Python在类中附加到数组时复制值

Question

这是我的第一篇 StackOverflow 帖子，如果我做错了什么，请告诉我！我正在尝试用 python 制作纸牌游戏，并被告知使用基于类的系统是最好的。在尝试这样做的同时，当将所有卡片放入一副牌中时，这些类似乎将值复制到代码的 board.cards 部分。#definitions and importsimport randomclass Card:    suit = ""    base = ""class Hand:    cards = []    poweri = 0    powerii = 0class Stack:    cards = []#instantiates classesdeck = Stack()board = Stack()player = Hand()dealer = Hand()#creates ordered empty deckdef newdeck(obj):    for x in ["2","3","4","5","6","7","8","9","A","B","C","D","E"]:        for y in ["C","D","H","S"]:            card = Card()            card.base = x            card.suit = y            obj.cards.append(card)#shuffles deckdef shuffle():    random.shuffle(deck.cards)newdeck(deck)#disabled to make debug easier#shuffle()#prints entire deckprint("\nDeck")for i in range(len(deck.cards)):    print(deck.cards[i].base, deck.cards[i].suit)print(len(deck.cards))#prints entire boardprint("\nBoard")for i in range(len(board.cards)):    print(board.cards[i].base, board.cards[i].suit)板子应该是空的？？？