[issue20849] add exist_ok to shutil.copytree

[Giampaolo Rodola']

Change by Giampaolo Rodola' <g.rodola at gmail.com>:


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assignee:  -> giampaolo.rodola
resolution:  -> fixed
stage: patch review -> commit review
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue20849>
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