Reverse a string without using reversed() or [::-1]?

Question

I came across a strange Codecademy exercise that required a function that would take a string as input and return it in reverse order. The only problem was you could not use

Answer 1

You can do simply like this

def rev(str):
   rev = ""
   for i in range(0,len(str)):
   rev = rev + str[(len(str)-1)-i]
   return rev