Include the opening brace's line in multiline f-string errors

An unclosed f-string replacement field can report an error on a later line, making the opening brace hard to find:

var = "abc"
a = f""" {var} extern "C" { """
b = """ string """

  File "script.py", line 3
    b = """ string """
                   ^
SyntaxError: f-string: expecting '}'

The quotes after the second { start a string inside the replacement field. That string ends on line 3, and the final quotes start another string that is never closed.

The error should include the line number of the opening brace:

SyntaxError: f-string: expecting '}' to close '{' on line 2

The same problem affects t-strings. Valid strings inside replacement fields should continue to work.

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Oh thanks for proposing a better error message for that case that I reported. The to close '{' on line 2 addition is very useful.

gh-157778: Include opening brace line in multiline f-string errors (#…

[3.15] gh-157778: Include opening brace line in multiline f-string er…

I confirm that the change works as expected. Updated output on the reproducer:

  File "/home/vstinner/python/main/script.py", line 3
    b = """ string """
                   ^
SyntaxError: f-string: expecting '}' to close '{' on line 2

The error message now shows where '{' was opened. Cool!

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Include the opening brace's line in multiline f-string errors #157778

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Include the opening brace's line in multiline f-string errors #157778

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vstinner commented on Sep 20, 2026

vstinner commented on Sep 24, 2026

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