I had the number 4 in mind Though I think your idea is way better, as it's more flexible and less confusing
On Fri, Sep 28, 2018, 10:33 Brice Parent <cont...@brice.xyz> wrote: > > Le 27/09/2018 à 12:48, Ken Hilton a écrit : > > Hi Jasper, > This seems like a great idea! It looks so much cleaner, too. > > Would there be a dunder method handling this? Or since it's explicitly > just a syntax for "obj = obj.method()" is that not necessary? > My only qualm is that this might get PHP users confused; that's really not > an issue, though, since Python is not PHP. > > Anyway, I fully support this idea. > > What would the following evaluate to? > a .= b + c(d) > > 1: a = a.b + a.c(a.d) # everything is prepended an "a." > it means we dn't have access to any external elements, making the > functionality only useful in a few cases > > 2: a = a.b + a.c(d) # every first level element (if that means something) > is prepended an "a." > We still lose some of the ability to access anything outside of `a`, but a > bit less than in #1. The effort to understand the line as grown a bit, > though. > > 3: a = a.(b + c(d)) # everything is evaluated, and an "a." is prepended > to that result > (the same way `a *= 2 + 3` is equivalent to `a *= 5`) > I believe in most cases, this wouldn't mean anything to evaluate `b + > c(d)` on their own, and expect a return that can be used as an attribute of > `a`. > > 4: a = a.b + c(d) # "a." is prepended to the first element after the `=` > It is probably quite easy to read and understand, but it removes the > transitivity of the operators we have on the right, and is a bit limiting. > > 5: SyntaxError: Can only use the [whatever the name] augmented operator > with a single expression > Why not, it's a bit limiting, but is clear enough to me. > > Maybe, a simpler thing to do for this problem would be to make something > like this: > a = .b(5) + c(.d) + 3 > being the equivalent of > a = a.b(5) + c(a.d) + 3 > > I don't see any ambiguity anymore, it shortens the code a lot, and I guess > it wouldn't be hard for the compiler to recompose the line as a first > parsing step, and create the same AST with both syntaxes. > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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