day6-class继承

Part1---单个父类class继承

class people:
    def __init__(self,name,age):
        self.name=name
        self.age=age

    def eat(self):
        print('%s is eating...'%self.name)
    def talking(self):
        print('%s is talking...'%self.name)
    def sleeping(self):
        print('%s is sleeping under class people...'%self.name)


class man(people):     #一个class直接调用了另一个已有的class,就像是函数嵌套，只不过这里是内嵌class(继承)
    #pass              part1,啥都不写,后面直接m1.eat()

    def __init__(self,name,age,money):        #part3
        #people.__init__(self,name,age)       #方法1经典写法,调用父位people中的name,age
        super(man,self).__init__(name,age)    #方法2新式写法,用super,内建的方法,格式:super(自己class名,self).__init__(父位中的形参)
                                              #好处1:当父位class的名字更改后不会影响到这里,因为这里不需要写父位名
                                              #好处2:一个class可以继承多个父位,如果用上面的方法则要写多个父位.__init__()
        self.muchmoney=money                  #这里只用写自己多出来的形参

    def USD(self):                            #part3
        print('%s has much %s money!!!' % (self.name, self.muchmoney))

    def shout(self):             #part2 当然还可以在自己的class下面定义自己的方法
        print('%s is shouting...'%self.name)
    def sleeping(self):          #part2 c1, 重写，定义跟继承class中同样名字的函数方法  自己的会精细，override
        people.sleeping(self)    #part2 c2, 重构, 如果还想保留继承class中的东西，但又添加自己的，这里引用继承class中的函数方法
        print('%s is sleeping under class man...'%self.name)


class women(people):       #part2
    def birth(self):
        print('%s is born baby...'%self.name)


#m1=man('alex',22)
# m1.eat()          #part1, #alex is eating...
# m1.shout()        #part1, #alex is shouting...
# #m1.sleeping()    #part2 c1, alex is sleeping under class man...
# m1.sleeping()     #part2 c2,
# # alex is sleeping under class people...
# # alex is sleeping under class man...
#
# w1=women('alley',20)
# w1.birth()    #alley is born baby...
# #w1.shout()    #man和women同属于父class people,子class之间无法互相调用函数方法, 但可以连起来(参见下继承-2.py中的例子)
# #AttributeError: 'women' object has no attribute 'shout'


m1=man('alex',22,'10w')
m1.USD()    #alex has much 10w money!!!

 

Part2---多个父类class继承

#class多父位继承,以下例子中class man/women继承了2个父位:people和couple

class people:
    def __init__(self,name):
        self.abc=name
        self.fridends=[]

class couple(object):         #理解成(object)=__init__(self)
    def marry(self,obj):
        print('%s and %s are couple' %(self.abc,obj.abc))
        #这里调用了class people中的self.abc,又加了个obj.abc. 注意这里的abc必须跟class people中的abc名字一样
        #那abc究竟指啥呢? 由于m1.marry(w1)中的w1会赋值给第二个%s,但前提是couple这个class中没有定义
        #自己的构造函数,也就是没def __init__(self), 如果ojb.xxx=class people中的self.xxx=name='w1=women('alley')'的话,
        #那就相当于将alley赋值给abc了

        #下面的例子更改成obj.xxxxx,但不更改class people中的self.abc,结果会是在women object中找不到xxxxx这个静态属性
        #print('%s and %s are couple' %(self.abc,obj.xxxxx))
        #AttributeError: 'women' object has no attribute 'xxxxx'

        #self.fridends.append(obj)          #print-1
        self.fridends.append(obj.abc)       #print-2,打印obj中的abc,结果是alley

#class man(people,couple):
class man(couple,people):   #位置不会有影响,couple里面找不到
    pass

#class women(people,couple):
class women(couple, people):
    pass


m1=man('alex')
w1=women('alley')
m1.marry(w1)

#m1.marry('afafaf')
#   File "C:/x-working/pycharm/project-14/Day6/继承-2.py", line 10, in marry
#     print('%s and %s are couple' %(self.abc,obj.abc))
# AttributeError: 'str' object has no attribute 'abc'

#print(m1.fridends[0])            #print-1
#<__main__.women object at 0x0000000002939D68>

print(m1.fridends[0])             #print-2
#alley