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How do I calculate square root in Python?
...valuate to 0.
And for the record, the preferred way to calculate a square root is this:
import math
math.sqrt(x)
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Using scp to copy a file to Amazon EC2 instance?
...'t know if you're joking or not... but :/ would try copy the folder to the root of the system, which would give permission errors on all machines without running sudo (or as root).
– Dobz
Jul 29 '14 at 15:17
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Python os.path.join on Windows
...join('c:', os.sep, 'sourcedir')
Since you also need os.sep for the posix root path:
mypath = os.path.join(os.sep, 'usr', 'lib')
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What is the difference between require and require-dev sections in composer.json?
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According to composer's manual:
require-dev (root-only)
Lists packages required for developing this package, or running tests, etc. The dev requirements of the root package are installed by default. Both install or update support the --no-dev option that prevents d...
Hidden features of HTML
...ost people I speak to don't tend to realise that it exists.
Example:
<select>
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
<opt...
NPM global install “cannot find module”
...lem due to my npm installing into a location that's not on my NODE_PATH.
[root@uberneek ~]# which npm
/opt/bin/npm
[root@uberneek ~]# which node
/opt/bin/node
[root@uberneek ~]# echo $NODE_PATH
My NODE_PATH was empty, and running npm install --global --verbose promised-io showed that it was insta...
Default background color of SVG root element
...podi:namedview
pagecolor="#480000" ... >
Well, it seems that SVG root element is not part of paintable elements in SVG recommandations.
So I'd suggest to use the "rect" solution provided by Robert Longson because I guess that it is not a simple "hack". It seems to be the standard way to s...
Why does this C++ snippet compile (non-void function does not return a value) [duplicate]
...e possible types and the caller might need to cast it or extract it from a union.
So the deepest cause is probably the C language creators' belief that procedures that do not return any value are just an unimportant special case of functions that do; this problem got aggravated by the lack of focus...
How does SSL really work?
...ing. Self-signed?!
Yes, at the end of the certificate chain (a.k.a. the "root"), there will be a certificate that uses it's own keypair to sign itself. This eliminates the infinite recursion problem, but it doesn't fix the authentication problem. Anybody can create a self-signed certificate that s...
ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
...tialize方法前，需要手动释放所有的全局或者静态变量。
如何手动释放呢：
设置指针指向NULL
调用Release方法，注意是要调用智能指针的Release方法，而不是内部指针的，指针指针的Release方法，会调用内部指针的Relase，然后设...