[Tutor] Doctest error!

[John]

Hi all,
When i run a doctest on this piece of code (shown at bottom) i get this error message [from the doctest]:



Trying:
     rot13('5 The Parade')
Expecting:
     '5 Gur Cnenqr'
**********************************************************************
File "F:\Uni\Rot13_1.py", line 12, in Rot13_1.rot13
Failed example:
     rot13('5 The Parade')
Expected:
     '5 Gur Cnenqr'
Got:
     'B-aur-]n\x7fnqr'
Trying:
     rot13('5 Gur Cnenqr')
Expecting:
     '5 The Parade'
**********************************************************************
File "F:\Uni\Rot13_1.py", line 14, in Rot13_1.rot13
Failed example:
     rot13('5 Gur Cnenqr')
Expected:
     '5 The Parade'
Got:
     'B-T\x82\x7f-P{r{~\x7f'



An one have any idea why? (I'm guessing its to do with the numbers)


code:

def rot13(s):

     """
     >>>   type(rot13("bob"))
     <type 'str'>
     >>>   len(rot13("foobar"))
     6
     >>>   rot13("abc")
     'nop'
     >>>   rot13("XYZ")
     'KLM'
     >>>   rot13('5 The Parade')
     '5 Gur Cnenqr'
     >>>   rot13('5 Gur Cnenqr')
     '5 The Parade'
     """
     result = ''             # initialize output to empty
     for char in s:      # iterate over string
         if int:
             char_low = s.lower()
             if char_low<= 'm':
                     dist = 13
             else:
                 dist = -13
             char = chr(ord(char) + dist)
         result+=char
     return result