[Python-Dev] Retrieve an arbitrary element from a set without removing it
python at rcn.com
Mon Oct 26 08:29:36 CET 2009
[John Arbash Meine]
> So 'for x in s: break' is about 2x faster than next(iter(s)) and 3x
> faster than (iter(s).next()).
The first version uses direct calls for the for-loop opcodes.
The other two have to do functions/method look-up and
make a pure python function call (neither is very fast).
FWIW, a "choose" method had been previously proposed,
discussed and rejected.
I don't find the optimization issue to be very interesting in
the case of retrieving an arbitrary element. This isn't
the kind of thing that typically appears in an inner-loop;
afterall, if you've retrieved an arbitrary element without
removing it, then successive calls to "choose" could
potentially retrieve the exact same element again and again.
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