类

class Student:
    def __init__(self,name,xuehao,phone):
        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))
    def print_phone(self):
        print("{n}的号码是{m}".format(n=self.name,m=self.phone))
    def print_xuehao(self):
        print("我的学号是{n}".format(n=self.xuehao))
    
 #实例化
zhangsan=Student("zhangsan","01","123456")

#调用方法
zhangsan.say_hello()

输出

你好，我是zhangsan,密码是123

zhangsan.print_phone()

输出

zhangsan的号码是123456