Shifting decipher (probability based)

A little experiment using probability to find out the shifting applied to encrypt a message.

dicctionary = ['the', "and","by","to", "in", "out"]
message = "Esp qtcde nzyqpcpynp zy esp ezatn zq Lcetqtntlw\
Tyepwwtrpynp hld spwo le Olcexzfes Nzwwprp ty estd jplc."

separation_characters =[' ','.']

score = []

m = [x.lower() for x in message]
m = "".join(m)
for i in range(27):
  sh = []
  for x in m:
      if x in separation_characters:
          sh.append(x)
      else:
          sh.append(chr(((ord(x)+i-97)%26 + 97)))
  sh = "".join(sh)
  words = sh.split(" ")
  print words
  found = 0
  for w in words:
      if w in dicctionary:
          found = found + 1
  print found/len(words)
  score.append(found/float(len(words)))
print score
maxval = 0
maxindex = 0
for i in range(len(score)):
  if score[i] > maxval:
      maxval = score[i]
      maxindex = i
print "SHIFT%d"%(maxindex)
sh = []
for x in m:
  if x in separation_characters:
      sh.append(x)
  else:
      sh.append(chr(((ord(x)+maxindex-97)%26 + 97)))  
print "".join(sh)