subclass

I'm interested in subclassing the built-in int type in Python (I'm using v. 2.5), but having some trouble getting the initialization working. Here's some example code, which should be fairly obvious. class TestClass(int): def __init__(self): int.__init__(self, 5) However, when I try to use this I get: >>> a = TestClass() >>> a 0 where I'd expect the result to be 5 . What am I doing wrong? Google, so far, hasn't been very helpful, but I'm not really sure what I should be searching for int is immutable so you can't modify it after it is created, use __new__ instead class TestClass(int): def _

I have a very simple class which I want to use as a subclass of another one. But when I put its code in the parent's class I get : non-static variable this cannot be referenced from a static context On the other hand when I put the sublass GenTest 's class code outside the the "parent's" class code - JavaApp1 I do not get this error. public class JavaApp1 { class GenTest { @Deprecated void oldFunction() { System.out.println("don't use that"); } void newFunction() { System.out.println("That's ok."); } } public static void main(String[] args) { GenTest x = new GenTest(); x.oldFunction(); x

This came up in Hidden features of Python , but I can't see good documentation or examples that explain how the feature works. nosklo You'd use it in your own class, since no builtin class makes use of it. Numpy uses it, as stated in the documentation . Some examples here . In your own class, you'd use it like this: >>> class TestEllipsis(object): ... def __getitem__(self, item): ... if item is Ellipsis: ... return "Returning all items" ... else: ... return "return %r items" % item ... >>> x = TestEllipsis() >>> print x[2] return 2 items >>> print x[...] Returning all items Of course, there is