On Wed, 2 Nov 2016 at 17:34 Mikhail V <mikhail...@gmail.com> wrote: > On 2 November 2016 at 21:50, David Mertz <me...@gnosis.cx> wrote: > > Even though I really don't want new null-coalescing operators, I really > > appreciate the ternary operator in Python (or in C). > > > > On Wed, Nov 2, 2016 at 12:38 PM, Mikhail V <mikhail...@gmail.com> wrote: > >> > >> result = a > b ? x : y > >> > >> is IMHO a syntactical herecy. Such things disgust me from programming. > >> Why on earth one cannot just wrap it in function > >> c = nicefunc(a,b) > > > > > > The problem here is that the general form isn't ONLY to return 'x' or 'y' > > but the decide between arbitrary values. Hard-coding the variables into > the > > function loses 90%+ of the point. > > > > So the general function would need a signature like: > > > > c = nicefunc(a, b, x, y) > > > > The problem here is that this call might be: > > > > c = nicefunc(a, b, run_for_hours(), has_side_effects()) > > > > We only want ONE of 'x' and 'y' to eagerly evaluate. In the C or Python > > ternary we get exactly that. Obviously, that also happens in your fully > > spelled out if/else block too, but that's multiline and needs to setup > > variables not just be used as an expression. > > [Apologies for off-topic one more time] >
A quick mailing list etiquette lesson: if you know you're going off-topic then please start a new thread with a new subject line (see the subject line for this new thread as an example). Since "off-topic" means "new thread of discussion", then please just start a new thread. You can't assume that people are reading email through an email client which does threading, meaning those of us not interested in the off-topic offshoot have to read your email, realize it's off-topic, and then get passed that email to get to the next email that is on-topic (and this is still a time sink even when your first line of your reply is "this is off-topic"). So please be mindful of when you stray off-topic, and when you do then start a new thread to make managing different discussions easier for everyone.
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