Merge fix for bpo-46246

Author: jaraco

CHANGES.rst

@@ -1,3 +1,8 @@
+v4.11.0
+=======
+
+* bpo-46246: Added ``__slots__`` to ``EntryPoints``.
+
 v4.10.2
 =======
 

importlib_metadata/__init__.py

@@ -283,6 +283,8 @@ class DeprecatedList(list):
     1
     """
 
+    __slots__ = ()
+
     _warn = functools.partial(
         warnings.warn,
         "EntryPoints list interface is deprecated. Cast to list if needed.",

tests/test_api.py

@@ -180,6 +180,11 @@ def test_entry_points_groups_get(self):
             entry_points().get('entries', 'default') == entry_points()['entries']
             entry_points().get('missing', ()) == ()
 
+    def test_entry_points_allows_no_attributes(self):
+        ep = entry_points().select(group='entries', name='main')
+        with self.assertRaises(AttributeError):
+            ep.foo = 4
+
     def test_metadata_for_this_package(self):
         md = metadata('egginfo-pkg')
         assert md['author'] == 'Steven Ma'