# 6.00 Problem Set 6 # # The 6.00 Word Game # import random import string VOWELS = 'aeiou' CONSONANTS = 'bcdfghjklmnpqrstvwxyz' HAND_SIZE = 7 SCRABBLE_LETTER_VALUES = { 'a': 1, 'b': 3, 'c': 3, 'd': 2, 'e': 1, 'f': 4, 'g': 2, 'h': 4, 'i': 1, 'j': 8, 'k': 5, 'l': 1, 'm': 3, 'n': 1, 'o': 1, 'p': 3, 'q': 10, 'r': 1, 's': 1, 't': 1, 'u': 1, 'v': 4, 'w': 4, 'x': 8, 'y': 4, 'z': 10 } # ----------------------------------- # Helper code # (you don't need to understand this helper code) WORDLIST_FILENAME = "words.txt" def load_words(): """ Returns a list of valid words. Words are strings of lowercase letters. Depending on the size of the word list, this function may take a while to finish. """ print "Loading word list from file..." # inFile: file inFile = open(WORDLIST_FILENAME, 'r', 0) # wordlist: list of strings wordlist = [] for line in inFile: wordlist.append(line.strip().lower()) print " ", len(wordlist), "words loaded." return wordlist def get_frequency_dict(sequence): """ Returns a dictionary where the keys are elements of the sequence and the values are integer counts, for the number of times that an element is repeated in the sequence. sequence: string or list return: dictionary """ # freqs: dictionary (element_type -> int) freq = {} for x in sequence: freq[x] = freq.get(x,0) + 1 return freq # (end of helper code) # ----------------------------------- # # Problem #1: Scoring a word # def get_word_score(word, n): """ Returns the score for a word. Assumes the word is a valid word. The score for a word is the sum of the points for letters in the word, plus 50 points if all n letters are used on the first go. Letters are scored as in Scrabble; A is worth 1, B is worth 3, C is worth 3, D is worth 2, E is worth 1, and so on. word: string (lowercase letters) returns: int >= 0 """ score = 0 for letter in word: score += SCRABBLE_LETTER_VALUES[letter.lower()] if len(word) == n: score += 50 return score # # Make sure you understand how this function works and what it does! # def display_hand(hand): """ Displays the letters currently in the hand. For example: display_hand({'a':1, 'x':2, 'l':3, 'e':1}) Should print out something like: a x x l l l e The order of the letters is unimportant. hand: dictionary (string -> int) """ for letter in hand.keys(): for j in range(hand[letter]): print letter, # print all on the same line print # print an empty line # # Make sure you understand how this function works and what it does! # def deal_hand(n): """ Returns a random hand containing n lowercase letters. At least n/3 the letters in the hand should be VOWELS. Hands are represented as dictionaries. The keys are letters and the values are the number of times the particular letter is repeated in that hand. n: int >= 0 returns: dictionary (string -> int) """ hand={} num_vowels = n / 3 for i in range(num_vowels): x = VOWELS[random.randrange(0,len(VOWELS))] hand[x] = hand.get(x, 0) + 1 for i in range(num_vowels, n): x = CONSONANTS[random.randrange(0,len(CONSONANTS))] hand[x] = hand.get(x, 0) + 1 return hand # # Problem #2: Update a hand by removing letters # def update_hand(hand, word): """ Assumes that 'hand' has all the letters in word. In other words, this assumes that however many times a letter appears in 'word', 'hand' has at least as many of that letter in it. Updates the hand: uses up the letters in the given word and returns the new hand, without those letters in it. word: string hand: dictionary (string -> int) returns: dictionary (string -> int) """ freq = get_frequency_dict(word) newhand = {} for char in hand: newhand[char] = hand[char]-freq.get(char,0) return newhand #return dict( ( c, hand[c] - freq.get(c,0) ) for c in hand ) # # Problem #3: Test word validity # def is_valid_word(word, hand, word_list): """ Returns True if word is in the word_list and is entirely composed of letters in the hand. Otherwise, returns False. Does not mutate hand or word_list. word: string hand: dictionary (string -> int) word_list: list of lowercase strings """ freq = get_frequency_dict(word) for letter in word: if freq[letter] > hand.get(letter, 0): return False return word in word_list # # Problem #4: Playing a hand # 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 is 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. hand: dictionary (string -> int) word_list: list of lowercase strings """ total = 0 initial_handlen = sum(hand.values()) while sum(hand.values()) > 0: print 'Current Hand:', display_hand(hand) userWord = raw_input('Enter word, or a . to indicate that you are finished: ') if userWord == '.': break else: isValid = is_valid_word(userWord, hand, word_list) if not isValid: print 'Invalid word, please try again.' else: points = get_word_score(userWord, initial_handlen) total += points print '%s earned %d points. Total: %d points' % (userWord, points, total) hand = update_hand(hand, userWord) print 'Total score: %d points.' % total # # Problem #5: Playing a game # Make sure you understand how this code works! # def play_game(word_list): """ Allow the user to play an arbitrary number of hands. * Asks the user to input 'n' or 'r' or 'e'. * If the user inputs 'n', let the user play a new (random) hand. When done playing the hand, ask the 'n' or 'e' question again. * If the user inputs 'r', let the user play the last hand again. * If the user inputs 'e', exit the game. * If the user inputs anything else, ask them again. """ hand = deal_hand(HAND_SIZE) # random init while True: cmd = raw_input('Enter n to deal a new hand, r to replay the last hand, or e to end game: ') if cmd == 'n': hand = deal_hand(HAND_SIZE) play_hand(hand.copy(), word_list) print elif cmd == 'r': play_hand(hand.copy(), word_list) print elif cmd == 'e': break else: print "Invalid command." # # Build data structures used for entire session and play game # if __name__ == '__main__': word_list = load_words() play_game(word_list)