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In Django, how does one filter a QuerySet with dynamic field lookups?
...nt expansion may be used to solve this problem:
kwargs = {
'{0}__{1}'.format('name', 'startswith'): 'A',
'{0}__{1}'.format('name', 'endswith'): 'Z'
}
Person.objects.filter(**kwargs)
This is a very common and useful Python idiom.
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How to check file MIME type with javascript before upload?
...that the real validation still has to be done on server side. I want to perform a client side checking to avoid unnecessary wastage of server resource.
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Hidden features of mod_rewrite
...file. if you have access to httpd.conf, placing rules here will offer a performance benefit (as the rules are processed once, as opposed to each time the .htaccess file is called).
Logging mod_rewrite requests
Logging may be enabled from within the httpd.conf file (including <Virtual Host>):...
Java Generics (Wildcards)
...
In general,
If a structure contains elements with a type of the form ? extends E, we can get elements out of the structure, but we cannot put
elements into the structure
List<Integer> ints = new ArrayList<Integer>();
ints.add(1);
ints.add(2);
List<? extends Number> n...
Mongodb Explain for Aggregation framework
...ns
As at MongoDB 3.4, the Aggregation Framework explain option provides information on how a pipeline is processed but does not support the same level of detail as the executionStats mode for a find() query. If you are focused on optimizing initial query execution you will likely find it beneficial...
In Matplotlib, what does the argument mean in fig.add_subplot(111)?
...grid, first subplot" and "234" means "2x3 grid, 4th subplot".
Alternative form for add_subplot(111) is add_subplot(1, 1, 1).
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Shell equality operators (=, ==, -eq)
...riting a #!/bin/bash script then I recommend using [[ instead. The doubled form has more features, more natural syntax, and fewer gotchas that will trip you up. Double quotes are no longer required around $a, for one:
$ [[ $a == foo ]]; echo "$?" # bash specific
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See also:
What's the diff...
Is the 'override' keyword just a check for a overridden virtual method?
...f different, but related type. Read about covariant and contravariant transformations if interested.
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How to style the option of an html “select” element?
...ays it "supports the latest, stable releases of all major browsers and platforms"
Demo: https://developer.snapappointments.com/bootstrap-select/examples/
.special {
font-weight: bold !important;
color: #fff !important;
background: #bc0000 !important;
text-transform: uppercase;
}
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How to Set focus to first text input in a bootstrap modal after shown
...nt data-targets, rename your modals IDs to match and update the IDs of the form input fields, and finally update your JS to match these new IDs:
see http://jsfiddle.net/panchroma/owtqhpzr/5/
HTML
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<button ... data-target="#myModal1"> ... </button>
...
<!-- Modal 1 -->
&l...