[Python-Dev] Proposal: defaultdict

[Georg Brandl]

Thomas Heller wrote:

>> Probably a good idea, has been proposed multiple times on clpy.
>> One good thing would be to be able to specify either a default value
>> or a factory function.
>> 
>> While at it, other interesting dict subclasses could be:
>> * sorteddict, practically reinvented by every larger project
> 
> You mean ordereddict, not sorteddict, I hope.

Well, yes.

>> * keytransformdict, such as d = keytransformdict(str.lower).
> 
> Not sure what you mean by that.
> 
> What *I* would like is probably more ambitious:  I want a dict that allows case-insensitive
> lookup of string keys

This is exactly what this would do. All keys are transformed to lowercase when
setting and looking up.

> plus ideally I want to use it as class or instance dictionary.
> Use case: COM wrappers.

regards,
Georg