The Python C API

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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/