October 10, 2018

Sreekanth B

EXL Service Most Frequently Asked Python Latest Interview Questions Answers

How will you get the index of an object in a list?

list.index(obj) − Returns the lowest index in list that obj appears.

How will you insert an object at given index in a list?

list.insert(index, obj) − Inserts object obj into list at offset index.

How will you remove last object from a list?

list.pop(obj=list[-1]) − Removes and returns last object or obj from list.

How will you remove an object from a list?

list.remove(obj) − Removes object obj from list.

How will you reverse a list?

list.reverse() − Reverses objects of list in place.
EXL Service Most Frequently Asked Python Latest Interview Questions Answers
EXL Service Most Frequently Asked Python Latest Interview Questions Answers

How will you sort a list?

list.sort([func]) − Sorts objects of list, use compare func if given.

Q97).Name five modules that are included in python by default (many people come searching for this, so I included some more examples of modules which are often used)

datetime           (used to manipulate date and time)
re                         (regular expressions)
urllib, urllib2  (handles many HTTP things)
string                  (a collection of different groups of strings for example all lower_case letters etc)
itertools            (permutations, combinations and other useful iterables)
ctypes                (from python docs: create and manipulate C data types in Python)
email                  (from python docs: A package for parsing, handling, and generating email messages)
__future__      (Record of incompatible language changes. like division operator is different and much better when imported from __future__)
sqlite3               (handles database of SQLite type)
unittest             (from python docs: Python unit testing framework, based on Erich Gamma’s JUnit and Kent Beck’s Smalltalk testing framework)
xml                     (xml support)
logging              (defines logger classes. enables python to log details on severity level basis)
os                        (operating system support)
pickle                (similar to json. can put any data structure to external files)
subprocess    (from docs: This module allows you to spawn processes, connect to their input/output/error pipes, and obtain their return codes)
webbrowser  (from docs: Interfaces for launching and remotely controlling Web browsers.)
traceback       (Extract, format and print Python stack traces)

Name a module that is not included in python by default

mechanize

django
gtk
A lot of other can be found at pypi.

What is __init__.py used for?

It declares that the given directory is a  package. #Python Docs (From Endophage‘s comment).

How do you print the sum of digits from 1 to 50 in Python?

print(sum(range(1,51))

This command would print in the sum of digits from 1 to 50

What is PEP 8 in Python?

PEP 8 is a set of recommendations about writing Python Code so as to make it readable and useful for other programmers. It is more of a coding convention.
45. What is a Decorator in Python?

Decorators allow you to wrap a method or a class function that executes a set of code lines before or after the execution of the original code. Decorator also allows to inject or modify code in methods or classes.

What is Django Framework in Python?

Django is a high-level Python framework which is used primarily for Web Development. This framework encourages fast and efficient development with pragmatic and clean design. Built by experienced developers, it takes care of much of the hassle of Web development, so you can focus on writing your app without needing to reinvent the wheel. It’s free and open source.

Is Python a Compiled or an Interpreted Programming Language?

Python programs have the extension .py. These source files are first compiled to Byte Codes (which does not contain the binary codes). These Byte Code files helps in startup speed optimization. These byte-codes are then sent to the Python Virtual Machine where lines of codes are read one after another which means that it is interpreted.

Enlist the Non-Mutable Built-in types in Python programming environment?

The Non-Mutable Built-in types in Python Programming Environment are as follows:

1. Tuples
2. Numbers
3. Strings

How can we define Scope in a Python program?

Python programming environment does not support the use of Braces for Defining Scope for a variable or a method. However, it uses Indentations to let the Python interpreter decide the scope itself. Proper indentations, if not used will normally generate an error.

Enlist various Exceptions identified by Python?

The various exceptions identified by Python Environment are as follows:
1. IOError
2. IndexError
3. KeyError
4. NameError
5. SyntaxError
6. ValueError
7. TypeError.

What Are The Rules For Local And Global Variables In Python?

In Python, variables that are only referenced inside a function are implicitly global. If a variable is assigned a new value anywhere within the function's body, it's assumed to be a local. If a variable is ever assigned a new value inside the function, the variable is implicitly local, and you need to explicitly declare it as 'global'.
Though a bit surprising at first, a moment's consideration explains this. On one hand, requiring global for assigned variables provides a bar against unintended side-effects. On the other hand, if global was required for all global references, you'd be using global all the time. You'd have to declare as global every reference to a builtin function or to a component of an imported module. This clutter would defeat the usefulness of the global declaration for identifying side-effects.

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