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All function, type and macro definitions needed to use the Python/C API are included in your code by the following line:
#include "Python.h"
This implies inclusion of the following standard headers: <stdio.h>, <string.h>, <errno.h>, and <stdlib.h> (if available).
All user visible names defined by Python.h (except those defined by the included standard headers) have one of the prefixes "Py" or "_Py". Names beginning with "_Py" are for internal use only. Structure member names do not have a reserved prefix.
Important: user code should never define names that begin with "Py" or "_Py". This confuses the reader, and jeopardizes the portability of the user code to future Python versions, which may define additional names beginning with one of these prefixes.