game.py

# A Game is an object that contains a list of all the possible words for each turn of a game of Wordle.
# The game contains an id that is given when initialized and a method called 'guess' that gives the next guess.
class Game():

    def __init__(self, id):
        self.id = id
        with open("words.txt", "r") as file:
            self.words_list = [line.strip() for line in file]

    # The guess method takes in two parameters. word - the previous word used as a guess. result - the number array 
    # that is the result of the previous guess as returned by the server.
    def guess(self, word, result):
        # If there have been no guesses, the game starts with the mathematically best starting Wordle word 'crane'
        # as described in this video by 3Blue1Brown https://www.youtube.com/watch?v=v68zYyaEmEA
        if ((word == 's') and (len(self.words_list) == 15918)):
            return "crane"
        # Checks the word and result both have 5 elements
        if (len(word) != 5 | len(result) != 5):
            print('Guess must be 5 characters.')
            raise Exception
        # Loops through each result and filters the global list variable of this game.
        index = 0
        for value in result:
            letter = word[index]
            # Letter does not appear in the secret word - remove all with the letter
            if value == 0 and word.count(letter) == 1:
                self.words_list = [w for w in self.words_list if letter not in w]
            # If there are duplicates, remove only the words where the letter is in the specific position
            elif value == 0:
                self.words_list = [w for w in self.words_list if w[index] != letter]
            # Letter appears in the secret word, but not in this position - remove all without the letter plus all with the letter
            # in the specific position
            elif value == 1:
                self.words_list = [w for w in self.words_list if letter in w and w[index] != letter]
            # Letter appears in the secret word in this position - remove all without the letter in that specific position
            elif value == 2:
                self.words_list = [w for w in self.words_list if w[index] == letter]
            else:
                print('Unexpected value in response string.')
                raise Exception
            index += 1
        # Just returns the first word in the filtered list
        return self.words_list[0]