[Python-Dev] C-level duck typing (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Thu May 17 02:03:49 CEST 2012

Dag wrote:

I'm not asking you to consider the details of all that. Just to allow some kind of high-performance extensibility of PyTypeObject, so that we can stop bothering python-dev with specific requirements from our parallel universe of nearly-all-Cython-and-Fortran-and-C++ codebases :-)

Maybe you should ask for a bit more than that.

Tp_flags bits are a scarce resource, and they shouldn't be handed out lightly to anyone who asks for one. Eventually they're going to run out, and then something else will have to be done to make further extensions of the type object possible.

So maybe it's worth thinking about making a general mechanism available for third parties to extend the type object without them all needing to have their own tp_flags bits and without needing to collude with each other to avoid conflicts.

-- Greg

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