Show HN: Python library for functional programming

Re:Show HN: Python library for functional programming by sevensor on Thursday December 14, 2017 @12:12PM (#15924091)

Here's how you could hack up a pipe operator in Python:

    class Funk:
         def __init__(self, f):
             self._f = f
         def __or__(self, other):
             return Funk(lambda *_, **__: other(self(*_, **__)))    
         def __call__(self, *args, **kwargs):
             return self._f(*args, **kwargs)

This lets you do fun stuff like:

    pipeline = Funk(h) | Funk(g) | Funk(f)
    pipeline(x)
    pipeline(y)

And that makes me happy that I participated in this discussion.

I'm kind of surprised nobody's done this before. Unless they have. Any pointers to more fully fleshed out implementations of this idea?

[ Parent | on HN ]

Re:Show HN: Python library for functional programming by entilzha on Monday December 18, 2017 @11:23PM (#15957741)

You could actually simplify even more with the trick used in a comment farther down (https://github.com/0101/pipetools). That way you would implement __or__ on for example `pipe` and not have to wrap each function.

As it turns out, implementing that different syntax in pyfunctional wouldn't be too hard or API breaking I think. Mainly it would require 1) wrapping/exporting functions to a module you could bring into scope (eg `from functional import functions as F` or `from functional.functions import *`), 2) Writing wrapper code to provide something functionally similar to `pipe`.

On libraries, I swear I saw something a while back, but my googlefu just now didn't help me find it.

[ Parent | on HN ]