[3.12] gh-129843: fix pure Python implementation of warnings.warn_explicit (GH-129848) (#131350)

miss-islington · srinivasreddy · web-flow · commit e5e8b8ab44ab · 2025-03-17T12:19:09.000+01:00
gh-129843: fix pure Python implementation of `warnings.warn_explicit` (GH-129848) The pure Python implementation of `warnings.warn_explicit` constructs a `WarningMessage` with an incorrect source (it incorrectly sets the WarningMessage's line to the given `source`). (cherry picked from commit 80e00ec) Co-authored-by: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్ రెడ్డి) <thatiparthysreenivas@gmail.com>
diff --git a/Lib/warnings.py b/Lib/warnings.py
@@ -409,7 +409,7 @@ def warn_explicit(message, category, filename, lineno,
               "Unrecognized action (%r) in warnings.filters:\n %s" %
               (action, item))
     # Print message and context
-    msg = WarningMessage(message, category, filename, lineno, source)
+    msg = WarningMessage(message, category, filename, lineno, source=source)
     _showwarnmsg(msg)
 
 
diff --git a/Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst b/Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst
@@ -0,0 +1 @@
+Fix incorrect argument passing in :func:`warnings.warn_explicit`.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fix incorrect argument passing in :func:`warnings.warn_explicit`.