[issue23359] Speed-up set_lookkey()

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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versions: +Python 3.6 -Python 3.5
Added file: http://bugs.python.org/file39505/nd_lookkey_insertkey3.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23359>
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