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10. Use Cython to speed up your code

Sumit Rawal answered on May 13, 2023 Popularity 1/10 Helpfulness 1/10

answer 10. Use Cython to speed up your code

10. Use Cython to speed up your code

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Cython is a superset of Python that allows us to write C extensions for Python. This can significantly speed up our code, especially for computationally intensive tasks.

Here is an example of using Cython to speed up a Python function that calculates the sum of squares:

# Python Code
def calculate_sum(n):
    total = 0
    for i in range(n):
        total += i
    return total

# Cython Code
%%cython
def calculate_sum_cython(int n):
    cdef int total = 0
    for i in range(n):
        total += i
    return total
Now, we’ll use Cython to speed up this function. We’ll start by creating a .pyx file containing the Cython version of the function:

# file: sum_squares_cython.pyx

def sum_squares_cython(int n):
    cdef int total = 0
    cdef int i
    for i in range(n):
        total += i**2
    return total
We’ve added type declarations (cdef int) for the variables, which allows Cython to generate faster C code.

To compile the Cython code into a Python extension module, we need to create a setup.py file:

from distutils.core import setup
from Cython.Build import cythonize

setup(ext_modules=cythonize("sum_squares_cython.pyx"))
Now we can compile the extension module by running python setup.py build_ext --inplace. This will create a file called sum_squares_cython.so (or sum_squares_cython.pyd on Windows).

Finally, we can import and use the sum_squares_cython function in Python:

from sum_squares_cython import sum_squares_cython

result = sum_squares_cython(1000000)
print(result)

Popularity 1/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: cython python

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Contributed on May 13 2023

Sumit Rawal

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10. Use Cython to speed up your code

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