On 10 May 2018 at 17:38, Ethan Furman <et...@stoneleaf.us> wrote: > On 05/10/2018 09:29 AM, M.-A. Lemburg wrote: >> >> On 10.05.2018 15:57, Guido van Rossum wrote: >>> >>> On Thu, May 10, 2018 at 5:04 AM, M.-A. Lemburg wrote: > > >>>> To a (former Pascal) programmer, a := 1 doesn't read like an >>>> operator. It's an assignment expression. If embedded expressions >>>> is where Python is heading, it should be made very clear where >>>> the embedded expression starts and where it ends on a line. >>>> >>> >>> The rules we've arrived at are about as straightforward as it gets: the >>> RHS >>> of `:=` ends at the nearest comma or close parenthesis/bracket/brace. >> >> >> That may be easy for a computer to parse, but it's not for >> a programmer. It would be better to contain such expressions >> inside a safe container which is clearly visible to a human >> eye. >> >> ohoh = a := (1, 2, 3), 4, a * 2 > > > I have no problem reading that. > >> vs. >> >> aha = ((a := (1, 2, 3)), 4, a * 2) > > > The extra parens are unneeded line noise (at least for me).
I found the version with extra parens *harder* to read. Although I will admit neither is particularly easy to read (not surprising as it's an artificial example intended to prove a point, not a real world use case) and in practice I'd write a = 1, 2, 3 ohoh = a, 4, a * 2 Look ma, no parens! Paul _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
