[issue33451] Start pyc file lock the file

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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nosy: +brett.cannon, eric.snow, ncoghlan, paul.moore, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33451>
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