📚 Playground and cheatsheet for learning Python

A playground and cheatsheet for learning Python: a collection of Python scripts split by topic, each with code examples, explanations and links to further reading.

It's a playground because you can change the code, check that it still works with the tests and assertions, and lint it against the Python style guide. It's a cheatsheet because you can come back to recall the syntax of a statement or a construct. The topics run from operators and data types through control flow, functions, classes and modules to exceptions, files and the standard library.