Drop support for EOL Python 3.9

importlib_metadata/__init__.py

@@ -39,7 +39,7 @@
 from ._itertools import always_iterable, bucket, unique_everseen
 from ._meta import PackageMetadata, SimplePath
 from ._typing import md_none
-from .compat import py39, py311
+from .compat import py311
 
 __all__ = [
     'Distribution',
@@ -340,7 +340,7 @@ def select(self, **params) -> EntryPoints:
         Select entry points from self that match the
         given parameters (typically group and/or name).
         """
-        return EntryPoints(ep for ep in self if py39.ep_matches(ep, **params))
+        return EntryPoints(ep for ep in self if ep.matches(**params))
 
     @property
     def names(self) -> set[str]:
@@ -1088,7 +1088,7 @@ def version(distribution_name: str) -> str:
 
 _unique = functools.partial(
     unique_everseen,
-    key=py39.normalized_name,
+    key=operator.attrgetter('_normalized_name'),
 )
 """
 Wrapper for ``distributions`` to return unique distributions by name.

tests/compat/py312.py

@@ -1,6 +1,6 @@
 import contextlib
 
-from .py39 import import_helper
+from test.support import import_helper
 
 
 @contextlib.contextmanager

tests/fixtures.py

@@ -8,11 +8,16 @@
 import textwrap
 from importlib import resources
 
+from jaraco.test.cpython import from_test_support, try_import
+
 from . import _path
 from ._path import FilesSpec
-from .compat.py39 import os_helper
 from .compat.py312 import import_helper
 
+os_helper = try_import('os_helper') or from_test_support(
+    'FS_NONASCII', 'skip_unless_symlink', 'temp_dir'
+)
+
 
 @contextlib.contextmanager
 def tmp_path():

tests/test_main.py

@@ -20,7 +20,7 @@
 
 from . import fixtures
 from ._path import Symlink
-from .compat.py39 import os_helper
+from .fixtures import os_helper
 
 
 class BasicTests(fixtures.DistInfoPkg, unittest.TestCase):