pythongh-141314: Fix TextIOWrapper.tell() assertion failure with standalone carriage return

mohsinm-dev · mohsinm-dev · commit 69960dc1755b · 2025-11-10T06:49:49.000+05:00
Add test case and fix assertion failure in TextIOWrapper.tell() when reading
files that end with a standalone carriage return (\r). The optimization
algorithm incorrectly assumed buffered data would always be available,
causing an assertion failure when next_input is empty.
diff --git a/Misc/NEWS.d/next/Library/2025-11-10-01-47-18.gh-issue-141314.baaa28.rst b/Misc/NEWS.d/next/Library/2025-11-10-01-47-18.gh-issue-141314.baaa28.rst
@@ -0,0 +1 @@
+Fix assertion failure in :meth:`io.TextIOWrapper.tell` when reading files with standalone carriage return (``\r``) line endings.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fix assertion failure in :meth:`io.TextIOWrapper.tell` when reading files with standalone carriage return (``\r``) line endings.