Python: How to get the Index of a string

How can I write a function that retu开发者_如何学Pythonrns the index of a single character in a string without using the index method a.k.a string.index('some random character')?

Another variant that works with multiple occurrences of char in string.

def idx(string, char):
  for key, x in enumerate(string):
    if x == char:
      print key

it's a school task?

def ind(the_string, the_char):
   i = 0
   for a_char in the_string:
       if a_char == the_char: return i
       i += 1
   return -1

index() is the same thing as find() except for the error when the string isn't found.