Message 74551 - Python tracker

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Content 
If there is a directory to be copied to _static, Sphinx first attempts 
to delete any directory by the same name in the _static directory. See 
attached sphinx_static_exc.txt for the exception.

The simplest fix is to change the call (line 595, Sphinx 0.4.2) to::

    shutil.rmtree(targetname)

to::

    shutil.rmtree(targetname, ignore_errors=True)

It would also be preferable if instead of blindly doing rmtree/copytree, 
only updated files be copied to _static.