[Python-Dev] Py2.6 buildouts to the set API
"Martin v. Löwis"
martin at v.loewis.de
Sat May 19 09:19:36 CEST 2007
> * New method (proposed by Shane Holloway): s1.isdisjoint(s2).
> Logically equivalent to "not s1.intersection(s2)" but has an
> early-out if a common member is found. The speed-up is potentially
> large given two big sets that may largely overlap or may not
> intersect at all. There is also a memory savings since a new set
> does not have to be formed and then thrown away.
I'd rather see iterator versions of the set operations. Then you
> * Additional optional arguments for basic set operations to allow
> chained operations. For example, s=s1.union(s2, s3, s4) would be
> logically equivalent to s=s1.union(s2).union(s3).union(s4) but would
> run faster because no intermediate sets are created, copied, and
> discarded. It would run as if written: s=s1.copy(); s.update(s2);
> s.update(s3); s.update(s4).
I'd rather see this as collections.bigunion.
> * Make sets listenable for changes (proposed by Jason Wells):
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