Restore importlib.metadata to the version that worked.

Author: jaraco

Lib/importlib/metadata/__init__.py

@@ -136,6 +136,8 @@ class _EntryPointMatch(types.SimpleNamespace):
     extras: str
 
 
+from typing import Optional, List, cast, Match
+
 class EntryPoint:
     """An entry point as defined by Python packaging conventions.
 
@@ -202,7 +204,7 @@ class EntryPoint:
     value: str
     group: str
 
-    dist: Distribution | None = None
+    dist: Optional[Distribution] = None
 
     def __init__(self, name: str, value: str, group: str) -> None:
         vars(self).update(name=name, value=value, group=group)
@@ -212,7 +214,7 @@ def load(self) -> Any:
         is indicated by the value, return that module. Otherwise,
         return the named object.
         """
-        match = self.pattern.match(self.value)
+        match = cast(Match, self.pattern.match(self.value))
         module = import_module(match.group('module'))
         attrs = filter(None, (match.group('attr') or '').split('.'))
         return functools.reduce(getattr, attrs, module)
@@ -230,23 +232,11 @@ def attr(self) -> str:
         return match.group('attr')
 
     @property
-    def extras(self) -> list[str]:
+    def extras(self) -> List[str]:
         match = self.pattern.match(self.value)
         assert match is not None
         return re.findall(r'\w+', match.group('extras') or '')
 
-    @property
-    def _match(self) -> _EntryPointMatch:
-        match = self.pattern.match(self.value)
-        if not match:
-            raise ValueError(
-                'Invalid object reference. '
-                'See https://packaging.python.org'
-                '/en/latest/specifications/entry-points/#data-model',
-                self.value,
-            )
-        return _EntryPointMatch(**match.groupdict())
-
     def _for(self, dist):
         vars(self).update(dist=dist)
         return self