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import time class Game: def __init__(self): self.initialize_game() def initialize_game(self): self.current_state = [['.','.','.'], ['.','.','.'], ['.','.','.']] self.player_turn = 'X' def draw_board(self): for i in range(0, 3): for j in range(0, 3): print('{}|'.format(self.current_state[i][j]), end=" ") print() print() def is_valid(self, px, py): if px < 0 or px > 2 or py < 0 or py > 2: return False elif self.current_state[px][py] != '.': return False else: return True def is_end(self): for i in range(0, 3): if (self.current_state[0][i] != '.' and self.current_state[0][i] == self.current_state[1][i] and self.current_state[1][i] == self.current_state[2][i]): return self.current_state[0][i] for i in range(0, 3): if (self.current_state[i] == ['X', 'X', 'X']): return 'X' elif (self.current_state[i] == ['O', 'O', 'O']): return 'O' if (self.current_state[0][0] != '.' and self.current_state[0][0] == self.current_state[1][1] and self.current_state[0][0] == self.current_state[2][2]): return self.current_state[0][0] if (self.current_state[0][2] != '.' and self.current_state[0][2] == self.current_state[1][1] and self.current_state[0][2] == self.current_state[2][0]): return self.current_state[0][2] for i in range(0, 3): for j in range(0, 3): if (self.current_state[i][j] == '.'): return None return '.' def max_alpha_beta(self, alpha, beta): maxv = -2 px = None py = None result = self.is_end() if result == 'X': return (-1, 0, 0) elif result == 'O': return (1, 0, 0) elif result == '.': return (0, 0, 0) for i in range(0, 3): for j in range(0, 3): if self.current_state[i][j] == '.': self.current_state[i][j] = 'O' (m, min_i, in_j) = self.min_alpha_beta(alpha, beta) if m > maxv: maxv = m px = i py = j self.current_state[i][j] = '.' if maxv >= beta: return (maxv, px, py) if maxv > alpha: alpha = maxv return (maxv, px, py) def min_alpha_beta(self, alpha, beta): minv = 2 qx = None qy = None result = self.is_end() if result == 'X': return (-1, 0, 0) elif result == 'O': return (1, 0, 0) elif result == '.': return (0, 0, 0) for i in range(0, 3): for j in range(0, 3): if self.current_state[i][j] == '.': self.current_state[i][j] = 'X' (m, max_i, max_j) = self.max_alpha_beta(alpha, beta) if m < minv: minv = m qx = i qy = j self.current_state[i][j] = '.' if minv <= alpha: return (minv, qx, qy) if minv < beta: beta = minv return (minv, qx, qy) def play_alpha_beta(self): while True: self.draw_board() self.result = self.is_end() if self.result != None: if self.result == 'X': print('The winner is X!') elif self.result == 'O': print('The winner is O!') elif self.result == '.': print("It's a tie!") self.initialize_game() return if self.player_turn == 'X': while True: start = time.time() (m, qx, qy) = self.min_alpha_beta(-2, 2) end = time.time() print('Evaluation time: {}s'.format(round(end - start, 7))) print('Recommended move: X = {}, Y = {}'.format(qx, qy)) px = int(input('Insert the X coordinate: ')) py = int(input('Insert the Y coordinate: ')) qx = px qy = py if self.is_valid(px, py): self.current_state[px][py] = 'X' self.player_turn = 'O' break else: print('The move is not valid! Try again.') else: (m, px, py) = self.max_alpha_beta(-2, 2) self.current_state[px][py] = 'O' self.player_turn = 'X' def main(): g = Game() g.play_alpha_beta() if __name__ == "__main__": main()
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