Python编程中类与类的关系详解

            
# 依赖关系: 将一个类的类名或者对象传给另一个类的方法中.
class Elephant:
  def __init__(self, name):
    self.name = name
  def open(self,r1):
    # print(ref1)
    print(f'{self.name}默念三声: 芝麻开门')
    r1.open_door()
  def close(self):
    print('大象默念三声:芝麻关门')
class Refrigerator:
  def __init__(self, name):
    self.name = name
  def open_door(self):
    print(f'{self.name}冰箱门被打开了....')
  def close_door(self):
    print('冰箱门被关上了....')
e1=Elephant('大象')
r1=Refrigerator('海尔冰箱') 
e1.open(r1)   #将一个类的类名或者对象传给另一个类的方法中.产生了依赖关系
          

            
class Boy:
  def __init__(self, name):
    self.name = name
  def meet(self, girl_friend=None):
    self.girl_friend = girl_friend # wu对象空间 : girl_friend : object对象
  def have_diner(self): # self = wu这个对象空间
    if self.girl_friend:
      print(f'{self.name}请年龄为:{self.girl_friend.age},姓名为{self.girl_friend.name}一起吃六块钱的麻辣烫')
      self.girl_friend.shopping(self) # (self = wu对象空间)
    else:
      print('单身狗,吃什么吃')
class Girl:
  def __init__(self, name, age):
    self.name = name
    self.age = age
  def shopping(self,boy_friend):
    print(f'{boy_friend.name},{self.name}一起去购物!')
wu = Boy('吴超')
flower = Girl('如花', 48)
# 组合: 将一个类的对象封装成另一个类的对象的属性.
wu.meet(flower)
wu.have_diner()
          

            
class Aniaml(object):
  type_name = '动物类'

  def __init__(self,name,sex,age):
      self.name = name
      self.age = age
      self.sex = sex

  def eat(self):
    print(self)
    print('吃东西')
class Person(Aniaml):
  pass
P1=Person('alex','男','18')
# 实例化对象时必须执行__init__方法,类中没有，从父类找，父类没有，从object类中找
P1.eat()
# 先要执行自己类中的eat方法，自己类没有才能执行父类中的方法。
          

            
class Aniaml(object):
  type_name = '动物类'
  def __init__(self,name,sex,age):
      self.name = name
      self.age = age
      self.sex = sex

  def eat(self):
    print('吃东西')

class Person(Aniaml):
  def __init__(self,name,sex,age,mind):
    super().__init__(name,sex,age) # super.__init__ 自动帮你把self 传给父类的__init__
    self.mind = mind

  def eat(self):
    super().eat()
    print('%s 吃饭'%self.name)
 
    
p1 = Person('春哥','laddboy',18,'有思想')
          

            
class A:
  pass
class B(A):
  pass
class C(A):
  pass
class D(B, C):
  pass
class E:
  pass
class F(D, E):
  pass
class G(F, D):
  pass
class H:
  pass
class Foo(H, G):
  pass
          

            
mro(Child(Base1，Base2)) = [ Child ] + merge( mro(Base1), mro(Base2), [ Base1, Base2] )（其中Child继承自Base1, Base2）
          

            
mro( B ) = mro( B(A) )
= [B] + merge( mro(A) + [A] )
= [B] + merge( [A] + [A] )
= [B,A]
          

            
mro(B) = mro( B(A1, A2, A3 …) )
= [B] + merge( mro(A1), mro(A2), mro(A3) ..., [A1, A2, A3] )
= ...