[issue25156] shutil.copyfile should internally use os.sendfile when possible

[Berker Peksag]

Change by Berker Peksag <berker.peksag at gmail.com>:


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superseder:  -> Efficient zero-copy for shutil.copy* functions (Linux, OSX and Win)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25156>
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