diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 1cfb15b77102c9..0444b0f65d10ba 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -644,7 +644,7 @@ def _getfinalpathname_nonstrict(path):
# Non-strict algorithm is to find as much of the target directory
# as we can and join the rest.
- tail = ''
+ tail = path[:0]
while path:
try:
path = _getfinalpathname(path)
diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index c26c74cdd61950..646e81d1e2fa9b 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -1,5 +1,6 @@
import ntpath
import os
+import string
import sys
import unittest
import warnings
@@ -321,6 +322,16 @@ def test_realpath_basic(self):
self.assertPathEqual(ntpath.realpath(os.fsencode(ABSTFN + "1")),
os.fsencode(ABSTFN))
+ # gh-88013: call ntpath.realpath with binary drive name may raise a
+ # TypeError. The drive should not exist to reproduce the bug.
+ for c in string.ascii_uppercase:
+ d = f"{c}:\\"
+ if not ntpath.exists(d):
+ break
+ else:
+ raise OSError("No free drive letters available")
+ self.assertEqual(ntpath.realpath(d), d)
+
@os_helper.skip_unless_symlink
@unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
def test_realpath_strict(self):
diff --git a/Misc/NEWS.d/next/Windows/2023-03-18-21-38-00.gh-issue-88013.Z3loxC.rst b/Misc/NEWS.d/next/Windows/2023-03-18-21-38-00.gh-issue-88013.Z3loxC.rst
new file mode 100644
index 00000000000000..4ca3185ea1f65e
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2023-03-18-21-38-00.gh-issue-88013.Z3loxC.rst
@@ -0,0 +1,2 @@
+Fixed a bug where :exc:`TypeError` was raised when calling
+:func:`ntpath.realpath` with a bytes parameter in some cases.
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