Composing functions in python

Question

I have an array of functions and I\'m trying to produce one function which consists of the composition of the elements in my array. My approach is:

def compo         


        

Answer 1

Suppose you have the following functions:

def square(x): 
    return x**2

def inc(x): 
    return x+1

def half(x): 
    return x/2

Define a compose function as follows:

import functools

def compose(*functions):
    return functools.reduce(lambda f, g: lambda x: g(f(x)),
                            functions,
                            lambda x: x)

Usage:

composed = compose(square, inc, inc, half)
compose(10)
>>> 51.0

which executes the functions procedurally in the defined order:

1. square (= 100)
2. inc (= 101)
3. inc (= 102)
4. half (= 51)

Adapted from https://mathieularose.com/function-composition-in-python/.