Bad idea. issubclass() works well. Adding operator support should be considered very carefully. I prefer a good portion of conservatism for such changes. How often the proposed change is needed? It adds a new complexity (documenting, teaching etc) without real benefits for daily jobs.
On Fri, Jun 14, 2019 at 9:42 PM Joao S. O. Bueno <jsbu...@python.org.br> wrote: > > And yet: > > This is trivial to implement in a custom metaclass - > and maybe it would make default type too "noisy". > > I am -1 on this going into normal classes, > and +0 for having a colaborative > metaclass with __lt__, __eq__ and such implementing > these on the stdlib. Maybe living in "types". > > > > > > On Fri, 14 Jun 2019 at 14:53, Brett Cannon <br...@python.org> wrote: >> >> I think the logic breaks down with multiple inheritance. If you make C(A, >> B), then you can say C > A and C > B, but then you can't say A > B or A < B >> which breaks sorting. >> >> If you want to know if a B inherits from Base, then I think `Base in >> B.mro()` will cover that just as succinctly. And if you need to know >> position you can compare indexes into the MRO. >> >> On Fri, Jun 14, 2019 at 1:06 AM eminbugrasaral--- via Python-ideas >> <python-ideas@python.org> wrote: >>> >>> Let's assume you have this model: >>> >>> ``` >>> class Base: >>> pass >>> >>> class A(Base): >>> pass >>> >>> class B(Base): >>> pass >>> >>> class C(A): >>> pass >>> ``` >>> >>> While we can do `A == B`, or `B == C` or `B == B`, I would expect to be >>> able to compare like this as well: `A >= B (if B is subclass or itself of >>> A)`, or `B <= C (if B is a subclass or itself of C)` >>> >>> Because, since == means equality check. With the same logic, a class wraps >>> another class is actually greater than this class from its type. >>> _______________________________________________ >>> Python-ideas mailing list -- python-ideas@python.org >>> To unsubscribe send an email to python-ideas-le...@python.org >>> https://mail.python.org/mailman3/lists/python-ideas.python.org/ >>> Message archived at >>> https://mail.python.org/archives/list/python-ideas@python.org/message/6W7HCI4UIEAUD6AVLFSJF5Q2X55LWYZA/ >>> Code of Conduct: http://python.org/psf/codeofconduct/ >> >> _______________________________________________ >> Python-ideas mailing list -- python-ideas@python.org >> To unsubscribe send an email to python-ideas-le...@python.org >> https://mail.python.org/mailman3/lists/python-ideas.python.org/ >> Message archived at >> https://mail.python.org/archives/list/python-ideas@python.org/message/IFW2UQNCCNYFZH3TFKD26WH7SKCP4YKT/ >> Code of Conduct: http://python.org/psf/codeofconduct/ > > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/UYNPZXZQQQQHNH7CW5M64ZFT2XKL2HPE/ > Code of Conduct: http://python.org/psf/codeofconduct/ -- Thanks, Andrew Svetlov _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/HJB5L43IH4LFTZYXHSLB3DLNFFV3LVVI/ Code of Conduct: http://python.org/psf/codeofconduct/
