Issue #23076: Path.glob() now raises a ValueError if it's called with an

invalid pattern.

Patch by Thomas Nyberg.

2 files changed, 7 insertions, 0 deletions

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index bbac773..5169ff5 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -1065,6 +1065,8 @@ class Path(PurePath):
         """Iterate over this subtree and yield all existing files (of any
         kind, including directories) matching the given pattern.
         """
+        if not pattern:
+            raise ValueError("Unacceptable pattern: {!r}".format(pattern))
         pattern = self._flavour.casefold(pattern)
         drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
         if drv or root:
diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
index b725cd9..9a98d46 100644
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -1969,6 +1969,11 @@ class PathTest(_BasePathTest, unittest.TestCase):
         else:
             self.assertRaises(NotImplementedError, pathlib.WindowsPath)
 
+    def test_glob_empty_pattern(self):
+        p = self.cls()
+        with self.assertRaisesRegex(ValueError, 'Unacceptable pattern'):
+            list(p.glob(''))
+
 
 @only_posix
 class PosixPathTest(_BasePathTest, unittest.TestCase):