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Is SQL or even TSQL Turing Complete?
...a cheating).
In this set of slides Andrew Gierth proves that with CTE and Windowing SQL is Turing Complete, by constructing a cyclic tag system, which has been proved to be Turing Complete. The CTE feature is the important part however -- it allows you to create named sub-expressions that can refer...
What is the global interpreter lock (GIL) in CPython?
... leverage multiple processors on a given machine. It runs on both Unix and Windows.
And the docs for concurrent.futures.ProcessPoolExecutor explain that it uses multiprocessing as a backend:
The ProcessPoolExecutor class is an Executor subclass that uses a pool of processes to execute calls asynch...
How can HTML5 “replace” Flash? [closed]
... @Luka Ramishvili - true, but it was not like OpenGL did not work on Windows. The hugely popular Quake 2 engine came out with either software or opengl rendering. Only later around the time of Half-Life did they then add DirectX support. I think it was just that Microsoft had money to throw at...
What is a MIME type?
...rves the same purpose on the Internet that file extensions do on Microsoft Windows.
So if a server says "This is text/html" the client can go "Ah, this is an HTML document, I can render that internally", while if the server says "This is application/pdf" the client can go "Ah, I need to launch the ...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
... 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" //背景颜色}); App Inventor 2 中文网 MIT同步更新的中文本...
Use 'import module' or 'from module import'?
... from module import * can be particularly useful, if using it as: if(windows):\n\t from module_win import * \n else: \n\t from module_lin import *. Then your parent module can potentially contain OS independent function names, if the function names in module_lin & module_win have same name...
How do I remove the passphrase for the SSH key without having to create a new key?
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On windows, you can use PuttyGen to load the private key file, remove the passphrase and then overwrite the existing private key file.
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Retrieving the last record in each group - MySQL
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MySQL 8.0 now supports windowing functions, like almost all popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id...
Should I use pt or px?
...browsers to render the letters exactly that number of pixels in height:
Windows, Mac, aliased, anti-aliased, cross-browsers, doesn't matter, a font set at 14px will be 14px tall. But that isn't to say there won't still be some variation. In a quick test below, the results were slightly more consi...
How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
... pathnames separated by os.pathsep (e.g. colons on Unix or semicolons
on Windows). Non-existent directories are silently ignored.
In addition to normal directories, individual PYTHONPATH entries may
refer to zipfiles containing pure Python modules (in either source or
compiled form). Exte...