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