bpo-42089: Sync with current cpython branch of importlib_metadata (GH-22775)

~~The only differences are in the test files.~~

Automerge-Triggered-By: @jaraco

1 files changed, 9 insertions, 0 deletions

diff --git a/Lib/importlib/metadata.py b/Lib/importlib/metadata.py
index ffa0cba..302d61d 100644
--- a/Lib/importlib/metadata.py
+++ b/Lib/importlib/metadata.py
@@ -37,6 +37,15 @@ __all__ = [
 class PackageNotFoundError(ModuleNotFoundError):
     """The package was not found."""
 
+    def __str__(self):
+        tmpl = "No package metadata was found for {self.name}"
+        return tmpl.format(**locals())
+
+    @property
+    def name(self):
+        name, = self.args
+        return name
+
 
 class EntryPoint(
         collections.namedtuple('EntryPointBase', 'name value group')):