Introduction

Cython is a programming language that makes writing C extensions for Python as easy as Python itself. It lets us write Python code that calls back and forth from and to C/C++ code natively, and compiles to efficient C code usable as a Python extension module.

At Intersec , we use Cython in lib-common , our open-source C library. One of its key components is IOPy, the Python binding for our IOP serialization framework (similar to Protocol Buffers). IOPy dynamically creates Python classes from IOP type definitions at DSO load time, and each class needs to hold a pointer to its C type descriptor for fast serialization.