Composition of Functions creative solution for Group Equal consecutive by flpo - python coding challenges

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Composition of Functions solution in Creative category for Group Equal consecutive by flpo

from itertools import groupby
from operator import itemgetter
from functools import partial, reduce

compose = lambda *funcs: lambda x: reduce(lambda x, f: f(x), reversed(funcs), x)

group_equal = compose(list, partial(map, compose(list, itemgetter(1))), groupby)

Oct. 29, 2018

Comments:

BrianMcleod on Dec. 7, 2018, 6:29 p.m.
Ok, intriguing. Can you explain the definition of compose? I'm lost in the 3 lambdas (especially the lambda x: twice).

flpo on Sept. 13, 2019, 3:16 p.m.
Hi, sorry for the late answer. `compose` is just canonical composition of functions, you can unroll the definition as: <pre class='brush: python'>def compose(*funcs): def wrapper(x): for f in reversed(funcs): x = f(x) return x return wrapper </pre> Basically, given functions `h, g, f`, `compose(h, g, f)(x) == h(g(f(x)))`

hkgok1 on June 17, 2022, 5:57 a.m.
Very Creative ! Interesting use of groupby and wrapper can be written in this way also

flowerinapot on July 14, 2023, 2:46 p.m.
Very difficult to understand solution, 5+

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