[Python-Dev] signature.object, argument clinic and grouped parameters

[Nick Coghlan]

Guido, Larry and I thrashed out the required semantics for parameter groups
at PyCon US last year (and I believe the argument clinic PEP describes
those accurately).

They're mainly needed to represent oddball signatures like range() and
slice().

However, I'm inclined to say that the affected functions should simply not
support introspection until Python 3.5.

It's not just a matter of the data model, there's also the matter of
defining the string representation.

Cheers,
Nick.
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