Armin Rigo wrote:

The C API would change a lot, so it's not reasonable to do that in the CPython repo. But it could be a third-party project, attempting to define an API like this and implement it well on top of both CPython and PyPy. IMHO this might be a better idea than just changing the API of functions defined long ago to make them more regular (e.g. stop returning borrowed references); by now this would mostly mean creating more work for the PyPy team to track and adapt to the changes, with no real benefits.

I like this idea. For example, when writing two versions of a C module, one that uses CPython internals indiscriminately and another that uses a "clean" API, such a third-party project would help. I'd also be more motivated to write two versions if I know that the project is supported by PyPy devs. Do you think that such an API might be faster than CFFI on PyPy? Stefan Krah