Python Threading Interview Questions

Super Fast Python
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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 because 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.

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

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

What topics are covered?

This book provides a large number of questions on what, how and when to use the Python threading API.

The questions are divided into major topics, they are:

  • Threads vs Processes
  • Global Interpreter Lock
  • Blocking Calls
  • Main Thread and Thread Utilities
  • Starting Threads
  • Thread-Local Storage
  • Daemon Threads
  • Thread Names
  • Mutex Locks
  • Atomic Operations
  • Thread Failure Modes
  • Condition Variables
  • Semaphores
  • Events
  • Timer Threads
  • Barriers
  • Queues
  • Best Practices
  • Advanced

Each topic has a preamble summarizing the types of questions to expect for the topic and why they are important.

Each question is listed in a heading format, so that you can read it and think about for self-study. This is followed by the answer.

Sometimes the answers will provide additional clarifying information and sample code.

Those questions that require a code example will provide a full code listing in the answer that may be used as a guide.

Who Is Book This For?

Let's make sure you're in the right place.

Specifically, this book is for:

  • Developers that want to learn the threading API with pointed questions.
  • Developers that want to test their knowledge of the threading API.
  • Engineering managers that want to evaluate candidates for a job that requires Python threading.

How to Read

If you are a Python developer looking to learn the threading module API, I recommend working through the book sequentially from start-to-finish. You can pick and choose topics if you need to brush up on specific areas.

If you are a Python developer looking to test your knowledge, I would recommend working through questions one at a time. All questions are listed in the table of contents, which you can use to test your knowledge. Record your answers, then compare your answers to the answers provided later in the book.

If you are an engineering manager, I recommend selecting a sample of questions from the book to ask in a technical interview. Perhaps select some general knowledge questions as well as some questions that require a code listing that could be prepared on paper, a google doc or whiteboard. The questions in the book may also be combined, remixed, or used to inspire your own questions.

What Version of Python is Used?

All code examples use Python 3.

Python 3.9+ to be exact.

Python 2.7 is not supported because it reached end of life in 2020.

What Format Is the Ebook?
(pdf and epub)

The ebook is provide in 2 formats:

  • PDF (.pdf): perfect for reading on the screen or tablet.
  • EPub (.epub): perfect for reading on a tablet with a Kindle or iBooks app.

How Many Pages Is The Book?

69 pages

The PDF has 69 US letter size pages.

Can I Print The Book?


Although, I think it's better working through it on the screen.

  • You can search, skip, and jump around really fast.
  • You can copy-and-paste code examples.
  • You can compare code output directly.

Is There Digital Rights Management (DRM)?


Do I Get Free Updates to the Code and Book?


Each time I release an updated version, I will send you an email with a link so that you can download the latest version for free.

Happiness Guarantee

I want you to be happy, and I stand behind my materials.

If you decide that Python concurrency is not for you, or whatever reason, I'll understand.

I offer a 100% money back guarantee, no questions asked.

Get in touch at:

Can I Buy The Book Elsewhere?


Any Questions?

Contact me directly, any time about this book or Python concurrency generally.

I'm here to help as best I can.

You can send an email directly to my inbox via:

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  • You'll get a .zip download containing both ebook formats (pdf and epub).

  • Size
    2.2 MB
  • Formats
    PDF and EPUB
  • Questions
  • Answers
    YES, every question
  • Pages
  • You'll get a .zip download containing both ebook formats (pdf and epub).
  • Size2.2 MB
  • FormatsPDF and EPUB
  • Questions120+
  • AnswersYES, every question
  • Pages69
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Python Threading Interview Questions

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