On 07/07/2014 08:34 PM, Stephen J. Turnbull wrote:
> Ethan Furman writes:
>
>> And what would be this 'sensible definition' [of value equality]?
>
> I think that's the wrong question. I suppose Andreas's point is that
> when the programmer doesn't provide a definition, there is no such
> thing as a "sensible definition" to default to. I disagree, but given
> that as the point of discussion, asking what the definition is, is moot.
He eventually made that point, but until he did I thought he meant that there was such a sensible default definition, he
just wasn't sharing what he thought it might be with us.
>> 2) The 'is' operator is specialized, and should only rarely be
>> needed.
>
> Nitpick: Except that it's the preferred way to express identity with
> singletons, AFAIK. ("if x is None: ...", not "if x == None: ...".)
Not a nit at all, at least in my code -- the number of times I use '==' far outweighs the number of times I use 'is'.
Thus, 'is' is rare.
(Now, of course, I'll have to go measure that assertion and probably find out I am wrong :/ ).
--
~Ethan~
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