How to work it

Question

def apply_twice(func, arg):
return func(func(arg))

def add_five(x):
return x + 5

print(apply_twice(add_five, 10))

How to work it please help me.....

Answer 1

It works very well...!

when you called the apply_twice function under a print function, it took it's arguments add_five and 10 to the function body.
now, let's go to the apply_twice function. 'func' and 'arg' are now changed to 'add_five' and '10' respectively. The return statement now turned like this,

return add_five(add_five(10))

add_five(10) returns 15 from the second function.

then we have

return add_five(15)

and finally it returns 20.

Answer 2

do you see, what is func and what is arg?