python super用法及原理详解_Python

python super用法及原理详解

2020-04-10 13:38虚生 Python

这篇文章主要介绍了python super用法及原理详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

概念

super作为python的内建函数。主要作用如下：

允许我们避免使用基类
跟随多重继承来使用

实例

在单个继承的场景下，一般使用super来调用基类来实现：
下面是一个例子：

				?

									class Mammal(object):

									 def __init__(self, mammalName):

									  print(mammalName, 'is a warm-blooded animal.')

									class Dog(Mammal):

									 def __init__(self):

									  print('Dog has four legs.')

									  super().__init__('Dog')

									d1 = Dog()

输出结果：

➜ super git:(master) ✗ py super_script.py

Dog has four legs.

Dog is a warm-blooded animal.

super在多重继承里面的使用：

下面是一个例子：

				?

									class Animal:

									 def __init__(self, animalName):

									  print(animalName, 'is an animal.');

									class Mammal(Animal):

									 def __init__(self, mammalName):

									  print(mammalName, 'is a warm-blooded animal.')

									  super().__init__(mammalName)

									class NonWingedMammal(Mammal):

									 def __init__(self, NonWingedMammalName):

									  print(NonWingedMammalName, "can't fly.")

									  super().__init__(NonWingedMammalName)

									class NonMarineMammal(Mammal):

									 def __init__(self, NonMarineMammalName):

									  print(NonMarineMammalName, "can't swim.")

									  super().__init__(NonMarineMammalName)

									class Dog(NonMarineMammal, NonWingedMammal):

									 def __init__(self):

									  print('Dog has 4 legs.');

									  super().__init__('Dog')

									d = Dog()

									print('')

									bat = NonMarineMammal('Bat')

输出结果：

				?

									➜ super git:(master) ✗ py super_muli.py

									Dog has 4 legs.

									Dog can't swim.

									Dog can't fly.

									Dog is a warm-blooded animal.

									Dog is an animal.

									Bat can't swim.

									Bat is a warm-blooded animal.

									Bat is an animal.