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gh-93283: Improve error message for f-string with invalid conversion character (GH-93349)

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Serhiy Storchaka 2022-05-31 20:38:29 +03:00 • committed by GitHub
parent bb900712a5
commit 07df8d5b2c
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3 changed files with 53 additions and 24 deletions
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35
Lib/test/test_fstring.py
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@ -590,7 +590,9 @@ x = (
self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa')
self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa')
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
self.assertAllRaise(SyntaxError,
"""f-string: invalid conversion character 'r{"': """
"""expected 's', 'r', or 'a'""",
["""f'{"s"!r{":10"}}'""",
# This looks like a nested format spec.
@ -1012,19 +1014,28 @@ x = (
# Not a conversion, but show that ! is allowed in a format spec.
self.assertEqual(f'{3.14:!<10.10}', '3.14!!!!!!')
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
["f'{3!g}'",
"f'{3!A}'",
"f'{3!3}'",
"f'{3!G}'",
"f'{3!!}'",
"f'{3!:}'",
"f'{3! s}'", # no space before conversion char
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
["f'{3!'",
"f'{3!s'",
"f'{3!g'",
])
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
["f'{x!s{y}}'",
"f'{3!ss}'",
self.assertAllRaise(SyntaxError, 'f-string: missed conversion character',
["f'{3!}'",
"f'{3!:'",
"f'{3!:}'",
])
for conv in 'g', 'A', '3', 'G', '!', ' s', 's ', ' s ', 'ä', 'ɐ', 'ª':
self.assertAllRaise(SyntaxError,
"f-string: invalid conversion character %r: "
"expected 's', 'r', or 'a'" % conv,
["f'{3!" + conv + "}'"])
self.assertAllRaise(SyntaxError,
"f-string: invalid conversion character 'ss': "
"expected 's', 'r', or 'a'",
["f'{3!ss}'",
"f'{3!ss:}'",
"f'{3!ss:s}'",
])