value of: None is None is None
in [Python]
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From: Alan G Isaac on 25 Jun 2010 16:41 Surprising for a moment, if you don't immediatelyrecognize it as a chained comparison. (Just sharing.) Alan Isaac >>> None is None is None True >>> (None is None) is None False >>> None is (None is None) False
From: Thomas Jollans on 26 Jun 2010 05:02 On 06/25/2010 10:41 PM, Alan G Isaac wrote: > Surprising for a moment, if you don't > immediatelyrecognize it as a chained comparison. > (Just sharing.) > Alan Isaac > >>>> None is None is None > True >>>> (None is None) is None > False >>>> None is (None is None) > False > Chained comparisons - one of those language features that some of the time makes code enormously more readable, but the rest of the time are rather disconcerting to those of us coming from pretty much any other programming language. Thomas
From: D'Arcy J.M. Cain on 26 Jun 2010 07:59
On Sat, 26 Jun 2010 11:02:55 +0200 Thomas Jollans <thomas(a)jollans.com> wrote: > On 06/25/2010 10:41 PM, Alan G Isaac wrote: > >>>> None is None is None > > True > >>>> (None is None) is None > > False > >>>> None is (None is None) > > False > > Chained comparisons - one of those language features that some of the > time makes code enormously more readable, but the rest of the time are > rather disconcerting to those of us coming from pretty much any other > programming language. And yet it's seems like the "One True Way" when you think of it. I almost think that it should be... >>> None is None True >>> None is None is None Really True :-) -- D'Arcy J.M. Cain <darcy(a)druid.net> | Democracy is three wolves http://www.druid.net/darcy/ | and a sheep voting on +1 416 425 1212 (DoD#0082) (eNTP) | what's for dinner. |