slots? SLOTS?

[tin gherdanarra]

Dear pythonista,

what is a "slot" in python? I stumbled over
it in several meta-reflection discussions and
hard-core developer talk, but found no
mention of it in the language reference.

Google coughs up more interesting banter
about it, but no specifics. Is it a feature
that was once planned (for 2.2 or so) and
later abandoned? I find no *new* talk about
it.

Thanks for your attention
Tin