mooc课程mit6.00.1x--problemset3解决方法

 1 def radiationExposure(start, stop, step): 2     ''' 3     Computes and returns the amount of radiation exposed 4     to between the start and stop times. Calls the  5     function f (defined for you in the grading script) 6     to obtain the value of the function at any point. 7  8     start: integer, the time at which exposure begins 9     stop: integer, the time at which exposure ends10     step: float, the width of each rectangle. You can assume that11       the step size will always partition the space evenly.12 13     returns: float, the amount of radiation exposed to 14       between start and stop times.15     '''16     # FILL IN YOUR CODE HERE...17     area = 018     while start <  stop:19         area = area + f(start) * step20         start += step21 22     return area

  1 # 6.00 PRoblem Set 3  2 #   3 # Hangman game  4 #  5   6 # -----------------------------------  7 # Helper code  8 # You don't need to understand this helper code,  9 # but you will have to know how to use the functions 10 # (so be sure to read the docstrings!) 11  12 import random 13 import string 14  15 WORDLIST_FILENAME = "words.txt" 16  17 def loadWords(): 18     """ 19     Returns a list of valid words. Words are strings of lowercase letters. 20  21     Depending on the size of the word list, this function may 22     take a while to finish. 23     """ 24     print "Loading word list from file..." 25     # inFile: file 26     inFile = open(WORDLIST_FILENAME, 'r', 0) 27     # line: string 28     line = inFile.readline() 29     # wordlist: list of strings 30     wordlist = string.split(line) 31     print "  ", len(wordlist), "words loaded." 32     return wordlist 33  34 def chooseWord(wordlist): 35     """ 36     wordlist (list): list of words (strings) 37     Returns a word from wordlist at random 38     """ 39     return random.choice(wordlist) 40  41 # end of helper code 42 # ----------------------------------- 43  44 # Load the list of words into the variable wordlist 45 # so that it can be accessed from anywhere in the program 46 wordlist = loadWords() 47  48 def isWordGuessed(secretWord, lettersGuessed): 49     ''' 50     secretWord: string, the word the user is guessing 51     lettersGuessed: list, what letters have been guessed so far 52     returns: boolean, True if all the letters of secretWord are in  53         lettersGuessed; False otherwise 54     ''' 55     # FILL IN YOUR CODE HERE... 56     for c in secretWord: 57         if c not in lettersGuessed: 58             return False 59  60     return True 61  62 def getGuessedWord(secretWord, lettersGuessed): 63     ''' 64     secretWord: string, the word the user is guessing 65     lettersGuessed: list, what letters have been guessed so far 66     returns: string, comprised of letters and underscores that represents 67       what letters in secretWord have been guessed so far. 68     ''' 69     # FILL IN YOUR CODE HERE... 70     guess = "" 71     for c in secretWord: 72         if c in lettersGuessed: 73             guess += c 74         else: 75             guess += "_ " 76  77     return guess 78  79 def getAvailableLetters(lettersGuessed): 80     ''' 81     lettersGuessed: list, what letters have been guessed so far 82     returns: string, comprised of letters that represents what letters have not 83       yet been guessed. 84     ''' 85     # FILL IN YOUR CODE HERE... 86     available = "" 87     for c in string.ascii_lowercase: 88         if c not in lettersGuessed: 89             available += c 90  91     return available 92  93 def hangman(secretWord): 94     ''' 95     secretWord: string, the secret word to guess. 96     Starts up an interactive game of Hangman. 97     * At the start of the game, let the user know how many  98       letters the secretWord contains. 99     * Ask the user to supply one guess (i.e. letter) per round.100     * The user should receive feedback immediately after each guess 101       about whether their guess appears in the computers word.102     * After each round, you should also display to the user the 103       partially guessed word so far, as well as letters that the 104       user has not yet guessed.105     Follows the other limitations detailed in the problem write-up.106     '''107     # FILL IN YOUR CODE HERE...108     print "Welcome to the game Hangman!"109     print "I am thinking of a word that is", len(secretWord), "letters long."110     print "-------------"111     lettersGuessed = []112     mistakesMade = 0113     availableLetters = string.ascii_lowercase114 115     while mistakesMade < 8 and not isWordGuessed(secretWord, lettersGuessed):116         print "You have", 8 - mistakesMade, "guesses left."117         print "Available letters:", availableLetters118         guess = raw_input("Please guess a letter: ").lower()119 120         if guess in lettersGuessed:121             print("Oops! You've already guessed that letter: " +122                 getGuessedWord(secretWord, lettersGuessed))123         elif guess in secretWord:124             lettersGuessed.append(guess)125             print "Good guess:", getGuessedWord(secretWord, lettersGuessed)126         else:127             mistakesMade += 1128             lettersGuessed.append(guess)129             print("Oops! That letter is not in my word: " + 130                 getGuessedWord(secretWord, lettersGuessed))131 132         availableLetters = getAvailableLetters(lettersGuessed)133 134         print "------------"135 136     if isWordGuessed(secretWord, lettersGuessed):137         print "Congratulations, you won!"138     else:139         print("Sorry, you ran out of guesses. The word was " + secretWord + 140             ".")141 142 # When you've completed your hangman function, uncomment these two lines143 # and run this file to test! (hint: you might want to pick your own144 # secretWord while you're testing)145 146 secretWord = chooseWord(wordlist).lower()147 hangman(secretWord)