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What's the difference between dist-packages and site-packages?

I'm a bit miffed by the python package installation process. Specifically, what's the difference between packages installed in the dist-packages directory and the site-packages directory? ...
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Give examples of functions which demonstrate covariance and contravariance in the cases of both over

...List<? super String> contravariantList = aList; You can now access all methods of covariantList that doesn't take a generic parameter (as it must be something "extends Object"), but getters will work fine (as the returned object will always be of type "Object") The opposite is true for cont...
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Checking if form has been submitted - PHP

...for in some cases (e.g. with check boxes and button without a name). You really should use: if ($_SERVER['REQUEST_METHOD'] == 'POST') share | improve this answer | follow ...
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How to split a delimited string into an array in awk?

... 'is not working for me'. especially with colons between the echoed values and split set up to split on '|'??? Typo? Good luck to all. – shellter Nov 4 '11 at 23:17 ...
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Initializing a member array in constructor initializer

...hing. I'm not exactly sure about the following case, but some compilers do allow it. struct A { char foo[6]; A():foo("hello") { } /* valid? */ }; See this GCC PR for further details. Do C++0x initializer lists solve the problem? Yes, they do. However your syntax is invalid, I think. Y...
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Is generator.next() visible in Python 3?

...son for this is consistency: special methods like __init__() and __del__() all have double underscores (or "dunder" in the current vernacular), and .next() was one of the few exceptions to that rule. This was fixed in Python 3.0. [*] But instead of calling g.__next__(), use next(g). [*] There are ...
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Does Swift support reflection?

...s to me it's just a hack to enable debugging in Xcode. Protocol Mirror actually quotes the word IDE several times. – Sulthan Jun 6 '14 at 7:50 7 ...
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Can PostgreSQL index array columns?

... to this question in the documentation. If a column is an array type, will all the entered values be individually indexed? ...
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How to have Emacs auto-refresh all buffers when files have changed on disk?

...an my emacs buffers (en masse). Is there any way to tell emacs to refresh all the buffers from disk in one fell swoop, instead of having to do each one individually by reloading the file? ...
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resizes wrong; appears to have unremovable `min-width: min-content`

...scribed below is fixed as of Firefox 53 and the link to this answer has finally been removed from Bootstrap's documentation. Also, my sincere apologies to the Mozilla contributors who had to block removing support for -moz-document partly due to this answer. The fix In WebKit and Firefox 53+, you...