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Creating a singleton in Python
...s Logger(metaclass=Singleton):
pass
If you want to run __init__ every time the class is called, add
else:
cls._instances[cls].__init__(*args, **kwargs)
to the if statement in Singleton.__call__.
A few words about metaclasses. A metaclass is the class of a class; that is, a ...
Evenly distributing n points on a sphere
...Wonderful, thanks for the explanation. I'll try it out later, as I haven't time currently, but thank you so much for helping me out. I'll let you know how it ends up working for my purposes. ^^
– Befall
Mar 7 '12 at 21:06
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How can I pretty-print JSON in a shell script?
...he above cases. You can put this in .bashrc and it will be available every time in shell. Invoke it like prettyjson_s '{"foo": "lorem", "bar": "ipsum"}'.
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Binding multiple events to a listener (without JQuery)?
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In POJS, you add one listener at a time. It is not common to add the same listener for two different events on the same element. You could write your own small function to do the job, e.g.:
/* Add one or more listeners to an element
** @param {DOMElement} ele...
MongoDB Many-to-Many Association
...ractical level, the release of Couchbase 4.0 has meant that, for the first time, you can do native JOINs in NoSQL. They use their own N1QL. This is an example of a JOIN from their tutorials:
SELECT usr.personal_details, orders
FROM users_with_orders usr
USE KEYS "Elinor_333137...
Why doesn't Objective-C support private methods?
...me dynamic method resolution point as every other method dispatch. At runtime, every method implementation has the exact same exposure and all of the APIs provided by the Objective-C runtime that work with methods and selectors work equally the same across all methods.
As many have answered (both...
Using custom std::set comparator
...&)> mySet(&comparator);
which is irritating to type out every time you need a set of that type, and can cause issues if you don't create all sets with the same comparator.
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impro...
PHP Array to CSV
...hp://memory','w');
$header=array("asdf ","asdf","asd","Calasdflee","Start Time","End Time" );
fputcsv($f,$header);
fputcsv($f,$header);
fputcsv($f,$header);
fseek($f,0);
header('content-type:text/csv');
header('Content-Disposition: attachment; filename="' . $filename . '";');
fpassth...
Hand Coded GUI Versus Qt Designer GUI [closed]
...em by hand if you really wanted to) can often be dynamically loaded at run-time (Qt and GTK+ both provide this feature). This means that you can make layout changes and test them without recompiling.
Ultimately, I think both raw code and UI tools can be effective. It probably depends a lot on the ...
In log4j, does checking isDebugEnabled before logging improve performance?
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String.format is 40 times slower than concat & slf4j has limitation of 2 params See numbers here: stackoverflow.com/questions/925423/… I have seen many a profiler graph where the format operation is wasted in debug statements when the p...