def is_over(self):
        ''' Judge whether a game is over

        Returns:
            Bool: True(over) / False(not over)
        '''
        if self.winner_id is None:
            return False
        return True
 Judge whether a game is over

        Returns:
            Bool: True(over) / False(not over)
        
rlcard/games/doudizhu/game.py