commit 2ad5421dad86bc95aabe5c77f6034ee6ca699992
author Benjamin Peterson <benjamin@python.org> Sun Aug 31 09:34:09 2014 -0400
committer Benjamin Peterson <benjamin@python.org> Sun Aug 31 09:34:09 2014 -0400
tree bbf0cdb9e99b8913aec6326cc378b96445a11415
parent 3f48d394930097724d5eb01499896d52ced4c4fc

don't index outside of the path (closes #22312)

Lib/ntpath.py

diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 228bbb3..fcaf21b 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -113,7 +113,7 @@
     """
     if len(p) > 1:
         normp = p.replace(altsep, sep)
-        if (normp[0:2] == sep*2) and (normp[2] != sep):
+        if (normp[0:2] == sep*2) and (normp[2:3] != sep):
             # is a UNC path:
             # vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
             # \\machine\mountpoint\directory\etc\...

Lib/test/test_ntpath.py

diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index 78af18c..7b5f7bb 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -50,6 +50,7 @@
         # Issue #19911: UNC part containing U+0130
         self.assertEqual(ntpath.splitdrive(u'//conky/MOUNTPOİNT/foo/bar'),
                          (u'//conky/MOUNTPOİNT', '/foo/bar'))
+        self.assertEqual(ntpath.splitdrive("//"), ("", "//"))
 
     def test_splitunc(self):
         tester('ntpath.splitunc("c:\\foo\\bar")',