我有一个非常基本的问题。
假设我调用一个函数，例如
def foo(): x = 'hello world'
如何获得以返回x的功能，以便可以将x用作另一个函数的输入或在程序主体中使用变量？
当我使用return并在另一个函数中调用变量时，我得到了NameError。
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
