On Sunday, March 30, 2014 8:09:45 AM UTC+5:30, Roy Smith wrote: > I have no particular problem with
> x < 2 < y > because it fits the same pattern. But, if you show me > a != None != b: > my brain just goes into overload. Honestly, I don't even know what that > means. My brain keeps trying to stick a, None, and b on Mrs. Albaum's > number line and keeps walking into the wall. If you (the editorial you) > tell me that my failure to grok that expression means I'm not fluent in > Python, well then, guilty as charged. <Math Terminology> A relation that is reflexive antisymmetric and transitive is a partial order Strict order: Irreflexive asymmetric and transitive Both are strongly related For general R (partial) S (strict) S from R xSy = xRy ∧ x ≠ y R from S xRy = xSy ∨ x=y </Math Terminology> For both these chained comparisons are natural != is not transitive: 2 != 3 and 3 != 2 ⊬ 2 == 2 So for != chained comparisons are not natural (or IMHO appropriate) -- https://mail.python.org/mailman/listinfo/python-list
