class i:
    class a:
def a():
     print(9)
         def b():
               print(10)

问题解决得话，请点下采纳，谢谢合作

# -*- coding: UTF-8 -*-

class i:
    class a:
        def a(self):
            print(9)
        def b(self):
            print(10)

i1 = i()
a1 = i1.a()
a1.a()
a1.b()