[issue15275] isinstance is called a more times that needed in ntpath

[STINNER Victor]

STINNER Victor added the comment:

I like ntpath_cleanup.diff, I don't think that it makes the code worse.

FYI os.fsencode() accepts str too, you can simplify:

     if isinstance(path, bytes):
-        userhome = userhome.encode(sys.getfilesystemencoding())
+        userhome = os.fsencode(userhome)

to


+    userhome = os.fsencode(userhome)

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15275>
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