[Python-Dev] A macro for easier rich comparisons

[Petr Viktorin]

On Tue, Apr 28, 2015 at 4:59 PM, Barry Warsaw <barry at python.org> wrote:
> On Apr 28, 2015, at 11:13 AM, Victor Stinner wrote:
>
>>It would be nice to have a six module for C extensions. I'm quite sure
>>that many projects are already full of #ifdef PYTHON3 ... #else ...
>>#endif macros.
>
> Maybe encapsulating some of the recommendations here:
>
> https://wiki.python.org/moin/PortingToPy3k/BilingualQuickRef#Python_extension_modules

py3c (or its documentation) now has all that except REPRV (with an
alias for the native string type, e.g. "PyStr", you can use that in
all reprs, so REPRV strikes me as somewhat redundant).

> (We really need to collect all this information in on place.)
>
>>> #define Py_RETURN_RICHCOMPARE(val1, val2, op)
>
> I think this macro would make a nice addition to the C API.  It might read
> better as `Py_RETURN_RICHCOMPARE(val1, op, val2)`.

(val1, val2, op) mirrors richcmp and PyObject_RichCompareBool; I think
a different order of arguments would just be confusing.