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Xref: csiph.com comp.lang.python:34982

> If using __getitem__ it needs to work with integers from 0 to len(f)-1,
> and raise IndexError for len(f), len(f+1), etc.

Ah, thanks.  I have a __getitem__ method, but it currently doesn't raise
IndexError.  (I'm indexing into a ring buffer, and the usage of the class
pretty much precludes indexing with an out-of-bounds index.)

S