If you need to write C extension for Python then this is the place for you.

The full documentation is on Read the Docs.

Code examples and documentation source are on GitHub. The example and test code is available on PyPi.

• Introduction
• A Simple Example
• PyObjects and Reference Counting
• Containers and Reference Counts
• Struct Sequence Objects (a namedtuple in C)
• Exception Raising
• A Pythonic Coding Pattern for C Functions
• Parsing Python Arguments
• Creating New Types
• Setting and Getting Module Globals
• Logging and Frames
• File Paths and Files
• Subclassing and Using super()
• Capsules
• Iterators and Generators
• Context Managers
• Pickling C Extension Types
• Watchers [Python 3.12+]
• Setting Compiler Flags
• Debugging
• Memory Leaks
• Thread Safety
• Source Code Layout
• Using C++ With CPython Code
• Miscellaneous
• Installation
• Further Reading
• TODO
• History
• Index

• Source is on GitHub.
• Documentation on Read the Docs.
• Project is on PyPi.

I have presented some of this, well mostly the chapter "PyObjects and Reference Counting", at Python conferences so if you prefer videos they are here:

• PyCon UK 2015
• PyCon US 2016