如何从函数外部访问函数内部定义的变量 [英] How to access a variable defined inside a function, from outside that function

问题描述

我一直坚持在另一个函数中使用在前一个函数中定义的变量.例如，我有这个代码:

I am stuck on using variables defined in a previous function in another function. For example, I have this code:

def get_two_nums():
    ...
    ...
    op = ...
    num1 = ...
    num2 = ...
    answer = ...

def question():
    response = int(input("What is {} {} {}? ".format(num1, op, num2)))
    if response == answer:
        .....

我将如何在第二个函数中使用第一个函数中定义的变量?提前谢谢您

How will I use the variables defined in the first function in the second function? Thank you in advance

推荐答案

变量是函数的局部变量；您需要返回您想要共享给调用者的相关值，并将它们传递给使用它们的下一个函数.像这样:

Variables are local to the functions; you need to return the relevant values you want to share to the caller and pass them to the next function that uses them. Like this:

def get_two_nums():
    ...
    # define the relevant variables
    return op, n1, n2, ans

def question(op, num1, num2, answer):
    ...
    # do something with the variables

现在你可以打电话了

question(*get_two_nums()) # unpack the tuple into the function parameters

或

op, n1, n2, ans = get_two_nums()
question(op, n1, n2, ans)

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