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Python list subtraction operation
... if item not in yset] which abuses nested listcomps to cache the yset as a one-liner. A slightly less ugly one-liner solution that performs adequately would be to use list(itertools.filterfalse(set(y).__contains__, x)) because the argument to filterfalse is only constructed once.
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How to 'insert if not exists' in MySQL?
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Just to inform everyone. Using INSERT … ON DUPLICATE KEY UPDATE method does increment any AUTO_INCREMENT column with failed insert. Probably because it's not really failed, but UPDATE'd.
– not2qubit
Oct 2...
Environment variables in Mac OS X
...have a complete answer . Having to set the path or variable in two places (one for GUI and one for shell) is lame.
9 Answer...
Run php script as daemon process
...is for years now. There might be better solution, but this is the quickest one.
– CDR
Jan 15 '10 at 8:07
28
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How do I create a unique constraint that also allows nulls?
...able won't let me store NULLs in a unique column in the first place. If anyone knows a solution for that, please post it here
– dotNET
Feb 2 '15 at 22:01
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When should I use h:outputLink instead of h:commandLink?
...ty of the target page when the link is actually clicked (the URL won't be "one behind" anymore), but it doesn't change the href of the <a> element to be a fullworthy URL. It still remains #.
<h:form>
<h:commandLink value="link text" action="destination?faces-redirect=true" />
&...
When to use nested classes and classes nested in modules?
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I have no idea how this answer got 60 upvotes, let alone did get accepted by the OP. There is literally not a single true statement in here. Ruby doesn't have nested classes like Beta or Newspeak do. There is absolutely no relation whatsoever between Car and Car::Wheel. Modules...
jQuery autocomplete tagging plug-in like StackOverflow's input tags? [closed]
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Anyone looking for the most up to date version, documentation and more extensive examples of this amazing plugin should go here and fork away: github.com/aehlke/tag-it
– Crisman
Feb 21 '12 ...
Understanding Python's “is” operator
...ultiple names point to the same object. is tells you if two names point to one and the same object. == tells you if two names refer to objects that have the same value.
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About Android image and asset sizes
...$folder/. -type f -name "*[A-Z]*"); do mv "$i" "$(echo $i | tr A-Z a-z)"; done
mkdir drawable-ldpi
mkdir drawable-mdpi
mkdir drawable-tvdpi
mkdir drawable-hdpi
mkdir drawable-xhdpi
mkdir drawable-xxhdpi
mkdir drawable-xxxhdpi
cp $folder/* drawable-ldpi/
cp $folder/* drawable-mdpi/
cp $folder/* dra...