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Generator Expressions vs. List Comprehension
... A generator deletes items from memory after their iterated over. So its fast if you have big data you just want to display it, for example. Its not a memory hog. with generators items are processed 'as needed'. if you want to hang on to the list or iterate over it again (so store the items) then...
Android buildscript repositories: jcenter VS mavencentral
... artifacts.
In different scenarios and from different countries Bintray is faster than Maven Central (e.g. from Israel). In others it is very close. Since Maven Central and Bintray use different CDNs which adaptively favor regions, this might change to both ways.
Bintray has a different approach to ...
Using PHP with Socket.io
...orkerman is an asynchronous event driven PHP framework for easily building fast, scalable network applications. (I just copied and pasted that from their website hahahah http://www.workerman.net/en/)
The easy way to explain this is that when it comes web socket programming all you really need to ha...
What's the best way to check if a file exists in C?
... And yes, some systems are poorly implemented. Access will be at least as fast as stat in every case and may be faster some of the time.
– Kevin
Apr 1 '16 at 15:17
add a comm...
Is there a cross-browser onload event when clicking the back button?
...
Any ideas on how to use jQuery AND get fast bfcache support?
– Alex Black
Nov 22 '10 at 19:15
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show 6 m...
postgresql - add boolean column to table set default
...big this can take a long time and lock the table for the entire time. It's faster to split it into steps: add the column without a default with ALTER TABLE users ADD COLUMN priv_user BOOLEAN;, then UPDATE users SET priv_user = 'f'; and finally if you need to ALTER TABLE users ALTER COLUMN priv_user ...
Take the content of a list and append it to another list
...
Take a look at itertools.chain for a fast way to treat many small lists as a single big list (or at least as a single big iterable) without copying the smaller lists:
>>> import itertools
>>> p = ['a', 'b', 'c']
>>> q = ['d', 'e', 'f'...
How can you profile a Python script?
...er coding contests often have a maximum time to run or people boast of how fast their particular solution runs. With Python, sometimes the approaches are somewhat kludgey - i.e., adding timing code to __main__ .
...
How to find a min/max with Ruby
...ods available.
v2.4 introduces own Array#min and Array#max, which are way faster than Enumerable's methods because they skip calling #each.
@nicholasklick mentions another option, Enumerable#minmax, but this time returning an array of [min, max].
[4, 5, 7, 10].minmax
=> [4, 10]
...
How to clone ArrayList and also clone its contents?
...
@SaurabhJinturkar: Also, the collect operation is fast. It does pretty much the same thing as your version does, but also work for parallel streams. You could fix your version by using, for example, a concurrent queue instead of an array list, but I'm almost certain that wou...