source: misc/puzzle-suggestions.py@ 401

#!/usr/bin/env python
#
# Draw Something or any other puzzle hint script
#
# Please note that dictonaries needs to be fetched from various places.
#
# Licence: BSDLike
#
import glob
import re
import sys

def find_words(word_length, letters):
  # No special characters allowed
  reg=re.compile('^[a-zA-Z]{%s}\n$' % word_length)
  
  # Build an list of available words
  word_dict = {}
  for fname in glob.glob('/home/rvdzwet/Downloads/scowl-7.1/final/english-*'):
    with open(fname,'r') as f:
      for word in f:
        if reg.match(word):
          word_dict[word.strip().lower()] = True
  
  word = range(word_length)
  def choice(i, letters):
    """ Recursively process the letters """
    for j in range(0,len(letters)):
      # Make sure not to process the same letter twice
      if letters[j] in letters[0:j]:
        continue
      word[i] = letters[j]
      if i == word_length - 1:
        test_word = ''.join(word)
        if word_dict.has_key(test_word):
          print test_word
      else:
        choice(i+1, letters[:j] + letters[j+1:])
  
  choice(0, letters)


if __name__ == '__main__':
  try:
    word_length = int(sys.argv[1])
    letters = tuple(sys.argv[2])
    find_words(word_length, letters)
  except IndexError:
    print "Usage: %s <length> <letters>" 
    sys.exit(128)