Can anyone explain what is the output of this code? Why it shows 'None'?

Question

https://code.sololearn.com/c40OpBHJstWN/?ref=app

Answer 1

@Alejandro has already explained, so this is how you should call the functions:
max(7)
max(8)

Answer 2

because you are trying to assign a function as value, and your function doesn't have a return statement

Answer 3

thanx @Alejandro @shamima , now i understood how to use return and print statements