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 imports

import random

class Card:

    suit = ""

    base = ""

class Hand:

    cards = []

    poweri = 0

    powerii = 0

class Stack:

    cards = []

#instantiates classes

deck = Stack()

board = Stack()

player = Hand()

dealer = Hand()

#creates ordered empty deck

def 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 deck

def shuffle():

    random.shuffle(deck.cards)

newdeck(deck)

#disabled to make debug easier

#shuffle()

#prints entire deck

print("\nDeck")

for i in range(len(deck.cards)):

    print(deck.cards[i].base, deck.cards[i].suit)

print(len(deck.cards))

#prints entire board

print("\nBoard")

for i in range(len(board.cards)):

    print(board.cards[i].base, board.cards[i].suit)

板子应该是空的？？？