The Python C API

The C API is divided into these sections:

1. Include/: Limited API
2. Include/cpython/: CPython implementation details
3. Include/cpython/, names with the PyUnstable_ prefix: API that can change between minor releases
4. Include/internal/, and any name with _ prefix: The internal API

Information on changing the C API is available in the developer guide_

.. _in the developer guide: https://devguide.python.org/c-api/