INADA Naoki added the comment: I'm sorry, dict.fromkeys() didn't use PyDict_MergeFromSeq2().
This may be microbench for worst case: $ ~/local/py35/bin/master -m perf timeit --rigorous --python ~/local/py35/bin/patched --compare-to ~/local/py35/bin/master -s 'L = [(i,i) for i in range(10000)]' -- 'dict(L)' master: ......................................... 2.06 ms +- 0.11 ms patched: ......................................... 2.16 ms +- 0.09 ms Median +- std dev: [master] 2.06 ms +- 0.11 ms -> [patched] 2.16 ms +- 0.09 ms: 1.05x slower $ ~/local/py27/bin/master -m perf timeit --rigorous --python ~/local/py27/bin/patched --compare-to ~/local/py27/bin/master -s 'L = [(i,i) for i in range(10000)]' -- 'dict(L)' master: ......................................... 1.48 ms +- 0.06 ms patched: ......................................... 1.57 ms +- 0.09 ms Median +- std dev: [master] 1.48 ms +- 0.06 ms -> [patched] 1.57 ms +- 0.09 ms: 1.06x slower ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27945> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
