[Python-Dev] PySet API

Barry Warsaw barry at python.org
Tue Mar 28 22:36:55 CEST 2006

On Mon, 2006-03-27 at 23:53 -0800, Raymond Hettinger wrote:

> While I don't favor the proposed API, I think is essential that
> you not be left hanging without good options.

Thank you.  So where does this leave us?

BTW, Guido made a suggestion in private email (which he okayed to
mention publicly).  Quoting:

"OTOH, our
experience with dicts have shown that the C dict API causes major
constraints on dict subclassing (since the C APIs mostly ignore
overridden methods) and the proliferation of their use makes it hard
to implement features like allowing arbitrary mappings as
globals/locals for exec/eval."

"Perhaps the PySet API can raise an error if it's ever called on
something that's not *exactly* a set? No subclassing allowed.
Shouldn't affect you, and should be an effective deterrent against
abuse of the kind that made the PyDict API an albatross."

This would involve changing the type test in PySet_Next() from a
PyAnySet_Check() to a PyAnySet_CheckExact() so that it only works for
sets and frozen sets.  Guido's exactly right, it wouldn't affect us so
it seems like it would be fine.  I'm not sure if this directly addresses
your concerns though, since they seem mostly centered around the safety
(or lack thereof) of PySet_Next().


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