Python中nonlocal的用法

class Text:
    def __init__(self):
        pass
    def big(self):
        n, m = 0, 0
        def a():
            nonlocal n
            n += 1
            print(n)
            if n == 1:
                print('one')
            elif n == 2:
                print('two')
        a()
        a()
if __name__ == '__main__':
    text = Text()
    text.big()

打印结果：

1
one
2
two