def step(self, action):
        ''' Perform one draw of the game

        Args:
            action (str): specific action of doudizhu. Eg: '33344'

        Returns:
            dict: next player's state
            int: next player's id
        '''
        if self.allow_step_back:
            # TODO: don't record game.round, game.players, game.judger if allow_step_back not set
            pass

        # perfrom action
        player = self.players[self.round.current_player]
        self.round.proceed_round(player, action)
        if (action != 'pass'):
            self.judger.calc_playable_cards(player)
        if self.judger.judge_game(self.players, self.round.current_player):
            self.winner_id = self.round.current_player
        next_id = (player.player_id+1) % len(self.players)
        self.round.current_player = next_id

        # get next state
        state = self.get_state(next_id)
        self.state = state

        return state, next_id
 Perform one draw of the game

        Args:
            action (str): specific action of doudizhu. Eg: '33344'

        Returns:
            dict: next player's state
            int: next player's id
        
rlcard/games/doudizhu/game.py