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django - why is the request.POST object immutable?
...e to implement mutation methods? No: the POST object belongs to the django.http.QueryDict class, which implements a full set of mutation methods including __setitem__, __delitem__, pop and clear. It implements immutability by checking a flag when you call one of the mutation methods. And when you ca...
Check if $_POST exists
...e using method isset is not appropriate.
According to PHP documentation: http://php.net/manual/en/function.array-key-exists.php
(see Example #2 array_key_exists() vs isset())
The method array_key_exists is intended for checking key presence in array.
So code in the question could be changed as f...
Google Maps API 3 - Custom marker color for default (dot) marker
...dynamically request icon images from the Google charts api with the urls:
http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=%E2%80%A2|FE7569
Which looks like this: the image is 21x34 pixels and the pin tip is at position (10, 34)
And you'll also want a separate shadow image (so ...
Where in a virtualenv does the custom code go?
...d tear down virtualenvs it would make sense to look at virtualenvwrapper.
http://pypi.python.org/pypi/virtualenvwrapper
With virtualenvwrapper you can
* create and delete virtual environments
* organize virtual environments in a central place
* easily switch between environments
You no more ...
What is the use of static constructors?
...{
static string urlFragment = "foo/bar";
static string firstPart= "http://www.example.com/";
static string fullUrl= firstPart + urlFragment;
}
When you access fullUr, it will be "http://www.example.com/foo/bar".
Months later you're cleaning up your code and alphabetize the fields (let...
Difference between String replace() and replaceAll()
...that the later uses regex.
A: Just the regex. They both replace all :)
http://docs.oracle.com/javase/6/docs/api/java/lang/String.html
PS:
There's also a replaceFirst() (which takes a regex)
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JavaScript for detecting browser language preference [duplicate]
...age property that is obtained via javascript.
What they do affect is the HTTP 'Accept-Language' header, but it appears this value is not available through javascript at all. (Probably why @anddoutoi states he can't find a reference for it that doesn't involve server side.)
I have coded a workarou...
Difference between abstract class and interface in Python
... isn't really abstract.
Python >= 2.6:
Abstract base classes do exist (http://docs.python.org/library/abc.html). And allow you to specify methods that must be implemented in subclasses. I don't much like the syntax, but the feature is there. Most of the time it's probably better to use duck typi...
Ways to implement data versioning in MongoDB
...ight cause too much overhead, but I think it also simplifies many things.
https://github.com/thiloplanz/v7files/wiki/Vermongo
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Nested or Inner Class in PHP
... did not make it (No voting yet, no update since 2013 - as of 2016/12/29):
https://wiki.php.net/rfc/nested_classes
class foo {
public class bar {
}
}
At least, anonymous classes made it into PHP 7
https://wiki.php.net/rfc/anonymous_classes
From this RFC page:
Future Scope
The changes mad...