Removed deprecated support for Distribution subclasses not implementi…

…ng abstract methods.

docs/conf.py

@@ -69,6 +69,4 @@
     ('py:class', 'importlib_metadata._meta._T'),
     # Workaround for #435
     ('py:class', '_T'),
-    # Other workarounds
-    ('py:class', 'importlib_metadata.DeprecatedNonAbstract'),
 ]

importlib_metadata/__init__.py

@@ -12,7 +12,6 @@
 import pathlib
 import operator
 import textwrap
-import warnings
 import functools
 import itertools
 import posixpath
@@ -334,27 +333,7 @@ def __repr__(self) -> str:
         return f'<FileHash mode: {self.mode} value: {self.value}>'
 
 
-class DeprecatedNonAbstract:
-    # Required until Python 3.14
-    def __new__(cls, *args, **kwargs):
-        all_names = {
-            name for subclass in inspect.getmro(cls) for name in vars(subclass)
-        }
-        abstract = {
-            name
-            for name in all_names
-            if getattr(getattr(cls, name), '__isabstractmethod__', False)
-        }
-        if abstract:
-            warnings.warn(
-                f"Unimplemented abstract methods {abstract}",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-        return super().__new__(cls)
-
-
-class Distribution(DeprecatedNonAbstract):
+class Distribution(metaclass=abc.ABCMeta):
     """
     An abstract Python distribution package.
 

newsfragments/+8256a9d7.removal.rst

@@ -0,0 +1 @@
+Removed deprecated support for Distribution subclasses not implementing abstract methods.

tests/test_main.py

@@ -1,16 +1,13 @@
 import re
 import pickle
 import unittest
-import warnings
 import importlib
 import importlib_metadata
-import contextlib
 from .compat.py39 import os_helper
 
 import pyfakefs.fake_filesystem_unittest as ffs
 
 from . import fixtures
-from ._context import suppress
 from ._path import Symlink
 from importlib_metadata import (
     Distribution,
@@ -25,13 +22,6 @@
 )
 
 
-@contextlib.contextmanager
-def suppress_known_deprecation():
-    with warnings.catch_warnings(record=True) as ctx:
-        warnings.simplefilter('default', category=DeprecationWarning)
-        yield ctx
-
-
 class BasicTests(fixtures.DistInfoPkg, unittest.TestCase):
     version_pattern = r'\d+\.\d+(\.\d)?'
 
@@ -56,9 +46,6 @@ def test_package_not_found_mentions_metadata(self):
 
         assert "metadata" in str(ctx.exception)
 
-    # expected to fail until ABC is enforced
-    @suppress(AssertionError)
-    @suppress_known_deprecation()
     def test_abc_enforced(self):
         with self.assertRaises(TypeError):
             type('DistributionSubclass', (Distribution,), {})()