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How can I get the concatenation of two lists in Python without modifying either one? [duplicate]
...s: list1 + list2. This gives a new list that is the concatenation of list1 and list2.
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How is Racket different from Scheme?
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Racket is ultimately based on R5RS, and not R6RS and not a strict superset of either. I don't think it can be called 'Scheme' because it's not backwards compatible with any Scheme standard.
Most implementations offer extensions, but are otherwise backwards com...
How can I echo a newline in a batch file?
... The period thing in "echo." never stops amazing me. It's so dated, and still I always forget that the dot must be strictly concatenated with the command name, with no spaces between. There's no error in the post of yours, I'm writing this just as a reminder: "echo ." != "echo." !
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numpy: most efficient frequency counts for unique values in an array
...p.array([1,1,1,2,2,2,5,25,1,1])
y = np.bincount(x)
ii = np.nonzero(y)[0]
And then:
zip(ii,y[ii])
# [(1, 5), (2, 3), (5, 1), (25, 1)]
or:
np.vstack((ii,y[ii])).T
# array([[ 1, 5],
[ 2, 3],
[ 5, 1],
[25, 1]])
or however you want to combine the counts and the uni...
C++ IDE for Macs [closed]
I teach a C++ course using Visual Studio. One of my students has a Mac and was looking for an IDE to use on his machine. What would be good to recommend?
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Python's equivalent of && (logical-and) in an if-statement
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You would want and instead of &&.
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How to randomize (shuffle) a JavaScript array?
...github.com/coolaj86/knuth-shuffle
You can see a great visualization here (and the original post linked to this)
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
//...
OS X: equivalent of Linux's wget
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Also, wget is available via both MacPorts and Fink.
– Brian Clapper
Dec 31 '10 at 20:26
47
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How to prevent ENTER keypress to submit a web form?
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[revision 2012, no inline handler, preserve textarea enter handling]
function checkEnter(e){
e = e || event;
var txtArea = /textarea/i.test((e.target || e.srcElement).tagName);
return txtArea || (e.keyCode || e.which || e.charCode || 0) !== 13;
}
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How do I download a tarball from GitHub using cURL?
...ertificates problems on raw.github.com? I had problems to install homebrew and rvm on a new machine. I used to copy and paste from the homepage and was working. Now I get the certificate problem: ruby -e "$(curl -fsSL raw.github.com/mxcl/homebrew/go)" curl: (60) SSL certificate problem: unable to...