-Service Access and Restore?

A) A common task performed by system administrators is facilitating access to recovery points for end-users and application owners, shifting their attention away from other day-to-day operations and strategic projects.

Commvault software’s self-service interfaces empower users to access their datasets through a Web-based interface, allowing security mapped access to individual files & folders within the protected dataset, freeing up administrators to work on critical tasks.

Frequently Asked Commvault Backup Interview Questions and Answers

Commvault Interview Questions # 26) What is Azure Virtual Network?

A) Azure has the capability to establish an isolated logical network, referred to as an Azure Virtual Network (AVN).

Virtual Machines deployed within a AVN by default have no access to Public Internet, and utilize a subnet of the Customer’s choice.

Typically AVN’s are used when creating a backbone between Virtual Machines, and also when establishing a dedicated network route from a Customer’s existing on-premise network directly into Azure via Azure ExpressRoute.

Commvault Interview Questions # 27) What is Data Seeding?

A) Data Seeding is moving the initial set of data from its current location to a cloud provider in a method or process that is different from regular or normal operations.

28) Explain Compression vs. De-duplication?

A) It is recommended that De-duplication should be used where possible, with the exception of environments where there are significant bandwidth concerns for re-baselining operations, or for Archive only use cases.

While additional compute resources are required to provide the necessary foundation for optimal De-duplication performance, using De-duplication even in a cloud context can still achieve greater than a 10:1 reduction.

29) How do you use Workflow to Automate DR?

A) The Commvault Workflow engine provides a framework in which the DR runbook process, covering the deployment of new instances, recovery of data and applications, and validation aspects of a DR operation can be automated to deliver a simplified, end-to-end GUI-driven DR process.

30) What is Continuous Data Replicator (CDR)?

A) CDR allows near time continuous data replication for critical workloads. Replication can be configured as Direct Replication (1:1 source to destination host), or as a Fan-in or Fan-out based replication configuration.

When to use CDR approach:

Fan-in replication of File data-sets from Remote regions to a Cloud-based host – CDR supports a fan-in based replication approach (Many-to-1) in which data from remote sites can be replicated into a target Cloud-based host

Guest-level Replication of File and SQL/Exchange data-sets – CDR can be used to perform asynchronous block-based replication of File, SQL and Exchange datasets between hosts, irrespective of the source/destination hardware/hypervisor and storage. This allows data to be kept in-sync between an on-premise host and a cloud-based host. Source

Peoplesoft Admin Interview Questions And Answers 2018

Top Peoplesoft Admin Interview Questions And Answers 2018. Here Coding compiler sharing a list of 30 interview questions on Peoplesoft Admin. These Peoplesoft admin questions were asked in various interviews conducted by top MNC companies and prepared by expert Peoplesoft professionals. All the best for your future and happy learning.

Peoplesoft Admin Interview Questions

What is PSADMIN in Peoplesoft?
What elements are there in PSADMIN?
What does PSADMIN do?
What are the Analytic Servers?
Can you give example scenario for Analytic Server?
PeopleSoft supports which Web Servers?
Why do we use WebLogic server in PeopleSoft?
What is Single server definition in Weblogic Server?
What is Multi server definition in Weblogic Server?
What is Distributed managed server definition in Weblogic Server?
What is WebLogic Server Administration Console?
How can you start WebLogic on Microsoft Windows?
How do you uninstall the Weblogic server?
How do you start WebLogic on UNIX?

Peoplesoft Admin Interview Questions And Answers

Peoplesoft Admin Interview Questions
What is PSADMIN?	PSADMIN for managing application server domains.
PeopleSoft Supports	Oracle WebLogic and IBM WebSphere web servers.
Tuxedo in Peoplesoft	Tuxedo is a transaction based Application Server.
User ID and Passwords	Are stored in PSOPRDEFN Table.
JVM Heap	Is the amount of memory that a particular JRE gives to the JVM that it creates.

Peoplesoft Admin Questions And Answers

1) What is PSADMIN in Peoplesoft?

A) You use PSADMIN for managing application server domains, PeopleSoft Process Scheduler domains, integration server processes, search domains, and so on. PSADMIN also enables you to configure and manage the behavior of servers with respect to a wide range of PeopleTools infrastructure elements.

2) What elements are there in PSADMIN?

A) PSADMIN consists of various PeopleTools infrastructure elements, including,

Tuxedo and Jolt.
PeopleCode debugging.
Caching.
Analytic server framework.
Transactional SQL requests.
Performance enhancement.
PeopleSoft Query.
Integration Broker.
Email.
Real-time event notification.
Performance Monitor.
MultiChannel Framework.

Peoplesoft Admin Interview Questions # 3) What does PSADMIN do?

A) PSADMIN simplifies the process of configuring and administering all of the server processes and features that are available for PeopleSoft servers. For example, you use PSADMIN to configure application server domains, Process Scheduler servers, PIA domains, and search servers.

Peoplesoft Admin Interview Questions # 4) How can you launch PSADMIN?

A) By using PS_HOME\appserv\psadmin.exe from the command line, we can launch the PSADMIN.

Peoplesoft Admin Interview Questions # 5) What are the Analytic Servers?

A) The analytic server framework provided by PeopleSoft is a general server infrastructure designed to meet the needs of PeopleSoft products that process large amounts of data in memory.

It provides a stateful model of client/server connectivity that these products require to be part of the PeopleTools system, by keeping track of configuration settings, transaction information, and other data for a session.

6) Can you give example scenario for Analytic Server?

A) For example, client software could request that an analytic model or optimization model be recalculated in one transaction, then retrieve the results of the calculation on that model at a later time.

A server process handles these requests and maintains the model state and calculated data in memory between the requests. Additional transactions can then modify the model and perform recalculations on it without shuffling all of the data between the client and the server or dumping all the data into a database, thus preserving in-memory performance.

Peoplesoft Admin Interview Questions # 7) PeopleSoft supports which Web Servers?

A) PeopleSoft supports Oracle WebLogic and IBM WebSphere web servers, which provide the same basic functionality to support PeopleSoft applications, including a console interface, secure sockets layer (SSL), and reverse proxy servers (RPS).

Each web server has its own way of accomplishing its functionality, and each adds its own extra features that you might find useful to your PeopleSoft system. This PeopleBook provides supplemental information about configuring and administering the web servers where it has particular relevance to PeopleSoft.

8) Why do we use WebLogic server in PeopleSoft?

A) We use the Oracle WebLogic Server as a web server in the PeopleSoft Internet Architecture to deploy PeopleSoft applications. The PeopleSoft Internet Architecture installation on the WebLogic Server provides these primary server configuration options.

9) What is Single server definition in Weblogic Server?

A) This domain configuration contains one server named PIA, and the entire PeopleSoft application is deployed to it. This configuration is intended for a single user or very small scale, non-production environments.

10) What is Multi server definition in Weblogic Server?

A) This domain configuration contains seven unique server definitions and a WebLogic cluster, and the PeopleSoft application is split across multiple server instances on a single machine. This configuration is intended for the production environment.

Advanced Peoplesoft Admin Interview Questions

11) What is Distributed managed server definition in Weblogic Server?

A) This option is an extension of the “Multi server” selection and installs the necessary files to boot managed servers spread across multiple machines. This option requires a “Multi server” installation to be performed to some other location that contains the configuration for this managed server.

12) What is WebLogic Server Administration Console?

A) The WebLogic Server Administration Console is the main utility that is used to administer and monitor the WebLogic server processes.

The Administration Console provides an interface to monitor and configure aspects of a PeopleSoft application from a web server perspective.

Access the Administration Console by pointing your browser to:

http://<server>:<port>/console

For example,

http://server08.us.oracle.com:80/console

Where the port is the port on which your PeopleSoft Internet Architecture domain is listening.

If it is a multi server installation the Administration Console from the Admin Server is always running on port 9999. For accessing the Administration Console in a multi server installation, the URL is:

http://<server>:9999/console

Before the Administration Console opens, you will be prompted for the WebLogic administration ID and password that you specified during the PeopleSoft Internet Architecture installation.

13) How can you start WebLogic on Microsoft Windows?

A) On Microsoft Windows, you can start WebLogic using: command prompt and Windows service.

Using the Command Prompt:

Running WebLogic as a foreground process is beneficial if you need to monitor WebLogic in real time. To run WebLogic as a foreground process, enter one of the following commands at the command prompt in PIA_HOME\webserv\domain\bin.

Single server – startPIA.cmd Or, you can use the PSADMIN PIA domain menu options.
Multi server – domain admin server – startWebLogicAdmin.cmd
Multi server – managed server – startManagedWebLogic.cmd server

For example, startManagedWebLogic.cmd PIA

Using the Windows Service

Benefits of running WebLogic as a Windows service include:

WebLogic can automatically start when the Windows server boots.

You can start and stop the service from a remote Windows machine.

To install the service, open the command prompt, and enter the appropriate command from your PIA_HOME\webserv\domain\bin directory:

Single server – installNTservicePIA.cmd

Multi server – InstallNTservice.cmd weblogic_server_instance_name

For example: installNTservice.cmd PIA

To start WebLogic as a Windows service, you can:

Start the service named WebLogicdomain-servername (for example, peoplesoft-PIA) by using the Services utility in the Windows Control Panel.

Start the service from a command prompt by entering the following command: NET START peoplesoft-PIA

Peoplesoft Admin Interview Questions # 14) How do you uninstall the Weblogic server?

A) To uninstall the service, enter the following command:

uninstallNTservicePIA.cmd

Peoplesoft Admin Interview Questions # 15) How do you start WebLogic on UNIX?

A) To start PeopleSoft on UNIX execute the appropriate script in the WebLogic domain directory that the PeopleSoft install created, as in PIA_HOME/webserv/peoplesoft/bin.

Single server – startPIA.sh
Multi server – domain admin server – startWebLogicAdmin.sh
Multi server – managed server – startManagedWebLogic.sh server

For example, startManagedWebLogic.sh PIA

16) How do you stop WebLogic Using the Command Line?

A) To stop WebLogic using the command line, enter the appropriate command.

Configuration – Windows – UNIX
Single server – stopPIA.cmd – stopPIA.sh
Multi server (WebLogic Admin server) – stopWebLogic.cmd – stopWebLogic.sh
Multi server (Managed WebLogic server) – stopWebLogic.cmd <ManagedServerName> – StopWebLogic.sh <ManagedServer Name>

Peoplesoft Admin Interview Questions # 17) How can you control WebLogic server life cycle?

A) control a WebLogic server’s life cycle primarily using a collection of scripts provided in that server’s WebLogic domain directory.

Each instance of a WebLogic server runs in an isolated Java Runtime Environment (JRE), regardless of whether you’re testing with a single-server configuration or implementing a multi-server configuration for production. All scripts must be launched from the WebLogic domain directory; and provide usage syntax if run with –help.

Peoplesoft Admin Interview Questions # 18) What is JVM Heap?

A) The JVM heap size is the amount of memory that a particular JRE (Java Runtime Environment) gives to the JVM (Java Virtual Machine) that it creates.

The java.exe command on Windows, java on UNIX and beasvc.exe when running WebLogic as a Windows service is the JRE, and the JVM exists within the JRE’s memory space. The primary sources for monitoring the amount of memory that is in use within a JVM are the Administration Console and the WebLogic logs.

Peoplesoft Admin Interview Questions # 19) How can you change the JVM Heap Size?

A) If you need to adjust any of the Java options, most commonly the JVM heap size, you must manually edit that WebLogic domain’s local setEnv script. The parameters, -Xms and -Xmx, control the JVM memory minimum and maximum heap size respectively.

20) What is PeopleSoft Configuration Manager?

A) PeopleSoft Configuration Manager is a Microsoft Windows application that simplifies development workstation administration by enabling you to adjust PeopleSoft registry settings from a central location.

You can set up one development workstation to reflect the environment at your site, then export the configuration file, which can be shared among other workstations. You can also define separate profiles for connecting to different PeopleSoft databases.

Peoplesoft Admin Interview Questions For Experienced

21) What are the PeopleSoft configuration parameters?

A) PeopleSoft configuration parameters are grouped on the Configuration Manager pages according to the function, feature, or tool that they control, including:

Startup settings.
Display settings.
Crystal report and Business Interlink settings.
Trace settings.
Workflow settings.
Remote call settings.
Developer workstations.
Importing and exporting environment settings.
Defining configuration profiles.

22) What is the use of PeopleSoft Configuration Manager?

A) PeopleSoft Configuration Manager simplifies Windows workstation administration by enabling you to adjust PeopleSoft registry settings from one central location.

It contains a variety of controls that let you set up Windows workstations running development and administrative applications, such as Application Designer and Data Mover.

You can set up one workstation to reflect the environment at your site, and then export the configuration file, which can be shared among all the workstations at your site.

You can also define separate profiles for connecting to different PeopleSoft databases. PeopleSoft configuration parameters are grouped on the Configuration Manager tabs according to the function, feature, or tool that they control.

23) What are the common Elements in PeopleSoft Configuration Manager?

OK – Saves your settings and exits PeopleSoft Configuration Manager.
Cancel – Closes PeopleSoft Configuration Manager without saving any changes that you have made.
Apply – Saves your changes without exiting.

Peoplesoft Admin Interview Questions # 24) How can you launch Configuration Manager?

A) At a command prompt, enter:

PS_HOME\bin\client\winx86\pscfg.exe

Peoplesoft Admin Interview Questions # 25) What is PeopleSoft Server Process Logs?

A) For each PeopleSoft server process, such as PSAPPSRV, the system writes an individual log file to your specified logs directory.

Depending on the logging level, these log files can contain varying amounts of information. Reviewing these log files regularly can help you to identify potential issues or system trends, and they are a valuable source of information when troubleshooting.

To understand the log information, it is helpful to be able to identify the various log fields that the system writes to an individual line in the log file.

26) Can you give an example of PeopleSoft Server Process Logs?

A typical log file contains these log fields:

[Server Process]:[Operating System Process ID] [Service Request Number] [Timestamp] [Log Level] [Message]

PSAPPSRV.5648 – (993) – [2012-12-12T11:54:23.778] – (3) – Authenticate User not needed. New User Id/Password same as current.

Peoplesoft Admin Interview Questions # 27) How can you configure PeopleCode Trace?

A) Select PeopleTools, Utilities, Debug, Trace PeopleCode to access the Trace PeopleCode page.

You use this page to change the PeopleCode tracing options while online. This page does not affect trace options that are set in PeopleSoft Configuration Manager.

Use Trace PeopleCode to create a file displaying information about PeopleCode programs processed from the time that you start the trace.

Peoplesoft Admin Interview Questions # 28) How can you configure SQL Trace?

A) Select PeopleTools, Utilities, Debug, Trace SQL to access the Trace SQL page.

You use this page to change the SQL tracing options while you’re online.

Peoplesoft Admin Interview Questions # 29) What is IDDA Logging?

A) The PeopleSoft Instrumented Development Diagnostic Aid (IDDA) logger, enables you to gather specific information about various areas within the PeopleSoft Internet Architecture and PeopleSoft Interaction Hub.

30) What are PeopleTools Utilities and what it contains?

A) The PeopleTools utilities are a set of various configuration and administration interfaces that serve as a browser-based method of setting numerous system settings.

These utilities, most of which are available through the PeopleTools utility menu, provide the ability to configure, maintain, or launch a wide range of features, including:

The System Information page.
The message catalog.
The spell check dictionary.
Translate values.
Application server caching.
SQR customization.
Table management and sharing.
Backward compatibility.
Remote database connection.
File attachments.
Stored URLs.
Mobile data synchronization (deprecated).
Update tracking.
Platform-specific database features.
Database auditing.
International settings.
Optimization utilities.
PeopleSoft Ping. Source

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