Python
The Python Tutorial - Python 3.8.3 documentation
The Python Standard Library - Python 3.8.3 documentation
The Python Language Reference - Python 3.8.3 documentation
Disassembly and decompilation
dis - Disassembler for Python bytecode - Python 3.8.4rc1 documentation
PyPy
greenlet: Lightweight concurrent programming - greenlet 0.4.0 documentation