[Python-Dev] Mini-Pep: An Empty String ABC

[Guido van Rossum]

Please try to find the largest set of methods that you're comfortable
with. __add__ comes to mind.

Note that if you add __hash__, this rules out bytearray -- is that
your intention? __hash__ is intentionally not part of the "read-only"
ABCs because read-only doesn't mean immutable.

Also, (again) please list which built-in types you want to register.

On Mon, Jun 2, 2008 at 1:54 PM, Raymond Hettinger <python at rcn.com> wrote:
> From: "Guido van Rossum" <guido at python.org>
>>
>> All this makes me lean towards a rejection of this proposal -- it
>> seems worse than no proposal at all. It could perhaps be rescued by
>> adding some small set of defined operations.
>
> By subclassing Sequence, we get index() and count() mixins for free.
>
> We can also add other mixin freebies like __hash__(), __eq__(), __ne__(),
> endswith(), startswith(), find(), rfind(), and rindex().
>
> It's tempting to add center, lust, rjust, and zfill, but those require some
> sort of constructor that accepts an iterable argument.
>
> As important as what is included are the methods intentionally left out.
> I'm trying to avoid insisting on abstractmethods like encode(), split(),
> join(), and other methods that place an undue burden on a class being
> registered as a String.
>
>
> Raymond
>
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)