为啥要定义抽象基类，意义何在

你想定义一个接口或抽象类，并且通过执行类型检查来确保子类实现了某些特定的方法

 

运用 abc 模块可以轻松的实现 抽象基类

Python

import abc from abc import ABCMeta,abstractmethod class Http_Base(metaclass=ABCMeta): @abstractmethod def get(self): pass @abstractmethod def set(self,key,velue): pass

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import abc from abc import ABCMeta , abstractmethod   class Http_Base ( metaclass = ABCMeta ) :      @ abstractmethod      def get ( self ) :          pass        @ abstractmethod      def set ( self , key , velue ) :          pass

抽象类的一个特点是它不能直接被实例化，比如你想像下面这样做是不行的：

Python

Http_Base() TypeError: Can't instantiate abstract class Http_Base with abstract methods get, set

1 2	Http_Base ( ) TypeError : Can' t instantiate abstract class Http_Base with abstract methods get , set

抽象类的目的就是让别的类继承它并实现特定的抽象方法：

 

Python

class Http(Http_Base): def get(self): pass def set(self,key,velue): pass

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class Http ( Http_Base ) :        def get ( self ) :          pass      def set ( self , key , velue ) :          pass

 

全部代码

Python

#需要设计一个抽象基类， 指定子类必须实现某些方法 import abc from abc import ABCMeta,abstractmethod class Http_Base(metaclass=ABCMeta): @abstractmethod def get(self): pass @abstractmethod def set(self,key,velue): pass class Http(Http_Base): def get(self): pass def set(self,key,velue): pass http = Http()

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#需要设计一个抽象基类， 指定子类必须实现某些方法   import abc from abc import ABCMeta , abstractmethod   class Http_Base ( metaclass = ABCMeta ) :      @ abstractmethod      def get ( self ) :          pass        @ abstractmethod      def set ( self , key , velue ) :          pass       class Http ( Http_Base ) :        def get ( self ) :          pass      def set ( self , key , velue ) :          pass     http = Http ( )

 

 

 

 

 

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