[3.9] bpo-28002: Roundtrip f-strings with ast.unparse better (GH-19612)#23430
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By attempting to avoid backslashes in f-string expressions.
We also now proactively raise errors for some backslashes we can't
avoid while unparsing FormattedValues
Co-authored-by: hauntsaninja <>
Co-authored-by: Shantanu [email protected]
Co-authored-by: Batuhan Taskaya [email protected]
(cherry picked from commit a993e90)
Co-authored-by: Shantanu [email protected]
https://bugs.python.org/issue28002
Automerge-Triggered-By: GH:isidentical