Cool idea, Michał. I hope there's at least somebody willing to try it out in practice. On 23.06.2017 02:21, Michał Żukowski wrote:
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 <mailto:steve@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/ <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 <https://en.wikipedia.org/wiki/Functional_programming>
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