I have been spent 3 days on "SECOND LESSON- 2ND LESSON" and still i dont know about its functioning..plz note : only 2nd slide

Question

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2437/

Answer 1

A lot of people have trouble with this concept.

# First function adds x+y.
def add(x, y):
    return x + y
print(add(2,3)) #5

# This function sets a placeholder for another function to be emplaced within.

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

# The previous bit of code could be saying:
return add(add(a,b), add(a,b))

Which will make
return add(15, 15)

Which will return 30

a = 5
b = 10

print(do_twice(add, a, b)) #30

Answer 2

Hi #challenger mg, I believe you have asked this question before, please refrain from making duplicate Questions!

Have you seen these?
https://www.sololearn.com/discuss/1316935/?ref=app
https://www.sololearn.com/discuss/2349030/?ref=app