From: Bartosz Sławecki <bartosz@ilikepython.com>
Date: Wed, 15 Oct 2025 16:49:14 +0000 (+0200)
Subject: gh-140141: Properly break exception chain in `importlib.metadata.Distribution.from_na... 
X-Git-Tag: v3.15.0a2~425
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bcced02604f845b2b71d0a1dd95f95366bd7774d;p=thirdparty%2FPython%2Fcpython.git

gh-140141: Properly break exception chain in `importlib.metadata.Distribution.from_name` (#140142)
---

diff --git a/Lib/importlib/metadata/__init__.py b/Lib/importlib/metadata/__init__.py
index 1e2cea400948..b010bb8525e5 100644
--- a/Lib/importlib/metadata/__init__.py
+++ b/Lib/importlib/metadata/__init__.py
@@ -457,7 +457,7 @@ class Distribution(metaclass=abc.ABCMeta):
         try:
             return next(iter(cls._prefer_valid(cls.discover(name=name))))
         except StopIteration:
-            raise PackageNotFoundError(name)
+            raise PackageNotFoundError(name) from None
 
     @classmethod
     def discover(
diff --git a/Misc/NEWS.d/next/Library/2025-10-15-17-23-51.gh-issue-140141.j2mUDB.rst b/Misc/NEWS.d/next/Library/2025-10-15-17-23-51.gh-issue-140141.j2mUDB.rst
new file mode 100644
index 000000000000..2edadbc3e388
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-10-15-17-23-51.gh-issue-140141.j2mUDB.rst
@@ -0,0 +1,5 @@
+The :py:class:`importlib.metadata.PackageNotFoundError` traceback raised when
+``importlib.metadata.Distribution.from_name`` cannot discover a
+distribution no longer includes a transient :exc:`StopIteration` exception trace.
+
+Contributed by Bartosz Sławecki in :gh:`140142`.