On Tue, Nov 11, 2008 at 2:00 PM, Greg Ewing <[EMAIL PROTECTED]>wrote:
> M.-A. Lemburg wrote: > >> On 2008-11-11 14:28, Antoine Pitrou wrote: >> >> But why should "n/a" (or "missing", or "undefined") imply "smaller than >>> everything else"? >>> >> >> It's just a convention based on viewing None as "nothing" or the >> empty set. >> > > It would be possible to implement this convention in the > sort method, without making it a feature of comparisons > in general. > +1 None / Missing / undefined should be able to be sorted with other data. If this requires adding an optional parameter to sort, I'm fine with that. Note that this works with strings today: x = "abc" y = "abcd" x < y note that x[3] is undefined and the comparison operator (and sorting) automatically places x before y when all other elements of x and y are equal. Likewise if I created a comparison method for a class I would probably order C(a=1) < C(a=2) < C(a=2, b=3) I understand why you don't want to make None comparison work generally for the < operator. --- Bruce
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