""" class OldboyStudent():     def __init__(self,name,age,sex):         self.name = name         self.age = age         self.sex = sex s1 = OldboyStudent('李坦克','男',18) s2 = OldboyStudent('欧阳','men',18) s3 = OldboyStudent('li','men',22) a = s1.name print(a) s2.name = '王三炮' print(s2.name) s2.course = 'python' b = s2.__dict__ print(b) del s2.course c = s2.__dict__ print(c) print(id(OldboyStudent)) print(id(s1.name)) print(id(s2.name)) """ """ class OldboyStudent():     school = 'oldboy'     def __init__(self,name,age,sex):         self.name = name         self.age = age         self.sex = sex     def learn(self):         print("%s is learning"%self.name)     def eat(self):         print("%s is eating"%self.name)     def sleep(self):         print("%s is sleeping" %self.name) s1 = OldboyStudent('李坦克','男',18) s2 = OldboyStudent('欧阳','men',18) s3 = OldboyStudent('li','men',22) # OldboyStudent.learn(s1) # OldboyStudent.eat(s2) # OldboyStudent.sleep(s3) # a = OldboyStudent.school # print(a) s1.learn() """ """ class student():     def __init__(self,name,age,high):         self.name = name         self.age = age         self.high = high     def learn(self):         print("好好学习！！！！")     def eat(self):         print("好好吃饭")     def sleep(self):         print("好好睡觉！！！") s2 = student('xiaohui',18,170) s2.learn() s2.sleep() """ import time class libai():     def __init__(self,name,age):         self.name =name         self.age = age     def mingcheng(self):         print("我的名字是 %s " %self.name)     def gjl(self):         a = self.age + 2         return a     def smz(self):         b = 100         return b class hanxin():     def __init__(self, name, age):         self.name = name         self.age = age     def mingcheng(self):         print("我的名字是 %s " % self.name)     def gjl(self):         a = self.age + 14         return a     def smz(self):         b = 100         return b s1 = libai('李白',20) s2 = hanxin('韩信',19) def ooo():     H = 100     L = 100     d = 1     while True:         d+=1         print('李白打韩信')         H =H - s1.gjl()         print("韩信的生命值",H)         time.sleep(1)         print('韩信打李白')         L = L-s2.gjl()         print("李白的生命值",L)         time.sleep(1)         if H <= 0:             print("韩信已经死亡")             break         elif L <= 0:             print("李白已经死亡")             break         else:             print("第 " +  str(d) + "回合开始")     print("游戏结束！！") username = input("你叫什么名字？") lll = input("你好" + username +"这是一个韩信和李白的凄惨爱情故事 " '输入 ok 开始游戏！！！') if lll == 'ok':     ooo()

""" class One:     pass class Two:     pass class Three(One):     pass class Four(Two):     pass a = Three.__bases__ print(a) b = Four.__bases__ print(b) c = One.__bases__ print(c) d = Two.__bases__ print(d) """ class animal:     def __init__(self,name):         self.name = name     def eat(self):         print('吃')     def sleep(self):         print("睡觉")     def jiao(self):         print("叫") class pople(animal):     def f1(self):         print('玩游戏') class pig(animal):     def f2(self):         print("打滚") class dog(animal):     def f3(self):         print("看家护院") a = pople.sleep('xiaoming') r = dog('buqi') r.jiao() pople.f1("xiaohong") pople.__f1__

# 示范代码 """ class A(object):     def test(self):         print("from A") class B(A):     def test(self):         print("from B") class C(A):     def test(self):         print('from C') class D(B):     def test(self):         print('from D') class E(C):     def test(self):         print("from E") def F(D):     def test(self):         print("from F")     pass f1 = F("xiaohui") f1.test print(F.test) """ # 下面两个都是继承 # 在子类中调用父类的方法 """ class Vehice:     Country = 'china'     def __init__(self,name,speed,load,power):         self.name = name         self.speed = speed         self.load = load         self.poert = power     def run(self):         print('开车了！！！！') class Subway(Vehice):     def __init__(self,name,speed,load,power,line):         Vehice.__init__(self,name,speed,load,power)         self.line = line     def run(self):         print("地铁%s 号线欢迎您" %self.name)         Vehice.run(self) line1 = Subway('中国地铁','300m/s','100人/厢','电','1') line1.run() """ # 用了super """ class Vehice:     Country = 'china'     def __init__(self,name,speed,load,power):         self.name = name         self.speed = speed         self.load = load         self.poert = power     def run(self):         print('开车了！！！！') class Subway(Vehice):     def __init__(self,name,speed,load,power,line):         super().__init__(name,speed,load,power)         self.line = line     def run(self):         print("地铁%s 号线欢迎您" %self.name)         Vehice.run(self) class Mobike(Vehice):     def dan(self):         print("哇呜呜呜呜呜 ，小单车来了") line1 = Subway('中国地铁','300m/s','100人/厢','电','1') line1.run() """ # 组合 """ class Equip:     def fire(self):         print("release Fire skill") class Riven:     camp = 'Noxus'     def __init__(self,nickname):         self.nicknsme = nickname         self.equip = Equip() r1 = Riven('ouayng') r1.equip.fire()#可以使用组合的类产生的对象所持有的方法 """ # 用组合的方式建立了类与组合的类之间的关系，他是一种'有'的关系，比如教授有生日，教授教python和linux课程 # 教授有学生s1,s2,s3 # example class pople:     def __init__(self,name,age,sex):         self.name = name         self.age = age         self.sex = sex class Course:     def __init__(self,name,period,price):         self.name = name         self.period = period         self.price = price     def tell_info(self):         print('<%s %s %s>'%(self.name,self.period,self.price)) class Teacher(pople):     def __init__(self,name,age,sex,job_title):         super().__init__(name,age,sex)         self.job_title = job_title         self.course = []         self.student = [] class Student(pople):     def __init__(self,name,age,sex):         super().__init__(name,age,sex)         self.course = [] egon = Teacher('egon',18,'men','沙河霸道金牌讲师') s1 = Student('张三',20,'men') # 创建课程 python = Course('python','3mons',3000.0) linux = Course('linux','2mons',4000.0) # 为老师和学生添加课程 egon.course.append(python) egon.course.append(linux) s1.course.append(python) # 为老师添加学生 egon.student.append(s1) for i in egon.course:     print(i) for i in egon.student:     print(i) r = egon.student print(r)

# 多态与多态性 # 多态指的是一类事物有多种形态，比如动物有多种形态：人，猪，狗 """ s = str('hello') l = list([1,2,3]) t = tuple((4,5,6)) s.__len__() l.__len__() t.__len__() len(s) len(l) len(t) """ # 封装 # 封装 = 隐藏 # 在python中，用双下划线（__）开头的方式将属性隐藏起来 # 其实这仅仅是一种变形操作 # 类中所有双下划綫开头的名称如__x都会自动变形成： _类名__x的形式： #正常情况 """ class A:     def fa(self):         print('from A')     def test(self):         self.fa() class B(A):     def fa(self):         print('from B') b = B() b.test() """ # 吧fa定义成私有的，即__fa """ class A:     def __fa(self):         print('from A')     def test(self):         self.__fa() class B(A):     def __fa(self):         print('from B') b = B() b.test() """ # 封装不是单纯意义的隐藏 # 1、封装数据 # 将数据隐藏起来不是目的。隐藏起来然后对外提供操作该数据的接口， # 然后我们可以在接口附加上对该数据上操作的限制，以此完成对数据属性操作的严格控制 """ class Teacher:     def __init__(self,name,age):         self.__name = name         self.__age = age     def tell_info(self):         print('姓名：%s,年龄：%s' %(self.__name,self.__age))     def set_info(self,name,age):         if not isinstance(name,str):             raise  TypeError('姓名必须是字符串类型')         if not isinstance(age,int):             raise TypeError("年龄必须是整数型")         self.__name = name         self.__age = age t = Teacher("ouyang",18) t.tell_info() r = Teacher("xiaohui",19) r.set_info('ll',12) """ # 2、封装方法：目的是隔离复杂度 # 取款是功能，而这个功能有很多的功能组成：插卡，密码认证，输入金额，打印账单，取钱 # 而对于使用者来说，只需要知道取款这个功能即可，其余功能我们都可以隐藏起来， # 很明显这么做隔离了复杂度，同时也提升了安全性 """ class ATM:     def _card(self):         print('插卡')     def _suth(self):         print('用户认证')     def _input(self):         print('输入取款金额')     def _print_bill(self):         print("打印账单")     def _take_money(self):         print('取款')     def withdraw(self):         self._card()         self._suth()         self._input()         self._print_bill()         self._take_money() a = ATM() a.withdraw() """ # *****特性(property)****** # property 是一种特殊的属性，访问他时会执行一段功能(函数)然后返回值 # Ex：BMI指数 188页 """ class People:     def __init__(self,name,weight,height):         self.name = name         self.weight = weight         self.height = height     @property     def bmi(self):         return self.weight / (self.height**2) p1 = People('ouyang',75,1.75) print(p1.bmi) """ # ex:'晓晖' """ class People:     def __init__(self,name,weight,height):         self.name = name         self.weight = weight         self.height = height     @property     def bmi(self):         return self.weight/(self.height**2) p1 = People('xiaohui',65,1.60) print(p1.bmi) """ # example 二 # 圆的周长和面积 """ import math class Circle:     def __init__(self,radius):         self.radius = radius     @property     def area(self):#area面积         return math.pi*self.radius**2     @property     def perimeter(self):#perimeter周长         return math.pi*2*self.radius c = Circle(10) print(c.radius) print(c.area) print(c.perimeter) """ # 绑定方法 # 绑定给对象的方法 # 绑定给类的方法（classmethod） # classmethod是给类用的，即绑定到类，类在使用时会将类本身当做参数传给 # 类方法的第一个参数（即是对象来调用也会将类当做第一个参数传入） # python为我们内置了函数classmethod来把类中的函数定义成类方法 # 非绑定方法 在内部用staticmethod 装饰的函数即非绑定方法，就是普通函数 # statimethod不与类或对象绑定，谁都可以调用，没有自动传值效果 """ import hashlib import time class MySQL:     def __init__(self,host,port):         self.id = self.create_id()         self.host = host         self.port = port     @staticmethod     def create_id():         m = hashlib.md5(str(time.time()).encode( 'utf-8'))         return m.hexdigest() print(MySQL.create_id()) conn = MySQL('127.0.0.1',3306) print(conn.create_id()) """