class User():
    first_name = '郭'
    last_name = '斌'

    def describe_user(self):
        print(self.first_name)

    def greet_user(self):
        print('哈喽老铁')

u = User()
u.describe_user()
u.greet_user()

   
a = User()
a.describe_user()
a.greet_user()



