Question

我正在编写一个简单的计算器程序，并且最初设置了价格变量。但是，当我输入一个函数时，它将清除我的变量数据，并说该变量是未定义的，即使它已经在程序的前面明确定义了。

n = int(input("How many tickets would you like?"))
cls()
if n >= 10:
    print("Your group is large enough for our group discount!")
    price = n * 5
else:
    price = n * 6
def vet():
    vet = input("Are you a veteran of any branch of the United States 
    Military?")

    if vet.lower() in ['y', 'yes']:
        print("Thank you for your service. Your discount has been applied.")
        price *= 0.90

在此之前和之后当然还有更多的代码，但似乎输入此函数才使我的变量值清除。我觉得好像缺少一个明显的答案，我们将不胜感激。

Answer 1

为使我在上面的评论清楚，这是处理您遇到的问题的方法。它显式传递价格，然后返回价格，而不是依赖范围外的变量。

n = int(input("How many tickets would you like?"))
cls()
if n >= 10:
    print("Your group is large enough for our group discount!")
    price = n * 5
else:
    price = n * 6

def ask_vet(price):
    is_vet = input("Are you a veteran of any branch of the United States Military?")
    if is_vet.lower() in ['y', 'yes']:
        print("Thank you for your service. Your discount has been applied.")
        price *= 0.90
    return price
price = ask_vet(price)

Answer 2

如果将价格声明为全局变量，它将起作用。如果您有任何麻烦，请告诉我。

n = int(input("How many tickets would you like? "))
if n >= 10:
    print("Your group is large enough for our group discount!")
    price = n * 5
else:
    price = n * 6
def vet():
    global price
    vet = input("Are you a veteran of any branch of the United States 
    Military? ")

    if vet.lower() in ['y', 'yes']:
        print("Thank you for your service. Your discount has been applied.")
        price *= 0.90

输入def时变量失去值python

2 个答案: