[Python-Dev] PEP 455: TransformDict (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Sat Sep 14 12:30:46 CEST 2013

On Sat, 14 Sep 2013 14:33:56 +0900 Larry Hastings <larry at hastings.org> wrote:

On 09/14/2013 03:40 AM, Antoine Pitrou wrote: > Hello, > > Following the python-dev discussion, I've written a PEP to recap the > proposal and the various arguments. It's inlined below, and it will > probably appear soon at http://www.python.org/dev/peps/pep-0455/, too.

Whenever I read a discussion about the dict, I always wonder whether the same thing applies to a set. Have you considered the utility of a TransformSet? Or is it YAGNI?

Well, a TransformSet is like a normal dict, you just need to call the transformation function yourself when inserting the keys. i.e.:

d = TransformSet(str.lower) d.add('Foo')

is the same conceptually as:

d = {} d['Foo'.lower()] = 'Foo' d['foo'] # gets the original key

Regards

Antoine.

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