python | 面向对象 | 继承

# encoding: utf-8

import abc

# ************************************************继承************************************************
# 1 继承的三种形态:
#               单继承
#               无重叠的多继承(资源访问顺序按遵循单调性)
#               有重叠的多继承

# 2 ************************************************
#  super
# 沿着MRO链条，找到下一级方法，调用对应的方法

class D:
def __init__(self):
print("d")

class C(D):
def __init__(self):
super(C, self).__init__()
print("c")

class B(D):
def __init__(self):
super(B, self).__init__()
print("b")

class A(B, C):
def __init__(self):
super(A, self).__init__()
print("a")

A()

# 3 ************************************************
# 抽象类

class Animal(metaclass=abc.ABCMeta):

@abc.abstractmethod
def call(self):
pass

@abc.abstractclassmethod
def test(cls):
pass

class Dog(Animal):
def call(self):
print("wang wang wang")

@classmethod
def test(cls):
print(cls.__dict__)

class Cat(Animal):
def call(self):
print("miao miao miao")

@classmethod
def test(cls):
print(cls.__dict__)

d = Dog()
c = Cat()

c.call()
d.call()