On Thu, Jul 19, 2018 at 8:47 AM Rhodri James <rho...@kynesim.co.uk> wrote:
> On 19/07/18 09:33, Antoine Pitrou wrote: > > There is a use case I sympathize with: the argument-is-None case. For > > that I would suggest a simpler form: "A else B" which would evaluate > > to A if A is not None, otherwise to B (parentheses may be mandatory). > > > > So e.g. one of the examples would read: > > > > def insort_right(a, x, lo=0, hi=None): > > # ... > > hi = hi else len(a) > > # ... > > Much as I would like a keyword, "else" is the wrong one. It implies we > are dealing with truthiness, which we aren't, and lays a subtle semantic > trap as a consequence. > > If anyone can think of a good word for "if it isn't None, otherwise", > I'd be all for it :-) > > -- > Rhodri James *-* Kynesim Ltd > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > I think that it may look better with the order switched and the word unless, as in def insort_right(a, x, lo=0 hi=None): # ... hi = len(a) unless hi # ... Unfortunately, this does maybe feel more like checking for truthiness than non-Null value
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