[Python-Dev] Python 3.6 dict becomes compact and gets a private version; and keywords become ordered (original) (raw)

INADA Naoki songofacandy at gmail.com
Thu Sep 15 04:02:39 EDT 2016

Note that this is made at the expense of the 20% slowing down an iteration. $ ./python -m timeit -s "d = dict.fromkeys(range(10**6))" -- "list(d)" Python 3.5: 66.1 msec per loop Python 3.6: 82.5 msec per loop Are two Pythons built with same options?

In my environ:

~/local/python-master/bin/python3 -m timeit -s "d = dict.fromkeys(range(10**6))" 'list(d)' Python master (8cd9c) 100 loops, best of 3: 11 msec per loop Python 3.5.2 100 loops, best of 3: 11.6 msec per loop

And dict creation time is:

~/local/python-master/bin/python3 -m timeit "d = dict.fromkeys(range(10**6))" Python master 10 loops, best of 3: 70.1 msec per loop Python 3.5.2 10 loops, best of 3: 78.2 msec per loop

Both Python is built without neither --with-optimizations or make profile-opt. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20160915/93372294/attachment-0001.html>

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