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从python 3.x中的父类继承

[英]Inheriting from a parent class in python 3.x

原文 2013-06-24 09:31:35 3 2 python/ python-3.x

当您从python 3.x中的父类继承时，父类是否将其默认值“清空”，是否需要重新定义它们？

2 个解决方案

Software should try to be consistent. 软件应尽量保持一致。 So if you split a class into methods and fields, they should still behave similarly. 因此，如果将类划分为方法和字段，它们的行为仍应相似。 For methods, you expect to inherit them from your parent without any modifications unless you can see such a modification in the child. 对于方法，除非您在子级中看到这样的修改，否则您希望从其父级继承它们而无需进行任何修改。

For symmetry, fields behave the same: Unless you overwrite them in the child, you will get what the parent defines. 对于对称性，字段的行为相同：除非您在子级中覆盖它们，否则您将获得父级定义的内容。

From a more practical perspective, computers are always too slow. 从更实际的角度来看，计算机总是太慢。 So software tries to avoid unnecessary work. 因此，软件试图避免不必要的工作。 When you inherit from a parent, as little as possible is changed. 当您从父母那里继承时，尽可能少的更改。

This article gives a lot of insight how inheritance works in Python. 本文提供了很多关于继承如何在Python中工作的见解。

Any methods not overridden in the child are looked for in the parents. 在父母中寻找任何未在孩子中超越的方法。 This includes the initializer, __init__() . 这包括初始化器__init__() 。 If you do not define this in the child then the parent's method is called, initializing the object as it would an instance of the parent. 如果未在子级中定义此对象，则将调用父级的方法，并像父级实例一样初始化对象。