Finding the type of indexing supported by an object?

[Fredrik Lundh]

Derek Peschel wrote:

> I've thought about looking for keys(), looking for the special method names
> that allow you to override indexing behavior, and looking at the class or
> type of the object.  I could be wrong, but I don't think any of those
> strategies will work with all arguments.

the behaviour of obj[arg] is determined by the __getitem__ method, and
that method can do whatever it wants.

</F>