Setting "value" of an int-derived class
Diez B. Roggisch
deets at nospam.web.de
Sun Sep 3 01:23:18 CEST 2006
Ken Schutte schrieb:
> Lets say I want an integer class that lets you attach arbitrary
> attributes. I can simply do:
> class foo(int): pass
> x = foo(5)
> x.text = "okay"
> print x, x.text # prints "5 okay"
> So, that's good. But, how can I change the value of x from 5 to
> something else, without creating a new instance?
> I suppose I could create a function that creates a new "foo" and copies
> its attributes, but is there a more direct way? Is the value "5" stored
> in some special attribute I can just directly modify?
You can't do that - the base class is immutable. Subclassing doesn't
What you can do of course in to create a class foo that will store its
value in an attribute, and overload the arithmetic operators and methods
like __int__, __long__ and __float__.
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