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

[desbma]

desbma added the comment:

If anyone is interested, I have created a package to monkey patch shutil.copyfile to benefit from sendfile, similarly to the last patch, but it also works on older Python versions down to 2.7.

PyPI link: https://pypi.python.org/pypi/pyfastcopy/

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<http://bugs.python.org/issue25156>
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