Eryk Sun <eryk...@gmail.com> added the comment:

David, this is a bug in Python, and the proposed patch is insufficient. We use 
the volume serial number as st_dev, and this is not guaranteed to be unique in 
Windows, and may be 0, just as a file's index number is also allowed to be 0. 
Both possibilities are well documented. With a WebDAV volume you will find that 
both numbers are 0. Using the VSN and file index as if they're the same as 
POSIX st_dev and st_ino is technically wrong. There is no guarantee that this 
tuple uniquely identifies a file in Windows.

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nosy: +eryksun

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<https://bugs.python.org/issue33935>
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