Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Learn Python Programming 3rd Edition

Welcome to Learn Python Programming, 3rd Edition.

Here you can find the complete source code for this book. Every line of code you will find in the book is in this repository, plus all the code that we couldn't fit in the book.

Working on a chapter

We suggest you create a dedicated virtual environment for each chapter you wish to work on. Chapters that require third-party libraries will have a folder inside, called requirements.

First you will need to create a virtual environment. If you don't know what a virtual environment is, please read Chapter 1.

Let's now pretend you want to work on Chapter 12. First, change into the folder for Chapter 12 (it's called ch12):

$ cd ch12

Then, create a virtual environment. In this example the virtual environment will live inside the chapter's folder, but you can choose any other folder that might suit you better.

$ python3.9 -m venv .venv

We have given the virtual environment folder the name .venv. Feel free to choose any other name that you might want.

Note: the above procedure might fail in some of the chapter folders, due to the presence of files that aren't meant to be run. If that is the case, you should choose another folder where to place your virtual environment. You can create one within the chapter folder itself, or place the virtual environment outside of the chapter folder altogether.

Next step is to activate the virtual environment:

$ source  .venv/bin/activate

If you're on Windows, to activate your environment, you will need to run:

$ .venv\Scripts\activate

Next, if the requirements folder is present, change into it, and run the following command for each of the .txt files you will find in it. Normally there is only a requirements.txt file.

$ cd requirements
$ pip install -U -r requirements.txt
$ cd ..  # this brings you back to the root of the chapter

Once you have installed all requirements, you are ready to run the chapter's code. If a chapter needs extra work to be set up, you will find all the instructions you need in the chapter's text.

Note: Always remember to activate the virtual environment before you install third-party libraries.

Download a free PDF

If you have already purchased a print or Kindle version of this book, you can get a DRM-free PDF version at no cost.
Simply click on the link to claim your free PDF.


Learn Python Programming 3E. Published by Packt







No releases published


No packages published