How to Prepare for a Python Interview

Python has become the most popular programming language in the world and is one of the most in-demand languages by employers. It is a widely used high-level interpreted programming language. Its design philosophy emphasizes code readability and its syntax allows programmers to express concepts in fewer lines of code than would be possible in languages such as C++ or Java. The language provides constructs intended to enable clear programs on both a small and large scale.

As such, if you’re a Python programmer, you’re likely to face stiff competition when applying for jobs. In order to increase your chances of landing an interview, it’s important to be well prepared. In addition, if you are a data scientist, these tips will be of help. Here are some tips on how to prepare for a Python interview.

Know the Basics Inside Out

This may seem like an obvious one, but it’s important that you know the basics of Python inside out. This means being able to write code without referring to external resources such as books or online tutorials. Employers will want to see that you have a good foundation in the language and can work independently. A good way to test your knowledge is by trying to solve problems without looking up the solutions online. Here are few questions you would want to get familiar with:

  • What are some of the key features of Python?
  • What is the difference between Python 2 and Python 3?
  • What are some common Python programming mistakes?
  • What are some of the most popular Python IDEs you have worked with?

There are many important topics to cover when learning python programming. Questions can be asked related to these topics. Some of the key topics include

  • Data types and structures: Data types and structures are important to understand in order to be able to store and manipulate data effectively.
  • Object-oriented programming: Object-oriented programming is a powerful programming paradigm that can help you write cleaner, more reusable code. Everything in Python is an object, and each object has its own attributes and methods. As a result, understanding how objects work is essential for working with Python.
  • Exceptions and errors: Exceptions and errors are important to learn about in order to be able to debug your programs effectively.
  • Modules and libraries: Modules and libraries are important tools that can help you extend the functionality of your programs.

Be Familiar with the Different Libraries

Python has a wide range of libraries that can be used for different purposes. When preparing for an interview, make sure you are familiar with the most popular libraries as well as those that are relevant to the position you’re applying for. For example, if you’re applying for a data science position, brush up on your Pandas and NumPy skills. Interview questions on python libraries is an important topic for interviewees. This is because it helps to assess your knowledge in using the different python libraries. The interviewer can ask questions about the most popular python libraries, the functions of these libraries, and how to use them. You should be able to explain the functions of the different python libraries and show that they understand how to use them. The candidate should also be able to give examples of how they have used these libraries in their work.

Here are few questions you would want to get familiar with:

  • What are some of the most popular Python third party libraries you have worked with?
  • What is the purpose of the os library? What is the difference between the ‘os’ and ‘os.path’ modules?
  • What functions are contained in the ‘math’ module?
  • How would you go about accessing the ‘re’ module?
  • What is contained in the ‘collections’ module?
  • What are some features of the pandas library?
  • How would you use the matplotlib library to plot a line graph?

Understand Object-Oriented Programming Concepts

Employers will often ask questions about object-oriented programming (OOP) concepts such as inheritance, polymorphism, and encapsulation. Make sure you understand these concepts and can explain them clearly. Additionally, try to write some code that demonstrates your understanding of OOP principles. Here are few questions you would want to get good at:

  • What are classes and objects in Python? What are differences between them?
  • How is an object instantiated in Python?
  • How does inheritance work in Python?
  • What is multiple inheritance?
  • How does multiple inheritance work in Python?
  • What is the Python polymorphism concept? Provide a couple of examples.
  • What is the difference between Python duck typing and static typing?

Practice Data Structures and Algorithms

Questions about data structures and algorithms are common in Python interviews. Therefore, it’s important that you brush up on your skills in this area. Try solving some practice problems and then check your solutions against those given in popular books or online tutorials.

Be Prepared to Answer Questions about Your Projects

If you have any relevant projects in your portfolio, be prepared to talk about them in detail during the interview process. Employers will want to know what role you played in the project, what challenges you faced, and how you overcame them. Additionally, they may ask you to walk them through your code so be familiar with it before the interview.


While competition for Python jobs is fierce, there are things you can do to increase your chances of landing an interview. Firstly, make sure you know the basics of the language inside out. Secondly, familiarize yourself with the different libraries available in Python. Thirdly, understand object-oriented programming concepts well enough to explain them clearly and write code that demonstrates your understanding of these concepts fourthly , practice data structures and algorithms so that you can confidently answer questions about them during an interview fifthly , be prepared to talk about any relevant projects in your portfolio . By following these tips , you’ll be well on your way to impressing potential employers and landing that dream job .

Ajitesh Kumar
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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. For latest updates and blogs, follow us on Twitter. I would love to connect with you on Linkedin. Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking
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