[Python-Dev] Restricted API versioning

[Chris Angelico]

On Sun, Jun 24, 2012 at 9:40 AM, Christian Heimes <lists at cheimes.de> wrote:
> +1 for the general idea and for using Py_LIMITED_API. I still like my
> idea of a simple macro based on Include/patchlevel.h, for example:
>
> #define Py_API_VERSION(major, minor, micro) \
>   (((major) << 24) | ((minor) << 16) | ((micro) << 8))
>
> #if Py_LIMITED_API+0 >= Py_API_VERSION(3, 3, 0)
> #endif

This strikes me as in opposition to the Python-level policy of duck
typing. Would it be more appropriate to, instead of asking if it's
Python 3.3.0, ask if it's a Python that supports PY_FEATURE_FOOBAR? Or
would that result in an unnecessary proliferation of flag macros?

ChrisA