python：继承或组成

问题描述

假设我有类，它使用 dict 的一些功能。我曾经将一个 dict 对象复合在一起，并从外部提供一些访问权限，但最近考虑到只是继承 dict 添加一些我可能需要的属性和方法。这是一个很好的方法，还是应该坚持撰写？

解决方案

继承经常被滥用。除非你的班级意图被用作具有额外功能的通用字典，否则我会说组合是要走的路。

保存转接通话通常不够好选择继承的原因。

从设计模式书中：

整个文字在这里：

Let's say that I have class, that uses some functionality of dict. I used to composite a dict object inside and provide some access from the outside, but recently thought about simply inheriting dict and adding some attributes and methods that I might require. Is it a good way to go, or should I stick to composition?

解决方案

Inheritance is very often abused. Unless your class is meant to be used as a generic dictionary with extra functionality, I would say composition is the way to go.

Saving forwarding calls is usually not a good enough reason for choosing inheritance.

From the Design Pattern book:

The entire text is here:http://blog.platinumsolutions.com/node/129

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