Don't use __slots__! (was Re: dicts vs classes)

[bearophileHUGS at lycos.com]

Aahz, citing Guido:
>__slots__ is a terrible hack with nasty, hard-to-fathom side
>effects that should only be used by programmers at grandmaster and
>wizard levels. Unfortunately it has gained an enormous undeserved

I think I have used __slots__ just one time. Can you tell me some of of
such bad side effects?

Bye,
bearophile