How to correctly define a function?

Question

In python I\'m trying to do the following to define a function:

count_letters(word) = count_vowels(word) + count_consonants(word)

But for

Answer 1

The result of function call count_letters(word) is not assignable. That's as easy as that.

I don't believe it can work in python though, you should have an error like that:

SyntaxError: can't assign to function call