[3.13] gh-154711: Strip comments after escaped quotes in f-string debug text - #158310
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…ng debug text When a replacement field ended with a string that had an escaped quote and was followed by a comment, the comment leaked into the debug f-string output. The comment detection loop in set_fstring_expr skips escaped characters, but the comment stripping loop did not. So an escaped quote left the scanner thinking it was still inside a string, and the comment was never removed. This makes the stripping loop skip escaped characters the same way the detection loop does. 3.14 and later already have this fix from pythongh-154719.
ArneshBanerjee
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pablogsal
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September 28, 2026 02:35
This was referenced Sep 28, 2026
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When a replacement field ended with a string that had an escaped quote and was followed by a comment, the comment leaked into the debug f-string output.
The comment detection loop in
set_fstring_exprskips escaped characters, but the comment stripping loop did not. So an escaped quote left the scanner thinking it was still inside a string, and the comment was never removed.This makes the stripping loop skip escaped characters the same way the detection loop does. 3.14 and 3.15 already have the same fix from the gh-154719 backports, and main is not affected after gh-153569, so this is 3.13 only. The tests for main are in #158220.
Replaces #154914.