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Why is '+' not understood by Python sets?

...t int/long) define this operation across a sequence of boolean values and call it "bitwise or". In fact this operation is so similar to the set union that binary integers are sometimes also called "Bit sets", where the elements in the set are taken to be the natural numbers. Because int already de...
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Setting design time DataContext on a Window is giving a compiler error?

...set the design time d:DataContext below, which I can successfully do for all my various UserControls, but it gives me this error when I try to do it on the window... ...
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Switch statement fallthrough in C#?

Switch statement fallthrough is one of my personal major reasons for loving switch vs. if/else if constructs. An example is in order here: ...
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jQuery get mouse position within an element

...entOffset = $(this).parent().offset(); //or $(this).offset(); if you really just want the current element's offset var relX = e.pageX - parentOffset.left; var relY = e.pageY - parentOffset.top; }); share ...
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How to initialize a dict with keys from a list and empty value in Python?

... dict.fromkeys([1, 2, 3, 4]) This is actually a classmethod, so it works for dict-subclasses (like collections.defaultdict) as well. The optional second argument specifies the value to use for the keys (defaults to None.) ...
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REST authentication and exposing the API key

... in javascript...so if I put a flicker photo on my webpage via their API (called by javascript), and you visit my page, aren't I exposing my API key to anyone who visits my page? – tjans Mar 29 '11 at 13:38 ...
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Can scripts be inserted with innerHTML?

... that you've inserted as DOM text. MooTools will do this for you automatically, and I'm sure jQuery would as well (depending on the version. jQuery version 1.6+ uses eval). This saves a lot of hassle of parsing out <script> tags and escaping your content, as well as a bunch of other "gotchas...
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The 'json' native gem requires installed build tools

I have ruby 1.9.2p180 (2011-02-18) [i386-mingw32] installed on my windows 7 machine. Now I tried to install the JSON gem using the command, "gem install json" and got the following error. ...
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disable nganimate for some elements

I'm using the ngAnimate module, but all my ng-if , ng-show , etc, are affected by that, I want to leverage ngAnimate for some selected elements. For performance and some bugs in elements that shows and hide very speedy. ...
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Java: Clear the console

... There is no executable named cls.exe or cls.com in a standard Windows installation that could be invoked via Runtime.exec, as the well-known command cls is builtin to Windows’ command line interpreter. When launching a new process via Runtime.exec, the standard output gets redirected to a pipe wh...