Python - 函数的输出?

问题描述

我有一个非常基本的问题.

I have a very rudimentary question.

假设我调用了一个函数，例如

Assume I call a function, e.g.,

def foo():
    x = 'hello world'

如何让函数返回 x 以便我可以将其用作另一个函数的输入或在程序体内使用变量?

How do I get the function to return x in such a way that I can use it as the input for another function or use the variable within the body of a program?

当我使用 return 并在另一个函数中调用该变量时，我得到一个 NameError.

When I use return and call the variable within another functions I get a NameError.

推荐答案

def foo():
    x = 'hello world'
    return x  # return 'hello world' would do, too

foo()
print x    # NameError - x is not defined outside the function

y = foo()
print y    # this works

x = foo()
print x    # this also works, and it's a completely different x than that inside
           # foo()

z = bar(x) # of course, now you can use x as you want

z = bar(foo()) # but you don't have to

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