Effective Data Manipulation with pandas/

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Optimizing Manipulations Using Cython

Optimizing Manipulations Using Cython

See the optimization of string manipulations using Cython.

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The previous example uses apply, and it’s clear by now that we don’t prefer that method because it’s slow. Let’s divert from strings for a minute and look at making the apply operation quicker using Cython.

Cython is a superset of Python that can compile to native code. To enable it in Jupyter, you’ll need to run the following cell magic:

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%load_ext Cython

Then you can define functions with Cython. We’re going to “cythonize” the between function as a first step:

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%%cython
import random
def between_cy(row):
	return random.randint(*row.values)

When we benchmark this, it’s no faster than our current code. If we add types to Cython code, we can get a speed increase. ...