class User:
    def say_hello(some_user):
        #인사 메세지 출력 메소드
        print('안녕하세요! 저는{}입니다'.format(some_user.name))

user1 = User()
user2 = User()
user3 = User()

user1.name = '김대위'
user1.email = 'captain@codeit.kr'
user1.password = '12345'

user2.name = '강영훈'
user2.email = 'younghoon@codeit.kr'
user2.password = '5678'

user3.name = '최지웅'
user3.email = 'jiwoong@codeit.kr'
user3.password = '!@#dd'

User.say_hello(user1)
User.say_hello(user2)
User.say_hello(user3)