
I've implemented a PoC of `where` expression some time ago. https://github.com/thektulu/cpython/commit/9e669d63d292a639eb6ba2ecea3ed2c0c... just compile and have fun. 2017-06-17 2:27 GMT+02:00 Steven D'Aprano <steve@pearwood.info>:
Welcome Robert. My response below.
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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/