Question

我是Python的新手，我从未学过任何其他编程语言。我似乎得到了这个错误，我已经阅读了其他帖子，但他们说在[dollar = 0]之前放置全局，这会产生语法错误，因为它不允许[= 0]。我正在使用[美元]作为计数器，所以我可以跟踪我添加到它的内容并在需要时将其显示回来。有人能帮助我吗？感谢。

＆LT;＆GT;代码＆LT;＆GT;

    dollars = 0

    def sol():
        print('Search or Leave?')
        sol = input()
        if sol == 'Search':
            search()
        if sol == 'Leave':
            leave()

    def search():
        print('You gain 5 bucks')
        dollars = dollars + 5
        shop()

    def leave():
        shop()

    def shop():
        shop = input()
        if shop == 'Shortsword':
            if money < 4:
                print('I\'m sorry, but you don\'t have enough dollars to buy that item.')
                shop1()
            if money > 4:
                print('Item purchased!')
                print('You now have ' + dollars + ' dollars.')

    sol()

＆LT;＆GT;回溯＆LT;＆GT;

Traceback (most recent call last):
  File "C:/Users/justin/Python/Programs I Made/Current/Testing.py", line 29, in <module>
    sol()
  File "C:/Users/justin/Python/Programs I Made/Current/Testing.py", line 7, in sol
    search()
  File "C:/Users/justin/Python/Programs I Made/Current/Testing.py", line 13, in search
    dollars = dollars + 5
UnboundLocalError: local variable 'dollars' referenced before assignment

Answer 1

您需要添加global dollars，如下所示

def search():
    global dollars
    print('You gain 5 bucks')
    dollars = dollars + 5
    shop()

每次你想要在函数内部更改global变量时，你需要添加这个语句，你可以只使用dollar语句来访问global变量，

def shop():
    global dollars
    shop = input("Enter something: ")
    if shop == 'Shortsword':
        if dollars < 4:          # Were you looking for dollars?
            print('I\'m sorry, but you don\'t have enough dollars to buy that item.')
            shop1()
        if dollars > 4:
            print('Item purchased!')
            dollars -= someNumber # Change Number here
            print('You now have ' + dollars + ' dollars.')

当你购买东西时，你还需要减少美元！

P.S - 我希望你使用的是Python 3，你需要使用raw_input代替。

Answer 2

您需要将global dollars放在一条线上，在您更改美元值的任何函数内。在您显示的代码中仅显示search()，但我假设您还希望在shop()内执行此操作以减去您购买的商品的价值...

UnBoundLocalError：在分配之前引用的局部变量[Counter]

2 个答案: