I've implemented a PoC of `where` expression some time ago. https://github.com/thektulu/cpython/commit/9e669d63d292a639eb6ba2ecea3ed2c0c23f2636
just compile and have fun. 2017-06-17 2:27 GMT+02:00 Steven D'Aprano <st...@pearwood.info>: > Welcome Robert. My response below. > > Follow-ups to Python-Ideas, thanks. You'll need to subscribe to see any > further discussion. > > > On Fri, Jun 16, 2017 at 11:32:19AM +0000, Robert Vanden Eynde wrote: > > > In a nutshell, I would like to be able to write: > > y = (b+2 for b = a + 1) > > I think this is somewhat similar to a suggestion of Nick Coghlan's. One > possible syntax as a statement might be: > > y = b + 2 given: > b = a + 1 > > > https://www.python.org/dev/peps/pep-3150/ > > In mathematics, I might write: > > y = b + 2 where b = a + 1 > > although of course I wouldn't do so for anything so simple. Here's a > better example, the quadratic formula: > > -b ± √Δ > x = ───────── > 2a > > where Δ = b² - 4ac > > although even there I'd usually write Δ in place. > > > > Python already have the "functional if", lambdas, list comprehension, > > but not simple assignment functional style. > > I think you mean "if *expression*" rather than "functional if". The term > "functional" in programming usually refers to a particular paradigm: > > https://en.wikipedia.org/wiki/Functional_programming > > > -- > 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/ >
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