It's really not a worthwhile win. It captures a tiny fraction of Pandas
style filtering while complicating the syntax of Python. Here's another
Pandas filter:
db[db.x < 1]
No help there with the next syntax. Here's another:
db[(db.x == 1) | (db.y == 2)]
A much better idea doesn't require any changes in Python, just a clever
class method. Pandas did this for a while, but deprecated it because...
reasons. Still, the OP is free to create his version:
db['x=1']
Or
db['x<1']
db['x=1 or y=2']
You can bikeshed the spelling of those predicates, but it doesn't matter,
they are just strings that you can see however you decide is best.
On Mon, Oct 7, 2019, 8:38 PM Steven D'Aprano <st...@pearwood.info> wrote:
> On Tue, Oct 08, 2019 at 09:19:07AM +1100, Cameron Simpson wrote:
> > On 07Oct2019 10:56, Joao S. O. Bueno <jsbu...@python.org.br> wrote:
> > >So, in short, your idea is to allow "=" signs inside `[]` get notation
> to
> > >be translated
> > >to dicts on the call,
> >
> > Subjectively that seems like a tiny tiny win. I'm quite -1 on this idea;
> > language spec bloat to neglible gain.
>
> As per Caleb's initial post, this is how Pandas currently does it:
>
> db[db['x'] == 1]
>
> Replacing that with db[x=1] seems like a HUGE win to me.
>
> Even db[{'x': 1}] is pretty clunky.
>
>
>
> --
> Steven
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