Extending and Embedding Python

Extending and Embedding Python describes how to write modules in C or C++ to extend the Python interpreter with new modules. Those modules can not only define new functions but also new object types and their methods. The document also describes how to embed the Python interpreter in another application, for use as an extension language. Finally, it shows how to compile and link extension modules so that they can be loaded dynamically (at run time) into the interpreter, if the underlying operating system supports this feature. This document assumes basic knowledge about Python. 

For a detailed description of the whole Python/C API, see The Python/C API, ISBN 978-1-68092-163-2.

This book is available for free as a PDF at python.org.