title: Can someone help me with hangman?
body: <p>I'm using python 2.7.1 to make a hangman game. I am trying to let the user choose whether to replay before the game finishes. I am trying to use a variable <code>keep_playing</code>, but it doesn't work.
  Also, in <code>guesses=word_len * ['_']</code>, I want to have a space between the underscores because, if they stick together, I can't see how many letters are left. This is my hangman code:</p>
  
  <pre><code>from random import *
  import os
  
  
  keep_playing = True
  def print_game_rules(max_incorrect,word_len):
      print"you have only 7 chances to guess the right answer"
      return
  
  def get_letter():
      print
      letter = raw_input("Guess a letter in the mystery word:") 
      letter.strip()
      letter.lower()
      print
      os.system('cls')
      return letter
  def display_figure(hangman):
      graphics = [
      """
          +--------+
           |
           |
           |
           |
           |
           |
       ====================
      """,
      """
          +-------
          |      o
          |
          |
          |
          |
      ====================
      """,
      """
          +-------
          |      o
          |      +   
          |      |
          |
          |
      ======================
      """,
      """
          +-------
          |       o
          |    ---+
          |       |
          |    
          |  
          |   
      =====================
      """,
      """
          +-------
          |       o
          |    ---+---
          |       |
          |        
          |         
          |     
          |
      =====================
      """,
      """
          +-------
          |       o
          |    ---+---
          |       |
          |      / 
          |     /   
          |    /     
          |     
      =====================
      """,
      """
          +-------
          |       o
          |    ---+---
          |       |
          |      / \   
          |     /   \  
          |    /     \    
          |     
      =====================
      """]
  
      print graphics[hangman]
      return
  
  
  
  animals=["horse","donkey","dinosaur","monkey","cat","aligator","butterfly","buffallo","dragon"]
  word=choice(animals)
  word_len=len(word)
  guesses=word_len * ['_']
  max_incorrect=6
  alphabet="abcdefghijklmnopqrstuvxyz"
  letters_tried=""
  number_guesses=0
  letters_correct=0
  incorrect_guesses=0
  
  
  print_game_rules(max_incorrect,word_len)
  while (incorrect_guesses != max_incorrect) and (letters_correct != word_len):
      letter=get_letter()
      if len(letter)==1 and letter.isalpha():
          if letters_tried.find(letter) != -1:
              print "You already picked", letter
          else:
              letters_tried = letters_tried + letter
              first_index=word.find(letter)
              if  first_index == -1:
                  incorrect_guesses= incorrect_guesses +1
                  print "The",letter,"is not the mystery word."
              else:
                  print"The",letter,"is in the mystery word."
                  letters_correct=letters_correct+1
                  for i in range(word_len):
                      if letter == word[i]:
                          guesses[i] = letter
  
      else:
          print "Please guess a single letter in the alphabet."
      display_figure(incorrect_guesses)
  
      print ''.join(guesses)
      print "Letters tried so far: ", letters_tried
      if incorrect_guesses == max_incorrect:
          print "Sorry, too many incorrect guesses. You are hanged."
          print "The word was",word
          keep_playing = False
      if letters_correct == word_len:
          print "You guessed all the letters in the word!"
          print "The word was",word
          keep_playing = False
  
  
  
  while keep_playing == False:
      user = raw_input("\n\tShall we play another game? [y|n] ")
      again = "yes".startswith(user.strip().lower())
      if again:
          keep_playing = True
      if not again:
          break
  
  raw_input ("\n\n\nPress enter to exit")
  </code></pre>