Antoine Pitrou added the comment:

> If filling out a type with all slots one-by-one is considered too
> tedious, and patching ob_type too hacky - here is another approach:
> Use FromSpec to create a type with all slots filled out, then call the
> metatype to create a subtype of that. I.e. the type which is based on
> a metatype would actually be a derived class of the type which has the
> slots defined.

As a matter of fact, this is what the io module is doing (except that
the derived type is written in Python). It does feel like pointless
complication, though.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15870>
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