1. Extending Python with C or C++
It is quite easy to add new built-in modules to Python, if you know how to program in C.
Such extension modules can do two things that can't be done directly in
Python: they can implement new built-in object types, and they can call C library functions
and system calls.
To support extensions, the Python API (Application Programmers Interface) defines a set of
functions, macros and variables that provide access to most aspects of the Python run-time
system. The Python API is incorporated in a C source file by including the header "Python.h".
The compilation of an extension module depends on its intended use as well as on your
system setup; details are given in later chapters.
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