[Python-ideas] grouping / dict of lists

[Michel Desmoulin]

Counter also consider any missing key has the value "0".

With the constructor (accepting any iterable) and the most_common(n),
it's just a very set of features if you need to count anything.

Le 13/07/2018 à 19:45, Michael Selik a écrit :
> On Mon, Jul 2, 2018 at 8:49 AM Chris Barker <chris.barker at noaa.gov
> <mailto:chris.barker at noaa.gov>> wrote:
> 
>     On Fri, Jun 29, 2018 at 11:25 PM, Guido van Rossum <guido at python.org
>     <mailto:guido at python.org>> wrote:
>      
> 
>         Hm, this actually feels heavier to me. But then again I never
>         liked or understood the need for Counter --
> 
> 
>     actually, me neither -- and partly because it's too lightweight --
>     that is, it's still a regular dict, and you pretty much have to know
>     that to use it. That it, it provides a nice counting constructor,
>     but after that, it's just a key:integer dict :-)
> 
> 
> Counter provides ``most_common`` which is often implemented
> inefficiently if written from scratch. People mistakenly use ``sorted``
> instead of ``heapq.nlargest``.
> 
> 
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