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Flexible Rot13 Function

/ Published in: Python
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This function takes 2 arguments, first is the string to be encoded (or decoded) the second is optional and can be used to change the rotation amount to something other than 13.

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  1. def rot(s, n=13):
  2.     r = ""
  3.     for c in s:
  4.         cc = c
  5.         if cc.isalpha():
  6.             cc = cc.lower()
  7.             o = ord(cc)
  8.             ro = (o+n) % 122
  9.             if ro == 0: ro = 122
  10.             if ro < 97: ro += 96
  11.             cc = chr(ro)
  12.         r = ''.join((r,cc))
  13.     return r

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