如何从函数中获取结果（输出）？以后如何使用结果？

假设我有一个类似的函数：

def foo():
    x = 'hello world'

如何让函数返回x，这样我就可以将它用作另一个函数的输入或在程序体内使用该变量？我尝试使用return然后使用x另一个函数中的变量，但我得到了NameError那样。

_{For the specific case of communicating information between methods in the same class, it is often best to store the information in self. See Passing variables between methods in Python? https://stackoverflow.com/questions/9520075/ for details.}

您可以使用return https://docs.python.org/3/reference/simple_stmts.html#return从函数返回值的语句，thisdoes not使返回的变量（值）在scope https://stackoverflow.com/questions/291978/short-description-of-the-scoping-rules来电者的。要在调用方中使用该值，您可以直接在语句中使用它或捕获变量中的值。

下面是一些代码来演示这一点：

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