Oh, I see, I thought he wanted to override the original logical operators. I don't like adding more operators just to make symbolic equation generation simpler. I think keeping the language simple and using the "numpy.logical_and" function is better than making the language more complicated for a small fraction of users.
There will always be a gap between Python and symbolic equation generation. On Mon, Aug 6, 2018 at 9:03 PM Steven D'Aprano <st...@pearwood.info> wrote: > On Mon, Aug 06, 2018 at 02:44:24PM -0700, Neil Girdhar wrote: > > > This doesn't work because the logical Boolean operators short circuit in > > Python. So you could not even define these operators for the regular > > Python types. > > Todd is not proposing to add dunder methods for the existing "or" and > "and" operators. > > Todd is proposing four new operators spelled "bAND", "bOR", "bXOR" and > "bNOT", which aren't short-circuiting and call dunder methods, just like > other operators including "in". > > You seem to be saying that "this" (defining new operators that call > dunder methods) doesn't work because a set of *completely different* > existing operators short-circuit. If that's not what you meant, I > don't understand what you actually did mean. > > > > Your two examples numpy and SQLAlchemy don't want this > > short-circuiting behavior, so you would never want to write anything like > > > > (some_array or some_other_array) > > > > The reader of this code might imagine that there is some short > circuiting > > or conversion to Boolean. > > Fortunately Todd isn't proposing that. > > > -- > Steve > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- > > --- > You received this message because you are subscribed to a topic in the > Google Groups "python-ideas" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/python-ideas/LgwmlPp6YqM/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > python-ideas+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. >
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