On 10/09/2013 22:46, Antoine Pitrou wrote:
On Tue, 10 Sep 2013 18:44:20 -0300
"Joao S. O. Bueno" <jsbu...@python.org.br> wrote:
On 10 September 2013 18:06, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Tue, 10 Sep 2013 17:38:26 -0300
> "Joao S. O. Bueno" <jsbu...@python.org.br> wrote:
>> On 10 September 2013 16:08, Paul Moore <p.f.mo...@gmail.com> wrote:
>> > If you provide "retain the last", I can't see any obvious way of
>> > implementing "retain the first" in application code without in effect
>> > reimplementing the class.
>>
>> Which reminds one - this class should obviously have a method for
>> retrivieng the original key value, given a matching key -
>>
>> d.canonical('foo') -> 'Foo'
>
> I don't know. Is there any use case?
> (sure, it is trivially implemented)
Well, I'd expect it to simply be there. I had not thought of
other usecases for the transformdict itself -
I had the same thought.
Well, it is not here for dict, set, etc.
In those cases the key in the dict == the key you're looking for.
For example, in latim languages it is common to want
accented letters to match their unaccented counterparts
- pick my own first name "João" - if I'd use a transform to strip
the diactriticals, and have an user input "joao" - it would match,
as intended - but I would not be able to retrieve the accented version
without re-implementing the class behavior.
Interesting example, thanks.
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