[Python-ideas] Accepting multiple mappings as positional arguments to create dicts
python-ideas at mgmiller.net
Sun Apr 15 17:13:59 EDT 2018
On 2018-04-12 18:03, Guido van Rossum wrote:
> It's a slippery slope indeed. While having to change update() alone wouldn't
> worry me, the subclass constructors do seem like they are going to want changing
> too, and that's indeed a bit much. So let's back off a bit. Not every three
> lines of code need a built-in shorthand.
This is disappointing since the dictionary is one of the most used but
simultaneously limited of the builtin types. It doesn't support a lot of
operations that strings, lists, tuples, sets, etc do. These are the little
niceties that make Python fun to program in. But, for some reason we're stingy
when it comes to dictionaries, the foundation of the language.
Has anyone disagreed the dict constructor shouldn't take multiple arguments?
Also, it isn't always three lines of code, but expands with the number that need
to be merged.
My guess is that the dict is used an order of magnitude more than specialized
subclasses, even more so now that the Ordered variant is unnecessary in newer
versions. It wouldn't bother me at all if it took a few years for the
improvement to get rolled out to subclasses or never, it's quite a minor
disappointment compared to getting the functionality ~90% of the time.
Also wouldn't mind helping out with the subclasses if there is some lifting that
needed to be done.
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