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Why are variables “i” and “j” used for counters?
...ation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one will be known as xi.
As...
Is it expensive to use try-catch blocks even if an exception is never thrown?
...rown, it now does a relatively expensive operation of walking up the stack and seeing if any try blocks exist that would catch this exception. From a layman's perspective, try may as well be free. It's actually throwing the exception that costs you - but unless you're throwing hundreds or thousands ...
How can I use Python to get the system hostname?
...at program for a local network. I would like be able to identify computers and get the user-set computer name with Python.
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How to get WordPress post featured image URL
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Check the code below and let me know if it works for you.
<?php if (has_post_thumbnail( $post->ID ) ): ?>
<?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' ); ?>
<div...
Are empty HTML5 data attributes valid?
... attributes specification doesn't mention any changes to empty attributes handling, so the general rules about empty attributes apply here:
Certain attributes may be specified by providing just the attribute name, with no value.
In the following example, the disabled attribute is given with the emp...
CSS Box Shadow - Top and Bottom Only [duplicate]
...examples of how to do this, but how can I add a box shadow only to the top and bottom of an element?
5 Answers
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DTO and DAO concepts and MVC [closed]
1) Why do we use DTO and DAO , and when should we use them. I am developing a GUI Java software to do with inserting, editing, deleting data. But I am struggling to distinguish between DTO/DAO and Model , View , Controller (MVC) Structure? Are they similar, which is better to use when i...
Wix: single MSI instead of msi + cab
My Wix project creates install.msi and cab1.cab. How can I have it bundle everything into the msi? I will likely use 7-zip SFX to work around this but I have seen other apps with only a single msi.
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How to immediately see compile errors in project tree of IntelliJ Idea?
...he project. However, it works when there's a compilation problem in a file and then I fix the problem in another file. Example: class A uses a private method of B, then change method of B to public.
– Jordan Silva
Nov 11 '19 at 11:36
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Django in / not in query
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Was trying to use this solution and ran into a problem, so if it happens to anyone else... Objs=Tbl1.objects.filter(...); IDs=Objs.values_list('id', flat=True); Objs.delete(); Tbl2.objects.filter(id__in=IDs') This did not work because IDs is actually a Quer...