ps5.py

def play_hand(hand, word_list):
    """
    Allows the user to play the given hand, as follows:

    * The hand is displayed.

    * The user may input a word.

    * An invalid word is rejected, and a message is displayed asking
      the user to choose another word.

    * When a valid word is entered, it uses up letters from the hand.

    * After every valid word: the score for that word and the total
      score so far are displayed, the remaining letters in the hand
      are displayed, and the user is asked to input another word.

    * The sum of the word scores is displayed when the hand finishes.

    * The hand finishes when there are no more unused letters.
      The user can also finish playing the hand by inputing a single
      period (the string '.') instead of a word.

    * The final score is displayed.

      hand: dictionary (string -> int)
      word_list: list of lowercase strings
    """
    word = ''
    total_score = 0
    letters_left = HAND_SIZE

    while word <> '.':
        if letters_left == 0:
            return
        print 'Current Hand:',
        display_hand(hand)
        print 'Enter word, or (.) to indicate that you are finished:',
        word = raw_input().lower()
        if word == '.':
            print 'Total score:', total_score, 'points.',
            return
        elif not is_valid_word(word, hand, word_list):
                print 'Invalid word, please try again.'
        else:
            score = get_word_score(word, HAND_SIZE)
            total_score += score
            print word, 'earned', score, 'points. Total:', total_score, 'points'
            hand = update_hand(hand, word)
            letters_left -= len(word)