I've just discovered operator overloading via defining a class's special methods and I think it's swell, or would be if I could figure out two things:
In order say, add things, I need to do some type checking. For a+b to work, both must be instances of the same class. I can check to see if they are instances using if type(a)==types.InstanceType, but I don't know how determine which class it is in an instance of. (This must somehow be possible because if I do "print a" without having overloaded __str__, I get <__main__.C instance at 0x815b9ec> telling me it's an instance of class C).
Also, how to I make an instance of a class from within the class? I want c = a + b to return a new instance of value a + b without changing a or b. When I define the __add__ method, I have access to self and other, whose properties I can change at will, but how do I get a fresh instance of the class that I am writing?
Thanks, zh
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