cython3 - 0.29.21-3+b1 main

Cython is a language that makes writing C extensions for the Python language as
easy as Python itself. Cython is based on the well-known 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.