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how to concatenate two dictionaries to create a new one in Python? [duplicate]
...: concatenate the items and call dict on the resulting list:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1.items() + d2.items() + d3.items())'
100000 loops, best of 3: 4.93 usec per loop
Fastest: exploit the dict constructor to the hilt, then one update:
$ pyt...
Why do we need break after case statements?
Why doesn't the compiler automatically put break statements after each code block in the switch? Is it for historical reasons? When would you want multiple code blocks to execute?
...
jQuery get the location of an element relative to window
Given an HTML DOM ID, how to get an element's position relative to the window in JavaScript/JQuery? This is not the same as relative to the document nor offset parent since the element may be inside an iframe or some other elements. I need to get the screen location of the element's rectangle (as ...
MySQL select 10 random rows from 600K rows fast
...ql/order-by-rand/
For most general case, here is how you do it:
SELECT name
FROM random AS r1 JOIN
(SELECT CEIL(RAND() *
(SELECT MAX(id)
FROM random)) AS id)
AS r2
WHERE r1.id >= r2.id
ORDER BY r1.id ASC
LIMIT 1
This supposes th...
Xcode Find and replace in all project files
...se in all files in the current project I am working on… What is an easy method to do this? (the search navigator only has search in it).
...
How do I implement a callback in PHP?
...y value that acts like a function pointer, referencing a function or class method for future invocation. This has allowed some elements of functional programming since PHP 4. The flavors are:
$cb1 = 'someGlobalFunction';
$cb2 = ['ClassName', 'someStaticMethod'];
$cb3 = [$object, 'somePublicMethod']...
Can you determine if Chrome is in incognito mode via a script?
Is it possible to determine if Google Chrome is in incognito mode via a script?
10 Answers
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Fixed Table Cell Width
...data etc. - one example of this is the popular jqGrid. However, there is some magic happening that I cant seem to fathom (its tables for crying out loud, how much magic could there possibly be?)
...
Rebase array keys after unsetting elements
...elying on unique key values to identify the output from a form, one of the methods below works better.
– user1239087
Feb 20 '17 at 0:09
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sh...
Using Chrome's Element Inspector in Print Preview Mode?
...d to work on the print view. Typically when I have layout issues I use Chrome's Element Inspector. However this does not exist in print preview mode.
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