GH-109653: Defer import of importlib.metadata._adapters

Lib/importlib/metadata/__init__.py

@@ -15,7 +15,7 @@
 import collections
 import inspect
 
-from . import _adapters, _meta
+from . import _meta
 from ._collections import FreezableDefaultDict, Pair
 from ._functools import method_cache, pass_none
 from ._itertools import always_iterable, unique_everseen
@@ -439,6 +439,9 @@ def metadata(self) -> _meta.PackageMetadata:
         The returned object will have keys that name the various bits of
         metadata.  See PEP 566 for details.
         """
+        # deferred for performance (python/cpython#109829)
+        from . import _adapters
+
         opt_text = (
             self.read_text('METADATA')
             or self.read_text('PKG-INFO')

Lib/importlib/resources/_common.py

@@ -12,8 +12,6 @@
 from typing import Union, Optional, cast
 from .abc import ResourceReader, Traversable
 
-from ._adapters import wrap_spec
-
 Package = Union[types.ModuleType, str]
 Anchor = Package
 
@@ -109,6 +107,9 @@ def from_package(package: types.ModuleType):
     Return a Traversable object for the given package.
 
     """
+    # deferred for performance (python/cpython#109829)
+    from ._adapters import wrap_spec
+
     spec = wrap_spec(package)
     reader = spec.loader.get_resource_reader(spec.name)
     return reader.files()

Misc/NEWS.d/next/Library/2024-03-20-23-07-58.gh-issue-109653.uu3lrX.rst

@@ -0,0 +1,2 @@
+Deferred select imports in importlib.metadata and importlib.resources for a
+14% speedup.