Re: [Python-ideas] Allow a group by operation for dict comprehension

On Jun 28, 2018, at 5:30 PM, Chris Barker - NOAA Federal chris.barker@noaa.gov wrote:

So maybe a solution is an accumulator special case of defaultdict — it uses a list be default and appends by default.

Almost like counter...

Which, of course, is pretty much what your proposal is.

Which makes me think — a new classmethod on the builtin dict is a pretty heavy lift compared to a new type of dict in the collections module.

-CHB