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multiprocessing.Pool: When to use apply, apply_async or map?
...cept that the function call is performed in a separate process. Pool.apply blocks until the function is completed.
Pool.apply_async is also like Python's built-in apply, except that the call returns immediately instead of waiting for the result. An AsyncResult object is returned. You call its get()...
dispatch_after - GCD in Swift?
...structure:
dispatch_after(when: dispatch_time_t, queue: dispatch_queue_t, block: dispatch_block_t?)
dispatch_time_t is a UInt64. The dispatch_queue_t is actually type aliased to an NSObject, but you should just use your familiar GCD methods to get queues. The block is a Swift closure. Specificall...
How to select multiple files with ?
...
<form enctype='multipart/form-data' method='POST' action='submitFormTo.php'>
<input type='file' name='files[]' multiple />
<button type='submit'>Submit</button>
</form>
Make sure you have the enctype='multipart/form-data' attribute in your <form> tag, ...
TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi
...
For me, I already had a transaction.atomic() block, but I got this error and I had no idea why. I took this answer's advice and put a nested atomic block inside of my atomic block around the trouble-area. After that, it gave a detailed error of the integrity error I hit...
Why doesn't the height of a container element increase if it contains floated elements?
...e float property in order to set boxes side by side.
Floating an inline or block level element will make the element behave like an inline-block element.Demo
If you float an element left or right, the width of the element will be limited to the content it holds, unless width is defined explicitly .....
Handle file download from ajax post
...easily download a file from an AJAX call by setting the correct headers in PHP's response:
Setting headers server-side
header("HTTP/1.1 200 OK");
header("Pragma: public");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
// The optional second 'replace' parameter indicates whe...
Using javadoc for Python documentation [closed]
I am currently beginning with Python and I have a strong PHP background and in PHP I have took the habit of using javadoc as a documentation template.
...
Listing only directories in UNIX
...y, even if the -F option of ls isn't used. Similar to the behaviour of ls *php and how it displays all files ending with php in a directory.
– David Hancock
Oct 18 '13 at 15:24
3
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do you have kcachegrind like profiling tools for mac [closed]
...qcachegrind (brew install qcachegrind)
XHProf: A Hierarchical Profiler for PHP (pecl install xhprof)
MCG premium app can analyse your application profile data natively on your Mac (released to the Mac App Store at $27)
Profiling Viewer, available on App Store at $25
Older: MacCallGrind (semi-commer...
How to center canvas in html5
...ding-right: 0;
margin-left: auto;
margin-right: auto;
display: block;
width: 800px;
}
Edit
Since this answer is quite popular, let me add a little bit more details.
The above properties will horizontally center the canvas, div or whatever other node you have relative to it's pa...