Function composition in Python

The pointfree module is about using function composition notation in conjunction with automatic partial application. Both of these features are achieved by wrapping functions in the pointfree class (which can also be applied as a decorator).

Several “pre-wrapped” helper functions are provided by the module. For instance, if you wanted to define a function that returns the sum of squares of the lengths of the strings in a list, you could do so by combining the helpers pfmap() and pfreduce():

>>> from pointfree import * >>> from operator import add  >>> fn = pfmap(len) >> pfmap(lambda n: n**2) >> pfreduce(add, initial=0) >>> fn(["foo", "barr", "bazzz"]) 50

Interesting module. I’m looking for something similar in order to process huge datasets in streams, and maybe this could be used.

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