Learn Functional Programming in Python/

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Partial Application With functools.partial

Partial Application With functools.partial

Learn how to create partial applications of functions using the partial function in the functools library.

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functools.partial function

The functools module provides a function, partial, that can be used to create a partial application of a function. Here is how you could use it to create a max0 function:

Python 3.8
from functools import partial
max0 = partial(max, 0)
print(max0(3)) # 3 
print(max0(-1)) # 0

Here is how you could use it with map, similar to the previous example:

Python 3.8
from functools import partial
m = map(partial(max, 3), [1, 2, 3, 4, 5])
print(list(m))

The advantage here is that you don’t have to define a separate closure, maxn. The code is more ...