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[3.14] gh-129958: New syntax error in format spec applies to both f-strings and t-strings (GH-135570) #135982

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Merged
merged 1 commit into from
Jun 26, 2025
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[3.14] gh-129958: New syntax error in format spec applies to both f-strings and t-strings (GH-135570) #135982

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1 change: 1 addition & 0 deletions Lib/test/test_tstring.py
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Original file line number Diff line number Diff line change
Expand Up @@ -219,6 +219,7 @@ def test_syntax_errors(self):
("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)
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-06-24-06-41-47.gh-issue-129958.EaJuS0.rst
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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 changes: 2 additions & 1 deletion Parser/lexer/lexer.c
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Expand Up @@ -1421,7 +1421,8 @@ tok_get_fstring_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct
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)
)
);
}
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