If I've got an object foo, and I execute:
foo.bar += baz
exactly what happens if foo does not have a 'bar' attribute? It's
pretty clear that foo.__getattr__('bar') gets called first, but it's a
little murky after that. Assume for the moment that foo.__getattr__
('bar') returns an object x. I think the complete sequence of calls
is:
foo.__getattr__('bar') ==> x
x.__add__(baz) ==> y
foo.__setattr__('bar', y)
but I'm not 100% sure. It would be nice if it was, because that would
let me do some very neat magic in a system I'm working on :-)
How would things change if X defined __iadd__()?
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