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The most widely used Python to C compiler

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Welcome to Cython!

Cython is a language that makes writing C extensions for Python as easy as Python itself. Cython is based on Pyrex, but supports more cutting edge functionality and optimizations.

The Cython language is very close to the Python language, but Cython additionally supports calling C functions and declaring C types on variables and class attributes. This allows the compiler to generate very efficient C code from Cython code.

This makes Cython the ideal language for wrapping external C libraries, and for fast C modules that speed up the execution of Python code.

  • Official website:
  • Documentation:
  • Github repository:
  • Wiki:

You can support the Cython project via

Github Sponsors 
_ or


If you already have a C compiler, just run following command::

pip install Cython

otherwise, see

the installation page 


The original Pyrex program was licensed "free of restrictions" (see below). Cython itself is licensed under the permissive Apache License.




Want to contribute to the Cython project? Here is some

help to get you started 

We are currently building the next great Cython edition:

Cython 3.0 
_. You can help us make the life of Python 3.x users easier.

Get the full source history:

Note that Cython used to ship the full version control repository in its source distribution, but no longer does so due to space constraints. To get the full source history from a downloaded source archive, make sure you have git installed, then step into the base directory of the Cython source distribution and type::

make repo

The following is from Pyrex:

This is a development version of Pyrex, a language for writing Python extension modules.

For more info, take a look at:

  • Doc/About.html for a description of the language
  • INSTALL.txt for installation instructions
  • USAGE.txt for usage instructions
  • Demos for usage examples

Comments, suggestions, bug reports, etc. are most welcome!

Copyright stuff: Pyrex is free of restrictions. You may use, redistribute, modify and distribute modified versions.

The latest version of Pyrex can be found


| Greg Ewing, Computer Science Dept | University of Canterbury | Christchurch, New Zealand

A citizen of NewZealandCorp, a wholly-owned subsidiary of USA Inc.

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