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gh-129093: Fix f-string debug text sometimes getting cut off when expression contains ! (#129159)

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Tomas R. 2025-01-22 01:26:37 +01:00 • committed by GitHub
parent 01bcf13a1c
commit 767cf70844
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3 changed files with 21 additions and 3 deletions
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18
Lib/test/test_fstring.py
View file

@ -1757,5 +1757,23 @@ print(f'''{{
for s in ["", "some string"]:
self.assertEqual(get_code(f"'{s}'"), get_code(f"f'{s}'"))
def test_gh129093(self):
self.assertEqual(f'{1==2=}', '1==2=False')
self.assertEqual(f'{1 == 2=}', '1 == 2=False')
self.assertEqual(f'{1!=2=}', '1!=2=True')
self.assertEqual(f'{1 != 2=}', '1 != 2=True')
self.assertEqual(f'{(1) != 2=}', '(1) != 2=True')
self.assertEqual(f'{(1*2) != (3)=}', '(1*2) != (3)=True')
self.assertEqual(f'{1 != 2 == 3 != 4=}', '1 != 2 == 3 != 4=False')
self.assertEqual(f'{1 == 2 != 3 == 4=}', '1 == 2 != 3 == 4=False')
self.assertEqual(f'{f'{1==2=}'=}', "f'{1==2=}'='1==2=False'")
self.assertEqual(f'{f'{1 == 2=}'=}', "f'{1 == 2=}'='1 == 2=False'")
self.assertEqual(f'{f'{1!=2=}'=}', "f'{1!=2=}'='1!=2=True'")
self.assertEqual(f'{f'{1 != 2=}'=}', "f'{1 != 2=}'='1 != 2=True'")
if __name__ == '__main__':
unittest.main()

2
Misc/NEWS.d/next/Core_and_Builtins/2025-01-21-23-35-41.gh-issue-129093.0rvETC.rst Normal file
View file

@ -0,0 +1,2 @@
Fix f-strings such as ``f'{expr=}'`` sometimes not displaying the full
expression when the expression contains ``!=``.

4
Parser/lexer/lexer.c
View file

@ -212,9 +212,7 @@ _PyLexer_update_fstring_expr(struct tok_state *tok, char cur)
case '}':
case '!':
case ':':
if (tok_mode->last_expr_end == -1) {
tok_mode->last_expr_end = strlen(tok->start);
}
tok_mode->last_expr_end = strlen(tok->start);
break;
default:
Py_UNREACHABLE();