bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. (GH-20659) (GH-20661)

* Refresh importlib.metadata from importlib_metadata 1.6.1.

* 📜🤖 Added by blurb_it.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
(cherry picked from commit 161541ab45)

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

Lib/importlib/metadata.py

@@ -78,6 +78,16 @@ class EntryPoint(
         attrs = filter(None, (match.group('attr') or '').split('.'))
         return functools.reduce(getattr, attrs, module)
 
+    @property
+    def module(self):
+        match = self.pattern.match(self.value)
+        return match.group('module')
+
+    @property
+    def attr(self):
+        match = self.pattern.match(self.value)
+        return match.group('attr')
+
     @property
     def extras(self):
         match = self.pattern.match(self.value)
@@ -170,7 +180,7 @@ class Distribution:
         """
         for resolver in cls._discover_resolvers():
             dists = resolver(DistributionFinder.Context(name=name))
-            dist = next(dists, None)
+            dist = next(iter(dists), None)
             if dist is not None:
                 return dist
         else:
@@ -213,6 +223,17 @@ class Distribution:
             )
         return filter(None, declared)
 
+    @classmethod
+    def _local(cls, root='.'):
+        from pep517 import build, meta
+        system = build.compat_system(root)
+        builder = functools.partial(
+            meta.build,
+            source_dir=root,
+            system=system,
+            )
+        return PathDistribution(zipfile.Path(meta.build_as_zip(builder)))
+
     @property
     def metadata(self):
         """Return the parsed metadata for this Distribution.
@@ -391,7 +412,7 @@ class FastPath:
 
     def __init__(self, root):
         self.root = root
-        self.base = os.path.basename(root).lower()
+        self.base = os.path.basename(self.root).lower()
 
     def joinpath(self, child):
         return pathlib.Path(self.root, child)
@@ -408,8 +429,8 @@ class FastPath:
         names = zip_path.root.namelist()
         self.joinpath = zip_path.joinpath
 
-        return (
-            posixpath.split(child)[0]
+        return dict.fromkeys(
+            child.split(posixpath.sep, 1)[0]
             for child in names
             )
 
@@ -475,7 +496,6 @@ class MetadataPathFinder(DistributionFinder):
             )
 
 
-
 class PathDistribution(Distribution):
     def __init__(self, path):
         """Construct a distribution from a path to the metadata directory.