How to do a Hangman in Python

Code:

from random import *
import sys

player_score = 0
computer_score = 0

def start():
    print('Let’s play a game of Hangman.')
    while game():
        pass
    scores()

def game():
    dictionary = ['Hola','Adiós']
    word = choice(dictionary)
    word_length = len(word)
    clue = word_length * ['_']
    tries = 6
    letters_tried = ''
    guesses = 0
    letters_right = 0
    letters_wrong = 0
    global computer_score, player_score

    def guess_letter():
        print()
        letter = input('Take a guess at our mystery word:')
        letter.strip()
        letter.lower()
        print()
        return letter

    def play_again():
        answer = input('Would you like to play again? y/n: ')
        if answer in ('y', 'Y', 'yes', 'Yes', 'Of course!'):
            return answer
        else:
            print('Thank you very much for playing our game. See you next time!')
            sys.exit()

    def scores():
        global player_score, computer_score
        print('HIGH SCORES')
        print('Player: ', player_score)
        print('Computer: ', computer_score)

        if __name__ == '__main__':
            start()

    while (letters_wrong != tries) and (''.join(clue) != word):
        letter = guess_letter()
        if len(letter) == 1 and letter.isalpha():
            if letters_tried.find(letter) != -1:
                print('You’ve already picked', letter)
            else:
                letters_tried = letters_tried + letter
                first_index = word.find(letter)
                if first_index == -1:
                    letters_wrong += 1
                    print('Sorry,' + letter + ' isn’t what we’re looking for.')
                else:
                    print('Congratulations,', letter, 'is correct.')
                    for i in range(word_length):
                        if letter == word[i]:
                            clue[i] = letter

        else:
            print('Choose another.')

        print(' '.join(clue))
        print('Guesses: ', letters_tried)

        if letters_wrong == tries:
            print('Game Over.')
            print('The word was', word)
            computer_score += 1
            break
        if ''.join(clue) == word:
            print('You Win!')
            print('The word was', word)
            player_score += 1
            break
    return play_again()


start()