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Message from discussion new-style class or old-style class?
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Steven D'Aprano  
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 More options Sep 25 2012, 12:20 pm
Newsgroups: comp.lang.python
From: Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info>
Date: 25 Sep 2012 16:20:44 GMT
Local: Tues, Sep 25 2012 12:20 pm
Subject: Re: new-style class or old-style class?
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On Tue, 25 Sep 2012 07:44:04 -0700, Jayden wrote:
> In learning Python, I found there are two types of classes? Which one
> are widely used in new Python code?

New-style classes.

> Is the new-style much better than old-style?

Yes.

Always use new-style classes, unless you have some specific reason for
needing old-style ("classic") classes.

Advantages of new-style classes:

1) They are the future. In Python 3, all classes are "new-style" and
classic classes are gone.

2) Multiple inheritance works correctly. Multiple inheritance for classic
classes is buggy.

3) New-style classes support awesome features like super(), properties,
descriptors, and __getattribute__. Old-style do not.

The main disadvantage is that automatic delegation is a pain to do
correctly in new-style classes, but trivially simple in classic classes.
Still, all things considered, it's a good trade.

--
Steven


 
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