How to find output in program. I'm not understand twice function in this code

Question

def add(x, y):
return x + y

def do_twice(func, x, y):
return func(func(x, y), func(x, y))

a = 5
b = 10

print(do_twice(add, a, b))

Answer 1

I have put some information and explanation for you together with the extended code from you. Hope this helps. Don't worry if you get a little bit confused of this code, but you will very rarely find something like this in practice. It's more a demonstration what's possible. In general this kind of functional programming is used very offen, but in a more clear and readable way.
https://code.sololearn.com/cXJst991RZ7e/?ref=app
https://code.sololearn.com/cXJst991RZ7e/?ref=app