Hangman

hangman.py

from re import compile


class Hangman:
    """Play Hangman"""
    
    def __init__(self, word="demo", chances=3):
        """Initialize the game with the correct word and number of chances"""
        self.wordPattern = compile("^[a-z]+$")
        self.guessPattern = compile("^[a-z]$")

        if not self.wordPattern.match(word):
            raise ValueError("The word should contain only alphabets.")
        if chances < 1:
            raise ValueError("At least 1 chance should be provided.")

        self.word = list(word.lower())
        self.currWord = list('#' * len(word))
        self.chances = chances
        self.history = set()

    def guess(self, ch):
        """Guess an alphabet from the word"""
        if not self.guessPattern.match(ch):
            print("Please guess a single lowercase alphabet.")
            return False

        if ch in self.history:
            print("Already guessed", ch)
            return False

        self.history.add(ch)

        count = 0
        for i in range(len(self.word)):
            if self.word[i] == ch:
                self.currWord[i] = ch
                count += 1

        if count == 0:
            self.chances -= 1
            print("Sorry, wrong guess!")
        else:
            print("The guess is right!")

        return count > 0

    def run(self):
        """driver for the game"""
        print("Welcome to Hangman! You have", self.chances,
              "to guess the correct word!")
        while self.chances > 0:
            print(self.chances, "left.", self.currWord)

            alphabet = input("Guess an alphabet")
            self.guess(alphabet)

            if self.word == self.currWord:
                print("You Win! The word was", "".join(self.currWord))
                return True

        print("You lose!")
        return False


Hangman("abracadabra", 3).run()