Basic Python Interview Questions and Answers

python interview

Hello Techies,

If you get a call for a Python interview, the question that comes to your mind after the call is, How do I prepare for a Python interview?

In this blog, I’m going to discuss some basic python interview questions that are asked in the python interview process.

In my previous blog, I have covered questions on the Python Interview Programs.

Top Python Interview Questions and Answers:

#1. What is Python?

Python is an object-oriented programming language with objects, classes, modules, threads, exceptions, function, and automatic memory management. It is a simple but powerful programming language. It can run on a different operating system like Windows, Linux, Unix, etc. Python also provides, various frameworks like Django, Flask, Pyramid are also available.

#2. What are the advantages of Python?

Following are the main advantages of using Python.

  • Free and open source
  • Portable
  • Extensible
  • Object-oriented
  • Built-in data structure.

#3. What is PEP 8?

PEP8 is a coding convention that sets out a set of guidelines on how to write your Python code more readable.

#4. What do you mean by Python Literals?

Python literals can be defined as data that is given in constant or variable.
There are 5 types of literals in Python:

  • String Literals
  • Numeric Literals
  • Boolean Literals
  • Special Literals
  • Literal Collections

#5. Explain Python Functions

A Python function is a section of the program or a block of code that is written once and can be executed whenever required in the program.
There are 2 types of functions:

  • Built-In Functions
  • User-defined Functions

#6. What is the Python zip() function?

The Python zip() function is used to convert multiple lists, i.e. list1, list2, list3, etc., into a single list of tuples by taking the corresponding elements of the lists provided as parameters.

#7. What is Python’s parameter passing mechanism?

There are 2 parameters passing mechanism in Python:

  • Pass by references
  • Pass by Value

By default, all the parameters are passed ‘by reference’ to the functions. If you change the value of a parameter in a function, this change will be reflected in the calling function.

The pass by value is that whenever we pass the arguments to functions that are of type say number, strings, tuple. This is due to their immutable nature.

#8. How to overload constructors or methods in Python?

Python Constructor: __init__ () is the first method in the class. Whenever we try to instantiate an object, __init__ () is prompted by Python to automatically initiate members of the object.

#9. What is Web scraping? How would you achieve web scraping in Python?

Web scraping is a method of extracting large amounts of information available on websites and saving it on a local machine or database tables.
In Python, there are some modules for web scraping:

  • Urllib2
  • Scrappy
  • Pyquery
  • BeautifulSoap etc.

#10. Which are the file related libraries/modules in Python?

Python provides libraries/modules with functions that allow you to handle text files and binary files on the file system. Using this library you can create files, update their contents, copy and delete files. These libraries are os, os.path, and shutil.

Both os and os.path libraries include functions for accessing the filesystem.
The shutil Library is used to copy and delete files.

#10. What are the different file processing modes supported by Python?

Python provides 3 modes to open files:

  • Read-only mode
  • Write-only mode
  • Read-Write mode

#11. Which are the different types of operators in Python?

Following is a list of operators in Python:

  • Arithmetic Operators
  • Relational Operators
  • Assignment Operators
  • Logical Operators
  • Membership Operators
  • Identity Operators
  • Bitwise Operators

#13. What is used to create a Unicode string in Python?

You should use ‘Unicode’ before the string. For eg, Unicode(text)

#14. Explain how Python is Interpreted?

Python is an Interpreted language.
The Python language program runs directly from source code. It converts the source code into an intermediate language, which is then translated into machine language that needs to be implemented.

#15. What is an operator in Python?

An operator is a particular symbol that is used on some values and produces an output as result.

For example:
Here ‘+’ and ‘=’ are operators.

#16. Python is dynamic typed?

Yes, it is. Python is a dynamically typed language. What is dynamic?
We do not need to declare a variable type when assigning a value to a variable in Python.
Other languages ​​like C, C ++, Java etc. They have a strict declaration before giving values ​​to the variables.

For example, if we write a list and print the type of a particular variable, it will return the type of that particular variable.

#17. What is Ordered Dictionary?

OrderedDict is a subclass of dict objects in Python. The only difference between OrderedDict and dict is that it maintains the order of the keys as they are inserted in OrderDict.

#18. What is Namespace in Python?

Namespace is a system that has a unique name for each object in Python. An object can be a variable or a method.
Python itself puts namespaces in the form of the Python dictionary.

#19. Difference between sort and sorted?

The primary difference between the list sort() function and the sorted() function is that the sort() function will change the list to which the call is made.
The sorted() function will create a new list containing a sorted version of the list given to you.

#20. Difference between list and tuple?

  • Both lists and tuples are data structures in Python.
  • While the list is mutable, the tuples are immutable, and this makes the difference between the two.
  • The tuple is faster than the list.

#21. Why Tuples are faster than list?

Tuples are stored in one block of memory. Tuples are immutable, so no extra space is needed to store new items. Lists are divided into two blocks: a fixed one with all Python object information and a variable sized block for data. This is why creating a tuple is faster than listing.

#22. What data types does Python support?

Below are the data types that Python supports:

  • String
  • Integer
  • Float
  • Set
  • Tuple
  • List
  • Dictionary
  • Boolean

#23. What is the difference between module and package in Python?

Package is a collection of Python modules and the module is a single Python file.

#24. Explain the Python list Comprehension?

List Comprehension is a way to declare a list in a single line of code. For example, list1 = [i for i in range(100)]

#25. What is difference between is and == in python

The equity operator (==) compares the values of both operations and checks for value equality and is operator checks whether both operators refer to the same object or not.

Practice these questions before your python interview, it will definitely help in cracking your python interview.

All The Best!!!

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