Top 30 Python Interview Questions

by Monika Dadool 29-May-18

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There are huge job openings for Python Developer in IT Industry nowadays. Coding Tag published this article contained Compiled python interview questions for machine learning, Python developer, data analyst or machine language tester related interview.

1) What is Python Programming?
Python is a powerful interactive, interpreted high-level object-oriented scripting language. Python can be referred as the general purpose language as it can be used for multiple purposes. It is very easy to learn as a comparison to other languages like Perl, Java, C and C++.

2) Applications of Python
* Artificial Intelligence
* Natural Language Processing
* Embedded Scripting
* Website Applications (server-side)
* Image Processing
* Servers to Design Web Applications
* Software Development
* Complex Scientific Mathematical Problems

3) Who Discovered Python?
Guido Van Rossum Developed python in 1989 but officially it was available to Public in 1991.

4) Name the list of the company using Python language?
* YouTube
* Google
* Drop box
* BitTorrent

5) Features of Python?
* To learn Python language is simple as it contains very simple syntax resembling English language.
* Python can be handled with an object-orientated method, procedural method, or a functional method.
* Python is dynamically typed.
* Python provides user-friendly data structures.
* Python is open source language freely available in official site.
* Python is easily understandable and easily coordinate with other languages like C and C++.
* In Python, there is no need to manually memory allocation as it contains automatic memory management.
* We need to write less code as a comparison to Java and C.
* As Python is supported by many platforms including BeOS, WindowsCE, PlayStation, Amiga, Linux made it portable.
* Networking Applications.
* Platform Independent.
* Data Analysis.

Top 30 Python Interview Questions

Free Download PDF = Python Interview Questions

6) Explain the extensibility of Python?
Python is extendable to many popular languages like .net, C++ libraries, Java and C components, Python can be integrated.

7) What do you mean by identity operators in Python?
You can determine the class and type of a value in Python with Identity operators. 'is' operator and 'is not' operator are two different identify operators found in Python. These operators are very helpful when we are writing large code and we have forgotten or not sure about the current value. We can check the values by identity operators for e.g. if we have declared >>x=89 and we have forgotten whether x is declared or not. We can check it by >>xis89 If it is identical then it returns true if it is not identical then it will return false.

For example



8) What is the function of membership operators in Python?
These are used to test whether the value is in sequence. "in" and "not in" operators are two membership operators found in Python.

9) What do you mean by repeating String Operation in Python?
In Python, If we want to repeat the string we need * Operator

For e.g.


It repeats "codingtag" five times.

10) What are the Difference between Deep copy and Shallow copy? This is one of the basic python interviews asked by recruiter.

Deep Copy
Shallow Copy
Deep copy slower execution
Allows execution fast
Copies all the field
Only references are copied

Already copied the value of data is stored    
If we make any modifications in the original copy does not affect other copy

11) Suppose we want to print "Coding Tag" in Python, what is the code we have to write in python as compare to Java or C++. Is it require less code?
Python requires only one line code as compared to other high-level languages like C++ and Java.


public class CodingTag {
public static void main(String[] args) {
// Prints "Coding, Tag" in the terminal window.
System.out.println("Coding, Tag");


using namespace std;

// main function -
// where the execution of program begins
Int main()
cout<<"Coding Tag";
return 0;

print('Coding, Tag!')

12) In Python, you can use one line to print "Coding Tag" Is it possible in Java?
Jshell can be used to facilitate this. But this facility came in Java 1.9 on 21 Sep 2017.

13) Is Python is dynamically typed programming?
Yes, Python has dynamically typed programming language as compared to C++ and Java that is a static programming language. For e.g.

Int a=6; (wrong in python)

We don't require declaring the type in python.

14) In a Python code, Semicolon is mandatory?
Such terminology is not required in Python.

15) Name some languages from where Python borrowed features?
Guido Van Rossum borrowed many features from existing languages like Modula-3, PERL and SHELL, C and C++. Modular programming features from the Modula-3, scripting languages features from PERL and SHELL, Object Oriented Programming and Functional Programming from C++ and C.

16) How many reserved words are found in python?

17) Suppose we have on Python program "A" in windows. Is it possible to migrate it from windows to MAC?
With portability features of Python program, we can migrate from one platform to other without performing any modification in the program.

18) Which function can be used to get all the values of objects present in dictionary?

19) List any disadvantages of Python?
On performance base python show low performance as a comparison to Java. Python is not yet used for Developing Mobile Applications

20) List Flavors of Python?
Following are the list of flavors of Python:
* Jython
* Anaconda Python
* PyIMSL Studio
* IronPython
* Pypy
* ActiveState ActivePython
* Stackless Python
* Pythonxy
* Portable Python

21) Decorators in Python?
There is a very effective feature found in Python to add additional functionality to our existing code or at compilation time a programmer can do modification in another part of the code can be called as Meta programming.

22) What do you mean by Dictionary in Python and its implementation?
Dictionary is quite identical to Map and Hash used in another language. Python, Dictionary is known as a collection of inbuilt data types. It subsists on pairs of the key value. Dictionaries are implemented with the use of Hash Tables and hash function are used to obtain the indexes. The quality of Hash function define the collisions.

23) Give any Limitation of the big dictionary in Python?
There is only one limitation of bigger dictionary is memory issue it consumes extra memory.

24) Pipes used in Python?
Pipes can be referred as chaining process. The output of one process is made to be the input of other processes, in other words, the elements are joined together with pipes. There are two types of pipes are available in python i.e. Named pipes and Anonymous pipes. The main advantage of the pipe is it simplifies data sharing.

25) Monkey patching in Python?
Monkey patch can be referred to as a part of the code that can be used to do modification in  another code. Monkey patching appears during run-time. If we don't have any authority to do any modification in the source code, you can modify functions inside some methods or element of classes with Monkey patching.

26) Python is Case Sensitive language. Right or Wrong?

27) What is the output of print(str*3) if str ="CodingTag"?
It prints string three times.
Output: CodingTagCodingTagCodingTag.

28) What is the output of print(str[0]) if str ="python software"?
The output will be p.

29) dictionary.keys() function in Python?
dict.keys() return object to visualise all keys present in the dictionary.

30) The function of len(string) in Python?
The length of the string can be returned with this function.

These are the top 30 python interview questions. Students are recommended to go through these python interview questions for data analyst, tester interview. To learn python online along with examples, we have prepared Python course for the beginners.



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