[Python-Dev] [NPERS] Re: a feature i'd like to see in python #2: indexing of match objects
Ben Wing
ben at 666.com
Tue Dec 5 10:02:39 CET 2006
Fredrik Lundh wrote:
> Ka-Ping Yee wrote:
>
>
>> I'd say, don't pretend m is a sequence. Pretend it's a mapping.
>> Then the conceptual issues go away.
>>
>
> almost; that would mean returning KeyError instead of IndexError for
> groups that don't exist, which means that the common pattern
>
> a, b, c = m.groups()
>
> cannot be rewritten as
>
> _, a, b, c = m
>
> which would, perhaps, be a bit unfortunate.
>
> taking everything into account, I think we should simply map __getitem__
> to group, and stop there. no len(), no slicing, no sequence or mapping
> semantics. if people want full sequence behaviour with len and slicing
> and iterators and whatnot, they can do list(m) first.
>
>
i'm ok either way -- that is, either with the proposal i previously
published, or with this restricted idea.
ben
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