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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.
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.
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