Python 全局变量：对我来说太全局了

Question

Below, I would like the s var be global to the f function, but local to the principal function.

It seems global means "The Most Global in the Module". How can I make one less global scope?

s="what the hell"
print(s)

def principal():
    s ="hey"
    def f():
        global s 
        if len(s) < 8:
            s += " !"
            f()

    f()
    return s
print(principal())

what the hell
hey

Answer 1

I'm not sure if this is what you are going for, since global has an unambiguous meaning in Python. If you want to modify the variable s as defined in principal() within f() you can use nonlocal :

s="what the hell"
print(s)

def principal():
    s = "hey"
    def f():
        nonlocal s 
        if len(s) < 8:
            s += " !"
            f()

    f()
    return s
print(principal())

But the real goal here would probably be, to avoid constructs like that altogether and pass the respective variables as arguments and return the modified values from (pure) functions.