[Errno 18] Invalid cross-device link using os.rename

[Jeff Epler]

mv is a surprisingly complex program, while os.rename is a wrapper
around rename(2) which is probably documented on your system to return
EXDEV under these circumstanes.

os.xxx is generally a fairly thin wrapper around what your OS provides,
and inherits all the "gotchas".  For some activities, os.shutil provides
something that is between os.xxx and os.system("xxx") in complexity and
capability.

Jeff
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