new-style class or old-style class?

[Mark Lawrence]

On 25/09/2012 17:20, Steven D'Aprano wrote:
> 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.
>
>
>

Thanks for this reminder, my port of the J word code to Python has just 
been simplified :)

-- 
Cheers.

Mark Lawrence.