On 2019-10-07 20:35, Steven D'Aprano wrote:
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.
For Pandas, db['x'] which creates an expression involving `x`, and can
be used in more than one place. It is small matter to start your method
(or class, or module) with some declarations:
x = db['x']
which is boilerplate, but also easily ignored. Then you can write
db[x==1]
Which is just as clean, and more specific, than whatever `db[x=1]`
means. I do not believe this syntax will help Pandas because equality
is just one-of-many useful operators. This does not help me if I want
to say
db[x>1]
or say
db[x==1 || t > 2]
I am not sure how many expressions are actually found in realworld
code. Examples are written out, but most code is not examples. Most
code, that I have seen, manipulates expressions that come from
elsewhere. Here is an Elasticsearch expression:
e = {"term": {"x": 1}}
which is not seen in the code; assignment to `e` is done elsewhere,
maybe from a config file, maybe from another application. The code only
sees `e`. Therefore an example like
db[db['x'] == 1]
looks like
db[e]
in realworld code.
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-le...@python.org
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/python-ideas@python.org/message/36SKB65DI64CUTS277ICCUDDKXZSZJTG/
Code of Conduct: http://python.org/psf/codeofconduct/
