DEP: drop importlib_metadata as a dependency on Python 3.12 and newer

CHANGES.rst

@@ -9,6 +9,8 @@
   this inheritance may be dropped in a future asdf version. Please migrate to the new
   ``AsdfSerializationError``. [#1809]
 
+- Drop ``importlib_metadata`` as a dependency on Python 3.12 and newer [#1810]
+
 3.3.0 (2024-07-12)
 ------------------
 

asdf/_entry_points.py

@@ -1,15 +1,20 @@
+import sys
 import warnings
 
+from .exceptions import AsdfWarning
+from .extension import ExtensionProxy
+from .resource import ResourceMappingProxy
+
 # The standard library importlib.metadata returns duplicate entrypoints
 # for all python versions up to and including 3.11
 # https://github.com/python/importlib_metadata/issues/410#issuecomment-1304258228
 # see PR https://github.com/asdf-format/asdf/pull/1260
 # see issue https://github.com/asdf-format/asdf/issues/1254
-from importlib_metadata import entry_points
+if sys.version_info >= (3, 12):
+    from importlib.metadata import entry_points
+else:
+    from importlib_metadata import entry_points
 
-from .exceptions import AsdfWarning
-from .extension import ExtensionProxy
-from .resource import ResourceMappingProxy
 
 RESOURCE_MAPPINGS_GROUP = "asdf.resource_mappings"
 EXTENSIONS_GROUP = "asdf.extensions"

asdf/_tests/test_entry_points.py

@@ -1,9 +1,5 @@
-# The standard library importlib.metadata returns duplicate entrypoints
-# for all python versions up to and including 3.11
-# https://github.com/python/importlib_metadata/issues/410#issuecomment-1304258228
-# see PR https://github.com/asdf-format/asdf/pull/1260
-# see issue https://github.com/asdf-format/asdf/issues/1254
-import importlib_metadata as metadata
+import sys
+
 import pytest
 
 from asdf import _entry_points
@@ -12,6 +8,16 @@
 from asdf.extension import ExtensionProxy
 from asdf.resource import ResourceMappingProxy
 
+# The standard library importlib.metadata returns duplicate entrypoints
+# for all python versions up to and including 3.11
+# https://github.com/python/importlib_metadata/issues/410#issuecomment-1304258228
+# see PR https://github.com/asdf-format/asdf/pull/1260
+# see issue https://github.com/asdf-format/asdf/issues/1254
+if sys.version_info >= (3, 12):
+    import importlib.metadata as metadata
+else:
+    import importlib_metadata as metadata
+
 
 @pytest.fixture()
 def mock_entry_points():

asdf/util.py

@@ -4,6 +4,7 @@
 import math
 import re
 import struct
+import sys
 import types
 import warnings
 from functools import lru_cache
@@ -12,16 +13,20 @@
 
 import numpy as np
 import yaml
+from packaging.version import Version
+
+from . import constants, exceptions
 
 # The standard library importlib.metadata returns duplicate entrypoints
 # for all python versions up to and including 3.11
 # https://github.com/python/importlib_metadata/issues/410#issuecomment-1304258228
 # see PR https://github.com/asdf-format/asdf/pull/1260
 # see issue https://github.com/asdf-format/asdf/issues/1254
-from importlib_metadata import packages_distributions
-from packaging.version import Version
+if sys.version_info >= (3, 12):
+    from importlib.metadata import packages_distributions
+else:
+    from importlib_metadata import packages_distributions
 
-from . import constants, exceptions
 
 # We're importing our own copy of urllib.parse because
 # we need to patch it to support asdf:// URIs, but it'd

docs/conf.py

@@ -6,13 +6,18 @@
 else:
     import tomllib
 
+from sphinx_asdf.conf import *  # noqa: F403
+
 # The standard library importlib.metadata returns duplicate entrypoints
 # for all python versions up to and including 3.11
 # https://github.com/python/importlib_metadata/issues/410#issuecomment-1304258228
 # see PR https://github.com/asdf-format/asdf/pull/1260
 # see issue https://github.com/asdf-format/asdf/issues/1254
-from importlib_metadata import distribution
-from sphinx_asdf.conf import *  # noqa: F403
+if sys.version_info >= (3, 12):
+    from importlib.metadata import distribution
+else:
+    from importlib_metadata import distribution
+
 
 # Get configuration information from `pyproject.toml`
 with open(Path(__file__).parent.parent / "pyproject.toml", "rb") as configuration_file:

pyproject.toml

@@ -21,7 +21,7 @@ dynamic = [
 dependencies = [
   "asdf-standard>=1.1.0",
   "asdf-transform-schemas>=0.3",  # required for asdf-1.0.0 schema
-  "importlib-metadata>=4.11.4",
+  "importlib-metadata>=4.11.4 ; python_version<='3.11'",
   "jmespath>=0.6.2",
   "numpy>=1.22",
   "packaging>=19",