[coldtea]

One way might be to make the regular C extension API have a performance drop (e.g use it through some translation layer facade) and introduce a new C extension API alongside it that plays well with the necessary changes in the language.

Do you think that will be feasible for Python?

[StefanKarpinski]

Honestly, I just don't think this is going to happen in Python, but I could very well be wrong. The biggest impediment had been Guido van Rossum's (IMO understandable) reluctance to accept performance improvements that increase the complexity of the standard implementation. The fact that he works at Dropbox, which is also the home of the Pyston project gives some hope of him being more supportive of this kind thing in the future, but that's pretty thin.