函数不能访问它之外的全局变量

Question

所以我有一个程序，其核心是这个

def first():
    global myvar
    myvar = "thing"
        def second():
            print myvar

但是当它没有发生任何事情时，老实说我不知道​​还能做什么

Answer 1

def first():
    global myvar
    myvar = "thing"
    def second():
        print myvar
    second()  #==>call the function or
    return second()  #return the second function

first()