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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)
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Function composition is the way of combining two or more functions in such a way that the output of one function becomes the input of the second function and so on.
In Maths, the composition of a function is an operation where two functions say f and g generate a new function say h in such a way that h(x) = g(f(x)). It means here function g is applied to the function of x. So, basically, a function is applied to the result of another function.
Basic Syntax for Defining a Function in Python In Python, you define a function with the def keyword, then write the function identifier (name) followed by parentheses and a colon. The next thing you have to do is make sure you indent with a tab or 4 spaces, and then specify what you want the function to do for you.
Moreover, we will study the different types of functions in Python: Python built-in functions, Python recursion function, Python lambda function, and Python user-defined functions with their syntax and examples.
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.
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