It offers many useful features :
Create an extension using Cython — not an easy task. To do this, you need to create a collection of wrapper functions. Assuming the working code shown was compiled into a C library called libwork . The code below will create a file named
Code # 1:
In Cython, the above code will work as a C header file. The original cdef extern declaration from
work.h declares the required C header file. The following declarations are from header. The name of this file is —
cwork.pxd . The next target — create a file
work.pyx which will define wrappers that connect the Python interpreter to the underlying C code declared in
cwork.pxd . p >
Code # 2:
Code # 3: p>
Finally, to build an extension module, create a file
Code # 4:
Code # 5: Building the resulting module for experiments.
% python3 setup.py build_ext --inplace
cythoning work.pyx to work.c
gcc -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes
/ usr / local / include / python3
. 3m -c work.c
gcc -bundle -undefined dynamic_lookup build
. macosx-10.6-x86_64-3.3 code >
- L. -lwork -o work.so
We now have a plugin
work.so code > Let`s see how it works.
Code # 6:
GCD: 4 Division: (4, 2) Average: 2.0 pt1: & lt; capsule object "Point" at 0x1005d1e70 & gt; pt2: & lt; capsule object "Point" at 0x1005d1ea0 & gt; Distance between the two points: 2.8284271247461903
At a high level, Cython usage is modeled after C. The .pxd files simply contain C definitions (similar to
.h ), and the
.pyx files contain the implementation (similar to the
.c file). The cimport statement is used by Cython to import definitions from the
.pxd file. This is different from using a regular Python import statement that would load a regular Python module.
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