python https://docs.python.org/3/tutorial/ standard library https://docs.python.org/3/library/index.html#library-index language reference https://docs.python.org/3/reference/index.html#reference-index extending / C & C++ / CPython https://docs.python.org/3/extending/index.html#extending-index Python / C API reference https://docs.python.org/3/c-api/index.html#c-api-index