from whrandom import randrange
import sys
from string import find,lower,strip

dict = open("/usr/dict/words","r")
words = dict.readlines()

# words is a list of words we will pick from

def pickword(words):
  while 1:
    idx = randrange(0,len(words))	# pick one of the words at random
    word = strip(words[idx])		# the word we picked
    if word == lower(word):
      return word

def template(word,ltrs):
  """Show the letters we have correctly guessed on correct positions.
     Show other letters as '_'
  """
  t = ''
  for c in word:
    if find(ltrs,c) < 0: c = '_'
    t = t + c
  return t  

def hangman(maxguesses):
  "Play one game of hangman."
  word = pickword(words)
  print 'I am thinking of a word with',len(word),'letters.'

  ltrs = ''
  wrong = ''

  while len(wrong) < maxguesses:
    t = template(word,ltrs)
    if t == word:
      print "You have guessed the word!  The word is",word
      return
    guess = raw_input(t + " : " + wrong + " ")
    if len(guess) > 1:
      guess = guess[0]
    if find(ltrs,guess) >= 0 or find(wrong,guess) >= 0:
      print 'You have already guessed that!'
    elif find(word,guess) >= 0: 
      print guess,' is correct!'
      ltrs = ltrs + guess
    else:
      print guess,'is not in the word.'
      wrong = wrong + guess

  print "Sorry, you took more than",maxguesses,"guesses."
  print "The word was",word

while 1:
  hangman(15)
  ans = raw_input("Do you want to play again? ")
  if len(ans) > 0 and lower(ans[0]) != 'y': break