Python 3.x 稍后在python上调用本地定义的变量

稍后，我试图回忆这些局部定义的变量（p1、p2、w1、w2）。在我的程序中，我这样做，如果用户输入的不是数字，程序会提示用户他们输入的响应不正确。然而，这导致我的变量在本地定义，我不知道以后如何使用这些本地定义的变量。任何帮助都将不胜感激，谢谢

fp=input("\nWhat percentage do you want to finish the class with?")


def main():
    p1 = get_number("\nWhat is your 1st marking period percentage? ")
    w1 = get_number("\nWhat is the weighting of the 1st marking period? ")
    p2 = get_number("\nWhat is your 2nd marking period percentage? ")
    w2 = get_number("\nWhat is the weighting of the 2nd marking period? ")


def get_number(prompt):
    while True:
        try:
            text = input(prompt)
        except EOFError:
            raise SystemExit()
        else:
            try:
                number = float(text)
            except ValueError:
                print("Please enter a number.")
            else:
                break
    return number


def calculate_score(percentages, weights):
    if len(percentages) != len(weights):
        raise ValueError("percentages and weights must have same length")
    return sum(p * w for p, w in zip(percentages, weights)) / sum(weights)


if __name__ == "__main__":
    main()


mid=input("\nDid your have a midterm exam? (yes or no)")
if mid=="yes":
    midg=input("\nWhat was your grade on the midterm?")
    midw=input("\nWhat is the weighting of the midterm exam?")
elif mid=="no":
    midw=0
    midg=0
fw=input("\nWhat is the weighting of the final exam? (in decimal)")


fg=(fp-(w1*p1)-(w2*p2)-(midw*midg))/(fw)
print("You will need to get a", fg ,"on your final to finish the class with a", fp)

---

将变量从一个作用域传递到另一个作用域的一种方法是

从函数返回它们：

def main():
    p1 = get_number("\nWhat is your 1st marking period percentage? ")
    w1 = get_number("\nWhat is the weighting of the 1st marking period? ")
    p2 = get_number("\nWhat is your 2nd marking period percentage? ")
    w2 = get_number("\nWhat is the weighting of the 2nd marking period? ")

    return p1, w1, p2, w2

然后，在调用
main
函数时，将该函数的输出指定给相应的名称：

if __name__ == "__main__":
    p1, w1, p2, w2 = main()

请注意，您不必调用它们
p1
、
w1
、
p2
、和
w2
。在此阶段，您可以将它们指定给在您工作的范围内有意义的任何名称。这就是在函数外部将事物划分为函数的能力，您不必担心遵循函数内部使用的相同命名约定（您甚至可能不知道）。您还可以将四个输出一起分配/引用为
元组
，即调用：

if __name__ == "__main__":
    numbers = main()

然后将它们称为
数字[0]
，
数字[1]
，
数字[2]
和
数字[3]