Question

Lets say we have two defined function objects

add1 = lambda x: x+1

and

square = lambda x: x*x  

now I want to have a function that calls and adds the result of these two functions.
What I thought would work is:

def addFuncs(f,g):
    f+g

addFuncs(add1,square)(10)

Which I thought would give me an answer of 111 (10*10 + 10+1)
But that just gave me an error TypeError: unsupported operand type(s) for +: 'function' and 'function'
So I tried:

def addFunctions(f, g):
    def getf():
        return f
    def getg():
        return g
    return getf() + getg()

But still to no avail…
However, if I do

def addFunctions(f, g):
    return f

it pops out with 100, so it seems to evaluate the function on return, But I can’t figure out how to get it to evaluate the functions first and then operate on them.
Any help would be greatly appreciated!

EDIT
Got it!

def addFunctions(f, g):
    return lambda x: f(x) + g(x)

Answer 1

def addFuncs(f,g):
    return lambda x: f(x) + g(x)

addFuncs(add1,square)(10)

Python doesn’t support adding functions together which both of your attempts tried to do. Instead, you need to create a new function, such as with lambda which calls the original functions.