python—未解析的引用和I don'；知道为什么吗？

我正在尝试制作一个小程序，告诉你你有多大机会得到一张特别的牌，并询问抽到了什么牌。 当它问起画的是什么卡片时，它会在代码中显示未解析的引用，我不知道这是什么意思或者为什么会这样说

cards = 52

ace = 4
queen = 4
king = 4
jack = 4

two = 4
three = 4
four = 4
five = 4
six = 4
seven = 4
eight = 4
nine = 4
ten = 4  

def ask_what_card_was_drawn():
    drawncard = input("What card did you draw?: ")
    if drawncard == ace:
        ask_what_card_was_drawn()
    elif drawncard == queen:
        queen == queen - 1
        cards == cards - 1
    elif drawncard == jack:

    #code kinda repeats itself here#

    #tried experimenting with -= 1 instead#
    elif drawncard == nine:
        nine == -1
        cards == cards - 1
    elif drawncard == "ten":
        ten -= 1
        cards -= 1
    else:
        print("Error")
    print("Cards left are: ")
    print("Cards = ", cards)
    print("     ace = ", ace)
    #kinda repeated itself again here aswell#
    print("     ten = ", ten)

    ask_what_card_was_drawn()

---

你的代码有很多问题。第一种方法是，在将全局变量投影到本地范围之前引用全局变量，从而导致

UnboundLocalError

。您需要告诉Python您正在使用globals，例如：

def ask_what_card_was_drawn():
    global cards, ace, queen, king, jack, two, three, four, five, size, seven, eight, nine, ten
    drawncard = input("What card did you draw?: ")
    ...

第二个问题是，您正在使用

==

来分配值，而不是

=

。第一个是检查相等性的条件，而第二个是为名称赋值。例如，下面一行：

queen == queen - 1

有效地解释为

False

，因为

queen

不等于

queen-1

。您只需使用一个

=

，如下所示：

queen = queen - 1

或者更好：

queen -= 1

我解决了这个问题。 函数中的变量被设置和更改，这使python变得疯狂。 首先将所有变量设置为全局变量似乎可以解决这个问题

cards = 52

ace = 4
queen = 4
king = 4
jack = 4
two = 4
three = 4
four = 4
five = 4
six = 4
seven = 4
eight = 4
nine = 4
ten = 4
def ask_what_card_was_drawn():
    drawn_card = str(input("What card did you draw?: "))
    global cards

    global ace
    global queen
    global king
    global jack

    global two
    global three
    global four
    global five
    global six
    global seven
    global eight
    global nine
    global ten
    if drawn_card == "ace":
        ace -= 1
        cards -= 1
    elif drawn_card == "queen":
        queen -= 1
        cards -= 1
    elif drawn_card == "jack":
        jack -= 1
        cards -= 1
    elif drawn_card == "king":
        king -= 1
        cards -= 1

---

你能复制准确的错误吗？你甚至不能复制完整的代码。我去粘贴整个代码，但stackoverflow说我的帖子大部分是代码，所以我删除了几行，这样我就可以发布谢谢你Jordan，如果有帮助的话，我会尝试获取更新代码和错误的全屏截图。我只想说，如果我在面试中看到有人用“6=4”行写代码，我不会再看下去了。。。