9-3

class User():

    def __init__(self,first_name,last_name,other):
        self.first_name = first_name
        self.last_name = last_name
        self.other = other

    def describe_user(self):
        print(self.first_name,self.last_name,self.other)

    def greet_user(self):
        print('Hello,'+ self.first_name + ' ' + self.last_name)

user = User('cao','feng','yanan')
user.describe_user()
user.greet_user()

user = User('bai','jihong','yanan')
user.describe_user()
user.greet_user()

user = User('cao','xinyue','yanan')
user.describe_user()
user.greet_user()