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gh-129958: New syntax error in format spec applies to both f-strings and t-strings (#135570)

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Co-authored-by: Tomas R. <tomas.roun8@gmail.com>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
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Dylan 2025-06-26 08:02:50 -05:00 • committed by GitHub
parent ffb2a02f98
commit fb9e292919
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3 changed files with 5 additions and 1 deletions
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1
Lib/test/test_tstring.py
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@ -219,6 +219,7 @@ class TestTString(unittest.TestCase, TStringBaseCase):
("t'{lambda:1}'", "t-string: lambda expressions are not allowed "
"without parentheses"),
("t'{x:{;}}'", "t-string: expecting a valid expression after '{'"),
("t'{1:d\n}'", "t-string: newlines are not allowed in format specifiers")
):
with self.subTest(case), self.assertRaisesRegex(SyntaxError, err):
eval(case)

2
Misc/NEWS.d/next/Core_and_Builtins/2025-06-24-06-41-47.gh-issue-129958.EaJuS0.rst Normal file
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@ -0,0 +1,2 @@
Differentiate between t-strings and f-strings in syntax error for newlines
in format specifiers of single-quoted interpolated strings.

3
Parser/lexer/lexer.c
View file

@ -1421,7 +1421,8 @@ f_string_middle:
return MAKE_TOKEN(
_PyTokenizer_syntaxerror(
tok,
"f-string: newlines are not allowed in format specifiers for single quoted f-strings"
"%c-string: newlines are not allowed in format specifiers for single quoted %c-strings",
TOK_GET_STRING_PREFIX(tok), TOK_GET_STRING_PREFIX(tok)
)
);
}