Replace the vendored twisted.reflect.namedAny with pkgutil.resolve_name.

The stdlib finally has a function for this, though it's 3.9+.

(We therefore now also include a backport dependency).

Author: Julian

jsonschema/_reflect.py

@@ -14,9 +14,13 @@
 except ImportError:
     import importlib_metadata as metadata  # type: ignore
 
+try:
+    from pkgutil import resolve_name
+except ImportError:
+    from pkgutil_resolve_name import resolve_name  # type: ignore
+
 import attr
 
-from jsonschema._reflect import namedAny
 from jsonschema.exceptions import SchemaError
 from jsonschema.validators import RefResolver, validator_for
 
@@ -130,10 +134,10 @@ def validation_success(self, instance_path):
         return ""
 
 
-def _namedAnyWithDefault(name):
+def _resolve_name_with_default(name):
     if "." not in name:
         name = "jsonschema." + name
-    return namedAny(name)
+    return resolve_name(name)
 
 
 parser = argparse.ArgumentParser(
@@ -172,7 +176,7 @@ def _namedAnyWithDefault(name):
 )
 parser.add_argument(
     "-V", "--validator",
-    type=_namedAnyWithDefault,
+    type=_resolve_name_with_default,
     help="""
         the fully qualified object name of a validator to use, or, for
         validators that are registered with jsonschema, simply the name

jsonschema/cli.py

@@ -38,7 +38,9 @@ dependencies = [
 
   "importlib_metadata;python_version<'3.8'",
   "typing_extensions;python_version<'3.8'",
+
   "importlib_resources>=1.4.0;python_version<'3.9'",
+  "pkgutil_resolve_name>=1.3.10;python_version<'3.9'",
 ]
 
 [project.optional-dependencies]