def gong(self, dealer, cards):
        ''' Perform Gong
        Args:
            dealer (object): Dealer
            Cards (object): The cards to be Gong.
        '''
        for card in cards:
            if card in self.hand:
                self.hand.pop(self.hand.index(card))
        self.pile.append(cards)
 Perform Gong
        Args:
            dealer (object): Dealer
            Cards (object): The cards to be Gong.
        
rlcard/games/mahjong/player.py