[New-bugs-announce] [issue43847] realpath of bytestr smb drive letters fail

[ed]

New submission from ed <ed at ene>:

some win7sp1 and win10:20H2 boxes cannot realpath a networked drive letter such as b"n:" (also affects b"n:\\")
 * observed with 3.8.7 and 3.9.1
 * 3.7.9 is fine

requirements to trigger:
 * bytestring (not unicode str)
 * just the drive letter (subfolders are ok)
 * networked drive (regular disks and vmhgfs are ok)
 * enterprise/AD network? (doesn't seem to happen with samba)

hits the following exceptions in succession:
 * access denied at L601: "path = _getfinalpathname(path)"
 * "cant concat str to bytes" at L621: "return path + tail"

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components: Windows
messages: 391074
nosy: 9001, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: realpath of bytestr smb drive letters fail
type: behavior
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43847>
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