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What's a correct and good way to implement __hash__()?
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An easy, correct way to implement __hash__() is to use a key tuple. It won't be as fast as a specialized hash, but if you need that then you should probably implement the type in C.
Here's an example of using a key for hash and equality:
class A:
def __key(self):
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How do you make a deep copy of an object?
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A safe way is to serialize the object, then deserialize. This ensures everything is a brand new reference.
Here's an article about how to do this efficiently.
Caveats: It's possible for classes to override serialization such that new...
Is there a method that works like start fragment for result?
I currently have a fragment in an overlay. This is for signing in to the service. In the phone app, each of the steps I want to show in the overlay are their own screens and activities. There are 3 parts of the sign-in process and each had their own activity that was called with startActivityForResu...
How to use GROUP_CONCAT in a CONCAT in MySQL
...we get all names and values as a single value against each unique id
See this explained here SQL Fiddle Demo (scroll down as it has two result sets)
Edit There was a mistake in reading question, I had grouped only by id. But two group_contacts are needed if (Values are to be concatenated grouped by...
Mac OS X Terminal: Map option+delete to “backward delete word”
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edited Oct 23 '18 at 13:39
dsapalo
1,4601515 silve...
How to extract base URL from a string in JavaScript?
...n't take into account protocol. So I decided to upgrade the code, since it is marked as answer. For those who like one-line-code... well sorry this why we use code minimizers, code should be human readable and this way is better... in my opinion.
var pathArray = "https://somedomain.com".split( '/' ...
Is it possible to focus on a using JavaScript focus() function?
Is it possible to focus on a <div> using JavaScript focus() function?
8 Answers
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Read whole ASCII file into C++ std::string [duplicate]
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Update: Turns out that this method, while following STL idioms well, is actually surprisingly inefficient! Don't do this with large files. (See: http://insanecoding.blogspot.com/2011/11/how-to-read-in-file-in-c.html)
You can make a streambuf iterato...
Difference between global and device functions
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edited Feb 22 '16 at 17:31
Angie Quijano
3,01022 g...
check if jquery has been loaded, then load it if false
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Maybe something like this:
<script>
if(!window.jQuery)
{
var script = document.createElement('script');
script.type = "text/javascript";
script.src = "path/to/jQuery";
document.getElementsByTagName('head')[0].appendChild(script);...