Raymond Hettinger added the comment: I'm -0 on this proposal.
There is a small speed-up to be had here: $ python3.4 -m timeit -s 'f=lambda kv: kv[0]' -s 's=[10, 20]' 'f(s)' 10000000 loops, best of 3: 0.105 usec per loop $ python3.4 -m timeit -s 'import operator' -s 'f=operator.itemgetter(0)' -s 's=[10, 20]' 'f(s)' 10000000 loops, best of 3: 0.0717 usec per loop That said, it is applied only n-times and is likely insignificant when compared to the O(n log n) sort. I think it is better to not add an intermodule dependency when we don't have to. Also if you're using CPython, then the C version of JSON is used instead of this code. So, any timings or optimizations should be tested against the other implementations (Jython or PyPy) that use them. In those implementations, I don't think itemgetter() has any performance benefit over the lambda. ---------- nosy: +rhettinger type: -> performance versions: -Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23493> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
