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Loop backwards using indices in Python?
... This is better than the accepted answer since it doesn't actually allocate all the numbers in memory (in Python 3 the accepted answer wouldn't either), plus it's more obvious what is happening.
– Blixt
Mar 23 '12 at 13:52
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Javascript equivalent of Python's zip function
..., unlike Python's version where the argument list is variadic. If you want all of these "features", see below. It takes just about 2 extra lines of code.
The following will mimic Python's zip behavior on edge cases where the arrays are not of equal size, silently pretending the longer parts of arra...
Using @include vs @extend in Sass?
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Extends do not allow customization, but they produce very efficient CSS.
%button
background-color: lightgrey
&:hover, &:active
background-color: white
a
@extend %button
button
@extend %button
Result:
a, button {
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Why does this (null || !TryParse) conditional result in “use of unassigned local variable”?
... illegal; if you replace dynamic with bool it compiles just fine.
I'm actually meeting with the C# team tomorrow; I'll mention it to them. Apologies for the error!
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What are detached, persistent and transient objects in hibernate?
...(but can still be modified and reattached to a new Session later though).
All this is clearly explained in the whole Chapter 10. Working with objects of the Hibernate documentation that I'm only paraphrasing above. Definitely, a must-read.
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How do I add a Maven dependency in Eclipse?
I don't know how to use Maven at all. I've been developing for a couple years with Eclipse and haven't yet needed to know about it. However, now I'm looking at some docs that suggest I do the following:
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How to update attributes without validation
...a.attributes({ ... }).save(false) instead. Or if you don't care (or want) callbacks to be run, checkout update_column.
– Joshua Pinter
Dec 10 '12 at 2:45
27
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How do you serialize a model instance in Django?
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You can easily use a list to wrap the required object and that's all what django serializers need to correctly serialize it, eg.:
from django.core import serializers
# assuming obj is a model instance
serialized_obj = serializers.serialize('json', [ obj, ])
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MySQL, Check if a column exists in a table with SQL
...pecific column, and if not — create it. Otherwise do nothing. This is really an easy procedure in any enterprise-class database, yet MySQL seems to be an exception.
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What Content-Type value should I send for my XML sitemap?
... thumb, the safest bet towards making your document be treated properly by all web servers, proxies, and client browsers, is probably the following:
Use the application/xml content type
Include a character encoding in the content type, probably UTF-8
Include a matching character encoding in the en...