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IPython Interactive Computing and Visualization Cookbook - Second Edition by Cyrille Rossant

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Wrapping a C library in Python with ctypes

Wrapping a C library in Python allows us to leverage existing C code or to implement a critical part of the code in a fast language such as C.

It is relatively easy to use externally-compiled libraries with Python. The first possibility is to call a command-line executable with the os.system() command, but this method does not extend to compiled libraries.

A more powerful method consists of using a native Python module called ctypes. This module allows us to call functions defined in a compiled library (written in C) from Python. The ctypes module takes care of data type conversions between C and Python. In addition, the numpy.ctypeslib module provides facilities to use NumPy arrays wherever data buffers ...

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