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Decode Bacon\'s cipher

/ Published in: Python
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  1. import re
  2.  
  3. def bacon2text(bacon):
  4.     """ This function converts a string in bacon (a lot of 'a's and 'b's) to
  5.         plain text. The plaintext is returned. If a character can't be 
  6.         translated, a space will be inserted. """
  7.  
  8.     bacondict = {}
  9.     plaintext = ""
  10.  
  11.     bacon = bacon.lower()
  12.     bacon = re.sub("[\W\d]", "", bacon.strip())
  13.     for i in xrange(0,26):
  14.         tmp = bin(i)[2:].zfill(5)
  15.         tmp = tmp.replace('0', 'a')
  16.         tmp = tmp.replace('1', 'b')
  17.         bacondict[tmp] = chr(65+i)
  18.  
  19.     for i in xrange(0, len(bacon)/5):
  20.         plaintext = plaintext + bacondict.get(bacon[i*5:i*5+5], ' ')
  21.     return plaintext
  22.  
  23. crypto = """BAABBAABBBABAAABAABA ABAAABAABA AAAAA AAAABAAAAAAAABAABBBAABBAB AAABAABAAAABBBBAABBBAABAABAAAB ABBAAAABAABAABABAABAAAAAAAABBAAABAA"""
  24. print bacon2text(crypto)

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