python基础（16）私有类，类，类变量

1.私有类：

class My:
    def test(self):
        self.__password = 123456
    def say(self):
        print('password',self.__password)
    def __set_password(self):
        self.__password = 7890
    def update(self):
        self.__set_password()

m = My()
m.test()
m.say()
m.update()
m.say()

2.类：

class My:  #经典类
    pass

class My2(object):  #新式类
    pass

class My3(): #新式类
    pass

country = 'China'

class Person:
    def __init__(self,name):
        print('开始了',name)
        self.name = name  # 实例变量
        self.age = 18
        # 人的名字是 马小
        self.data = '哈哈哈'
        self.addr = '南京'

    def cry(self,size):
        print('%s在%s哭。年龄是%s'%(size,self.name,self.age))
        self.size = '大哭'
        self.date = '20190106'
    def say(self):
        print('我叫%s，我住在%s.'%(self.name,self.addr))
        print(self.size)
        print('Jin天的日期',self.date)
        self.help()
    def help(self):
        print(self.date)
mcb = Person('马小')
cq = Person('陈大')
mcb.grilfriend = cq #
print('马小的女朋友',mcb.grilfriend.name)
mcb.grilfriend.cry('大')
# mcb = Person('马小')
# mcb.addr = '北京'
# mcb.cry('大')  #cry(mcb,大)
# mcb.say()
#
# def car(self,car_name): #
#     self.car_name = car_name
#     #函数里面给mcb加了一个变量
#
# car(mcb,'奔驰')#把mcb这个实例传给了self，self指的就是mcb这个实例
#
# print(mcb.car_name)

# cq = Person('陈大')
# cq.cry('大') #cry(cq,大)
# print('cq....name',cq.name)
# print('cq....name',cq.age)

# print('mcb的内存地址',id(mcb))
# print('mcb....name',mcb.name)
# print('mcb....age',mcb.age)
# print(mcb.data)

# def abc(self,name):
#     print(self)
#     print(name)
# abc(111,'马小')

3.类变量

class Car:
    wheel = 4 #类变量
    def __init__(self,color,p):
        self.color = color #实例变量
        self.p = p

    def help(self):
        print('汽车有%s个轮子'%self.wheel)
        print('汽车的颜色是%s'%self.color)
        print('牌子%s'%self.p)
        print('='*10)
        self.haha()
        self.check_wheel()

    @classmethod
    def check_wheel(cls):
        print('cls的内存地址',id(cls))
        print(cls.wheel)
        cls.haha()

    @classmethod
    def haha(cls):
        print('哈哈哈')
        cls.help2()

    @staticmethod
    def help2():
        print('这个类的作用是造汽车，它里面有xxx方法')

    @property
    def yesterday(self):
        import datetime
        res = datetime.date.today()  + datetime.timedelta(-1)
        return str(res)

    def tom(self):
        import datetime
        res = datetime.date.today()  + datetime.timedelta(1)
        return str(res)

Car.help2()
mcb = Car('赤橙黄绿青蓝紫','马春波')
print(mcb.yesterday)

print(mcb.tom())

# mcb.wheel = 28
# mcb.haha()
# mcb.help()
# mcb.help2()
#

# print('Car的内存地址',id(Car))
# Car.check_wheel()



# Car.wheel= 19
# print(Car.wheel)

#
# benc = Car('黑色','奔驰')
# benc.help()
#
# bmw = Car('白色','宝马')
# bmw.help()