Raymond Hettinger <[email protected]> added the comment:
Am rejecting the patch because it violates the sort equivalence
guarantee (including sort's promise to maintain stability).
If you need the speed and don't care about sort stability, then just use
_heapq.nsmallest() or _heapq.nlargest() directly.
We could complexify the code a bit to achieve some automatic speed-up in
the case of key==None, but my timings don't show much of an improvement:
if key is None:
it = izip(iterable, count()) # decorate
result = _nsmallest(n, it)
return map(itemgetter(0), result) # undecorate
else:
in1, in2 = tee(iterable)
it = izip(imap(key, in1), count(), in2) # decorate
result = _nsmallest(n, it)
return map(itemgetter(2), result) # undecorate
----------
assignee: -> rhettinger
nosy: +rhettinger
resolution: -> rejected
status: open -> closed
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Python tracker <[email protected]>
<http://bugs.python.org/issue4790>
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