[issue23573] Avoid redundant allocations in str.find and like

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23573>
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