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PostgreSQL return result set as JSON array?
...
TL;DR
SELECT json_agg(t) FROM t
for a JSON array of objects, and
SELECT
json_build_object(
'a', json_agg(t.a),
'b', json_agg(t.b)
)
FROM t
for a JSON object of arrays.
List of objects
This section describes how to generate a JSON array of objects, with eac...
What is the difference between git am and git apply?
Both git am and git apply can be used to apply patches. I fail to see the difference. I see a difference now: git am automatically commits whereas git apply only touches the files but doesn't create a commit. Is that the only difference?
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Android REST client, Sample?
...reason to use anything else.
EDIT:
The original answer is more than a year and a half old at the time of this edit. Although the concepts presented in original answer still hold, as other answers point out, there are now libraries out there that make this task easier for you. More importantly, some ...
Check whether a string is not null and not empty
How can I check whether a string is not null and not empty?
31 Answers
31
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Secondary axis with twinx(): how to add to legend?
... a plot with two y-axes, using twinx() . I also give labels to the lines, and want to show them with legend() , but I only succeed to get the labels of one axis in the legend:
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Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?
...ity between systems with different screen resolution.)
Some (incomplete, and unfortunately the links are broken due to migration of SwingLabs to java.net) technical reasons are for instance mentioned in the Rules (hehe) or in the link @bendicott found in his/her comment to my answer. Socially, pos...
What is the good python3 equivalent for auto tuple unpacking in lambda?
...just to unfold the parameters - but that would be at once more inefficient and harder to read than your two suggestions:
min(points, key=lambda p: (lambda x,y: (x*x + y*y))(*p))
update Python 3.8
As of now, Python 3.8 alpha1 is available, and PEP 572- assignment expressions are implemented.
So,...
input type=“text” vs input type=“search” in HTML5
...m working with form input fields, especially <input type="text" /> and <input type="search" /> IMO there wasn't any difference in all major browser including Safari, Chrome, Firefox and Opera. And the search field also behaves like a regular text field.
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Argparse: Required argument 'y' if 'x' is present
...ts of options.
The simplest way to deal with this would be:
if args.prox and (args.lport is None or args.rport is None):
parser.error("--prox requires --lport and --rport.")
share
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improve t...
django - why is the request.POST object immutable?
...nts a full set of mutation methods including __setitem__, __delitem__, pop and clear. It implements immutability by checking a flag when you call one of the mutation methods. And when you call the copy method you get another QueryDict instance with the mutable flag turned on.
For performance improve...