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Python Developer interview questions & mock practice

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What interview questions are asked for a Python Developer?

A Python Developer interview in 2026 runs across 4 rounds — core python round, oop & internals, framework round, coding round. Below are the most-asked Python Developer interview questions and a focused prep plan. Rehearse every answer out loud with the free timed practice below before the real one.

  • Python
  • OOP
  • Data Structures
  • Django
  • Flask
  • REST APIs
  • SQL

Free interview practice · Python Developer

Practise your Python Developer interview now — free

Step through the 12 most-asked Python Developer questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.

Interview rounds

The Python Developer interview process

Core Python, data structures, OOP and frameworks like Django or Flask — the Python interview for backend, automation and data teams.

1. Core Python round

Data types, comprehensions, generators and the Python data model.

2. OOP & internals

Classes, decorators, the GIL and memory management.

3. Framework round

Django/Flask, ORM, REST APIs.

4. Coding round

DSA and problem solving in Python.

Most-asked questions

Most-asked Python Developer interview questions

12 of the questions Python Developer candidates are asked most often in India. Practise answering each one out loud in the timed practice above.

  1. 1. What is the difference between a list, a tuple and a set in Python?
  2. 2. What are Python decorators and how do they work?
  3. 3. Explain the difference between deep copy and shallow copy.
  4. 4. What is the Global Interpreter Lock (GIL) and how does it affect threading?
  5. 5. What is the difference between *args and **kwargs?
  6. 6. Explain list comprehensions and generators — when do you use a generator?
  7. 7. What is the difference between == and is in Python?
  8. 8. How is memory managed in Python (reference counting and garbage collection)?
  9. 9. What are Python's mutable vs immutable types?
  10. 10. Explain how exception handling works with try/except/finally.
  11. 11. What is the difference between @staticmethod and @classmethod?
  12. 12. How would you handle a large file that doesn't fit in memory?
How to prepare

How to prepare for your Python Developer interview

Know Python data structures and their trade-offs: list vs tuple vs set vs dict, and their time complexities.

Be ready to explain decorators, generators, comprehensions and context managers with real examples.

Understand the GIL, mutability, and reference semantics — these trip up candidates who only know syntax.

If the role uses Django/Flask, know the ORM, request lifecycle, middleware and how to build a REST API.

Practice DSA in Python and be comfortable with idiomatic, Pythonic solutions (not Java-in-Python).

Practise other roles

Interview prep guides

Python Developer interview — FAQs

What questions are asked in a Python Developer interview?

Common Python Developer interview questions include: What is the difference between a list, a tuple and a set in Python? What are Python decorators and how do they work? Explain the difference between deep copy and shallow copy. What is the Global Interpreter Lock (GIL) and how does it affect threading? Interviews usually run across 4 rounds — Core Python round, OOP & internals, Framework round, Coding round. Practise them with the free timed practice on this page.

How many rounds are in a Python Developer interview?

A typical Python Developer interview has 4 rounds: Core Python round (Data types, comprehensions, generators and the Python data model.); OOP & internals (Classes, decorators, the GIL and memory management.); Framework round (Django/Flask, ORM, REST APIs.); Coding round (DSA and problem solving in Python.).

How do I prepare for a Python Developer interview?

To prepare for a Python Developer interview: Know Python data structures and their trade-offs: list vs tuple vs set vs dict, and their time complexities. Be ready to explain decorators, generators, comprehensions and context managers with real examples. Understand the GIL, mutability, and reference semantics — these trip up candidates who only know syntax. Then rehearse every question out loud with the timed practice on this page before the real thing.

What skills do I need for a Python Developer role?

Core Python Developer skills tested in interviews include Python, OOP, Data Structures, Django, Flask, REST APIs, SQL. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Python Developer job.

Is the Python Developer mock interview practice free?

Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.

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