python3 -m venv .venv
source .venv/bin/activate
python3 -m pip install wheel
python3 -m pip install -r requirements.txt

This is about the python language.

Some of the modules use tests to explain the semantics of langugage features.

Other modules solve language challenges. Those challenges are a common way to compare the expressivness and readability of different programming languages.

nosetests --with-doctest gotchas

Here are examples on how to use certain Python packages.

implementations of various design patterns in Python.