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Implementing slicing in __getitem__
...
>>> class C(object):
... def __getitem__(self, val):
... print val
...
>>> c = C()
>>> c[3]
3
>>> c[3:4]
slice(3, 4, None)
>>> c[3:4:-2]
slice(3, 4, -2)
>>> c[():1j:'a']
slice((), 1j, 'a')
...
Why should Java ThreadLocal variables be static
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The reason is that the variables are accessed via a pointer associated with the thread. They act like global variables with thread scope, hence static is the closest fit. This is the way that you get thread local state in things like pthreads so this might just be an accident ...
What is the most ridiculous pessimization you've seen? [closed]
...re optimization is the root of all evil because it leads to unreadable/unmaintainable code. Even worse is pessimization, when someone implements an "optimization" because they think it will be faster, but it ends up being slower, as well as being buggy, unmaintainable, etc. What is the most ridi...
How to tell if JRE or JDK is installed
I have one computer that I intentionally installed JDK on. I have another computer with JRE, for, among other things, testing. However, when I got a java application working on this computer, and then tried it on another, it complained that JDK was required. How can I check if JDK was somehow instal...
How to handle screen orientation change when progress dialog and background thread active?
...ges while the dialog is up (and the background thread is going). At this point the app either crashes, or deadlocks, or gets into a weird stage where the app does not work at all until all the threads have been killed.
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Storing custom objects in an NSMutableArray in NSUserDefaults
...rchivedDataWithRootObject:objectArray] forKey:@"savedArray"];
As f3lix pointed out, you need to make your custom object comply to the NSCoding protocol. Adding methods like the following should do the trick:
- (void)encodeWithCoder:(NSCoder *)coder;
{
[coder encodeObject:label forKey:@"label...
MySQL Great Circle Distance (Haversine formula)
...ng PHP script that gets Longitude and Latitude values and then inputs them into a MySQL query. I'd like to make it solely MySQL. Here's my current PHP Code:
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Multiple inputs with same name through POST in php
...nswer to my question, I choose it as THE answer. However, the answer from Interstellar_coder is good as well, but you've explained that this can potentially be a pitfall if used incorrectly. I will be limiting the maximum number of items and I will be doing a lot of validation on this form, so I s...
How to sort an IEnumerable
...implements IEnumerable<string>, or turn an IEnumerable<string> into a sortable collection first:
List<string> myList = myEnumerable.ToList();
myList.Sort();
Based on your comment:
_components = (from c in xml.Descendants("component")
let value = (string)c
...
Running PostgreSQL in memory only
...t to create a self-contained environment you can put the Postgres binaries into SVN (but it's more than just a single executable).
You will need to run initdb to setup your test database before you can do anything with this. This can be done from a batch file or by using Runtime.exec(). But note t...