Eryk Sun added the comment:
isabs also fails for device paths such as r"\\.\C:", which is an absolute path
for opening the C: volume. UNC and device paths (i.e. \\server, \\?, and \\.)
should always be considered absolute. Only logical drives (i.e. C:, D:, etc)
support drive-relative paths.
Also, join() needs to be smarter in this case:
>>> os.path.join(r'\\.\C:', 'spam')
'\\\\.\\C:spam'
It doesn't insert a backslash because the 'drive' ends in a colon. It needs to
always insert a backslash for UNC paths, which cannot be reliably identified by
checking whether the last character of the drive is a colon.
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<http://bugs.python.org/issue22302>
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