Cython

Cython is an actively used programming language created in 2007. Cython is a superset of the Python programming language, designed to give C-like performance with code which is mostly written in Python. Cython is a compiled language that generates CPython extension modules. These extension modules can then be loaded and used by regular Python code using the import statement. Read more on Wikipedia...

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• Cython ranks in the top 10% of languages
• the Cython website
• the Cython wikipedia page
• Cython first appeared in 2007
• file extensions for Cython include pyx, pxd and pxi
• See also: python, c, linux, pyrex, sagemath, xml, scipy, pandas, scikit-learn
• Have a question about Cython not answered here? Email me and let me know how I can help.

Example code from Wikipedia:

In [1]: %load_ext Cython

In [2]: %%cython
   ...: def f(n):
   ...:     a = 0
   ...:     for i in range(n):
   ...:         a += i
   ...:     return a
   ...: 
   ...: cpdef g(int n):
   ...:     cdef int a = 0, i
   ...:     for i in range(n):
   ...:         a += i
   ...:     return a
   ...: 

In [3]: %timeit f(1000000)
42.7 ms ± 783 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

In [4]: %timeit g(1000000)
74 µs ± 16.6 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)

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Last updated February 18th, 2020

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