On Fri, May 8, 2020 at 5:51 PM Henk-Jaap Wagenaar < wagenaarhenkj...@gmail.com> wrote:
> FYI, it does show in my version on gmail and on the mailman version. > <https://mail.python.org/archives/list/python-ideas@python.org/message/WJKNLRIRYT7EFX7ZH2OHXYI772XD5R3J/> > Weird, did Ethan's client cut it out? > BTW, I think strings do showcase some problems with this idea, .EQ. (as > defined by Steven) is not recursive, which I think will be > unworkable/unhelpful: > > ((0, 1), (1, 2)) and ([0, 1], [1, 2]) are not equal under the new operator > (or new behaviour of == depending as per the OP) which I think goes > completely against the idea in my book. > If we redefined == so that `(0, 1) == [0, 1]`, then it would follow that `((0, 1), (1, 2)) == ([0, 1], [1, 2])`. Similarly if `(0, 1) .EQ. [0, 1]`, then it would follow that `((0, 1), (1, 2)) .EQ. ([0, 1], [1, 2])`. > If it were (replace x==y with x == y || x .EQ. y with appropriate error > handling), strings would not work as expected (I would say), e.g.: > > [["f"], "o", "o"] .EQ. "foo" > > because a an element of a string is also a string. Worse though, I guess > any equal length string that are not equal: > > "foo" .EQ. "bar" > > would crash as it would keep recursing (i.e. string would have to be > special cased). > Yes, strings would have to be special cased. In my opinion this is another sign that strings shouldn't be iterable, see the recent heated discussion at https://mail.python.org/archives/list/python-ideas@python.org/thread/WKEFHT4JYCL2PMZ5LB6HJRLVP3OGZI56/ > What I do sometimes use/want (more often for casual coding/debugging, not > real coding) is something that compares two objects created from JSON/can > be made into JSON whether they are the same, sometimes wanting to ignore > certain fields or tell you what the difference is. I do not think that > could ever be an operator, but having a function that can help these kind > of recursive comparisons would be great (I guess pytest uses/has such a > function because it pretty nicely displays differences in sets, > dictionaries and lists which are compared to each others in asserts). > Something like https://github.com/fzumstein/jsondiff or https://pypi.org/project/json-diff/?
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