[Python-Dev] Proposal: defaultdict (original) (raw)

Thomas Heller theller at python.net
Fri Feb 17 10:42:40 CET 2006

Guido van Rossum wrote:

d = DefaultDict([])

can be written as simply d[key].append(value) Feedback?

Ok, setdefault is a horrible name. Would it make sense to come up with a better name?

Georg Brandl 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.

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

Thomas

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