# 定义Student类
class Student:
                          
    def __init__(self,name,xuehao,phone):          # 初始化函数
        self.name = name
        self.xuehao = xuehao
        self.phone = phone
        self.__password = '123'  
        
    def say_hello(self):
        print("你好，我是{n}，密码是{p}".format(n=self.name,p=self.__password))
        self.print_phone()
    
    def print_phone(self):
        print("你好，我是{n}，我的电话是{m}".format(n=self.name,m=self.phone))

# 实例化
zhangsan = Student("zhangsan","01","123456")

# 属性

zhangsan.xuehao

'01'

# 调用方法
zhangsan.say_hello()

你好，我是zhangsan，密码是123
你好，我是zhangsan，我的电话是123456

zhangsan.print_phone()

你好，我是zhangsan，我的电话是123456