https://github.com/python/cpython/commit/80e00ecc399db8aeaa9f3a1c87a2cfb34517d7be
commit: 80e00ecc399db8aeaa9f3a1c87a2cfb34517d7be
branch: main
author: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్  రెడ్డి) 
<thatiparthysreeni...@gmail.com>
committer: picnixz <10796600+picn...@users.noreply.github.com>
date: 2025-03-17T10:49:53Z
summary:

gh-129843: fix pure Python implementation of `warnings.warn_explicit` (#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`).

files:
A Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst
M Lib/warnings.py

diff --git a/Lib/warnings.py b/Lib/warnings.py
index 13ad6c8aacbb7f..df844253ab4e6d 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -422,7 +422,7 @@ def warn_explicit(message, category, filename, lineno,
     linecache.getlines(filename, module_globals)
 
     # 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
new file mode 100644
index 00000000000000..c16d61540edf39
--- /dev/null
+++ 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`.

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