Python Threading Interview Questions

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Python Threading Interview Questions

Answers To 120+ Interview Questions On Python Threading

How well do you know Python threads?

The threading module provides thread-based concurrency in Python and few developers know about it, let alone, how to use it well.

The main reason is that it is widely thought that Python does not support threads because of the Global Interpreter Lock (GIL).

This is false.

In fact, threads remain the best approach to achieving concurrency for IO-bound tasks.

  • Do you know how to start a thread?
  • Do you know how to use mutex locks with Python threads?
  • Do you know how to identify a race condition?

Discover 120 interview questions on Python threading.

  • Study the questions and answers and improve your skills.
  • Test yourself to see what you really know, and what you don't.
  • Select questions to interview developers on a new role.

What topics are covered?

The questions are divided into major topics, they are:

  1. Threads vs Processes
  2. Global Interpreter Lock
  3. Blocking Calls
  4. Main Thread and Thread Utilities
  5. Starting Threads
  6. Thread-Local Storage
  7. Daemon Threads
  8. Thread Names
  9. Mutex Locks
  10. Atomic Operations
  11. Thread Failure Modes
  12. Condition Variables
  13. Semaphores
  14. Events
  15. Timer Threads
  16. Barriers
  17. Queues
  18. Best Practices
  19. Advanced

Prepare for an interview or test your Python threading skills today.

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About the Author

Jason Brownlee, Ph.D. helps Python developers bring modern concurrency methods to their projects with hands-on tutorials.

Jason loves Python Concurrency. It's all he does. It’s his main thing.

Jason has:

  • Read all the books on Python concurrency.
  • Used all of the Python concurrency APIs in the standard library.
  • Written 500+ tutorials and 12+ books on Python concurrency.

Learn more at

Jason is a software engineer and research scientist with a background in artificial intelligence and high-performance computing. He has authored more than 20 technical books on machine learning and has built, operated, and exited online businesses.

See his linkedin profile here:

Any Questions?

Hi, Jason here, do you have any questions?

Contact me directly at any time about this product or Python concurrency generally. I'm here to help as best I can.

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Python Threading Interview Questions

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I want this!