Raymond Hettinger added the comment:
New timings look nice:
$ py -m timeit -s "r = range(10 ** 4); s = set()" "s.difference(r)"
10000000 loops, best of 3: 0.104 usec per loop
$ py -m timeit -s "r = set(range(10 ** 4)); s = set()" "s.difference(r)"
10000000 loops, best of 3: 0.105 usec per loop
$ py -m timeit -s "r = range(10 ** 4); s = set()" "s.difference_update(r)"
10000000 loops, best of 3: 0.0659 usec per loop
$ py -m timeit -s "r = set(range(10 ** 4)); s = set()"
"s.difference_update(r)"
10000000 loops, best of 3: 0.0684 usec per loop
----------
keywords: +patch
stage: needs patch -> patch review
Added file: http://bugs.python.org/file44565/set_diff_early_out.diff
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<http://bugs.python.org/issue28071>
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