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 compose(list):     if len(list) == 1:         return lambda x:list[0](x)     list.reverse()     final=lambda x:x     for f in list:         final=lambda x:f(final(x))     return final 

This method doesn't seems to be working, help will be appreciated.

(I'm reversing the list because this is the order of composition I want the functions to be)

Answer 1

The easiest approach would be first to write a composition of 2 functions:

def compose2(f, g):     return lambda *a, **kw: f(g(*a, **kw)) 

And then use reduce to compose more functions:

import functools  def compose(*fs):     return functools.reduce(compose2, fs) 

Or you can use some library, which already contains compose function.