return keyword

Question

Why there is a difference between the two ''return''?
def hello1():
for i in range(5):
print("Hello world!")
print (i)
return
hello1 ()

def hello2():
for i in range(5):
print("Hello world!")
print (i)
return
hello2 ()

Answer 1

One is in the loop and the other in the function body which obviously gives different results as the return in the loop exits the loop and function prematurely.

Answer 2

because python uses indentation to structure code.

Answer 3

Why there is just one ''0'' for the top code?