Top 15 Python Interview Questions with Answers

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Python is one of the most widely used programming languages in today’s world. It is being used in almost every industry as by the top companies for their programming needs. In this blog, we will take a look at some of the commonly asked Python interview questions. In case you are looking for a job as a python developer, it is important to learn these python interview questions and prepare well for the interview. Let’s get started!

Important Python Interview Questions with Answers

1. What is Python?

Python was created by Guido van Rossum and released in 1991. It is a high-level, interpreted, interactive, and object-oriented scripting language which can run equally on different platforms such as Windows, Linux, UNIX, and Macintosh. The main areas where Python is used most are data science, machine learning, Game development and artificial intelligence.

2. What are the key features of Python?

The key features of Python are:

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  • It has a very simple syntax.
  • It is a dynamically typed language, so there is no need to declare a variable with the data type.
  • It is free and Open-source.
  • Python is compatible with different platforms such as Windows, Mac, Linux etc.
  • It is easy to learn.

3. What are the applications of Python? 

  • Web Development
  • Game Development
  • Scientific and computational applications
  • Image processing and graphic design applications
  • Enterprise and business applications
  • Operating systems
  • GUI based desktop applications

4. What are the advantages of Python?

Python has many advantages: 

  • Easy to read and write
  • It is a dynamically typed language
  • Portable and easy to use
  • Free and Open-source
  • Interpreted
  • Huge support of Libraries
  • Object-oriented
  • Readability

5. What are Literals? Explain different types of Literals?

Literals are the data that is given in a variable or constant. Following are the types of Literals in Python:

  • String Literals: It is a sequence of characters. It can be a single, double and triple string.
  • Numeric Literals: These belong to three different types – integer, float and complex.
  • Boolean Literals: They are in the form of “True” and “False”, which represents ‘1’ and ‘0’ respectively. 
  • Special Literals: Special literals are used to classify fields that are not created and represented by the value ‘none’.

6. What are Python comments? How can you add comments in Python?  

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Comments are the annotations in the source code of a programmer. It helps to make the source code easier to understand. It is normally ignored by the interpreter. There are two types of Comments are used in Python:

  • Single-Line Comment
  • Multi-Line Comment

7. List the difference between tuples and lists. 

Both List and Tuple can store any type of data in it. But yes still there are differences too:

The list is mutable, i.e., a list can be changed when it is created, whereas a tuple is immutable, i.e., tuple can’t be changed after its creation.

  • Tuples are denoted by using parentheses (), whereas Lists are denoted by using square brackets [ ].
  • The list‘s length can vary, but the tuple’s length is fixed.

8. What is a dictionary in Python? Give an example.

Dictionaries are generally used to store the data in key: value pairs. It is an unordered and modifiable collection of items. They are denoted and enclosed by curly braces { }.

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Syntax : {key1:value1, key2:value2}

Example : {1:’a’, 2:’b’}

9. How can you insert an element at a given index in Python?

Python has an inbuilt function called insert() to insert an element at a particular index in a list.

Syntax: list_name.insert(index, element)

Example: l = [a,b,c,d,e,f,g,h]
#insert ‘p’ at 5th index
list.insert(5, ‘p’)
Output – [a,b,c,d,e,p,f,g,h] 

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10. What is the difference between tuple and dictionary?

The main difference between tuple and dictionary is that a dictionary is mutable while a tuple is not. It means the content of the dictionary can be changed but in tuple it’s not possible.

11. What is passed in Python?

Pass is a statement used when you do not want any command to execute but a statement is required. It is a Null statement and not generally ignored. 

12. What does len() function do?

 len() function used to find the length of a data type in Python like string, list, tuple etc.

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for ex : str = “Python Interview Questions”

print(len(str))

Output – 26

13. What is the use of type () in Python?

Type() function returns the data type of an object .

For ex: s = “Python Interview Questions”

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Print(type(s))

Output – <class ‘str’>

14. How does the Python program work?

Python is an interpreted language. It takes the following steps to execute a python program:

  • First, the python code reads by the interpreter, where it checks the syntax of each code line by line. If there is any error, it immediately shows an appropriate error message.
  •  If everything works fine, then the interpreter converts the code into a specific format called Bytecode. But the problem is that Bytecode can’t be understood by the CPU. So it requires another interpreter called a Python Virtual Machine(PVM).
  • Finally PVM executes the Byte Code and provides the Output.

15. If you want to lowercase a string, how can you do that?

To lowercase a string, we can use a lower() string function. 

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For ex : s = “PYTHON INTERVIEW QUESTIONS”

Print(s.lower())

Output: python interview questions This brings us to the end of the blog on commonly asked Python Interview questions. We hope that these questions helped you and you were able to gain some insights. Prepare well with these Python interview questions and all the best for your upcoming interview. 

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