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Update test_fstring.py from Cpython v3.11.2 #4828

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Apr 6, 2023
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Update test_fstring.py from Cpython v3.11.2 #4828

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48 changes: 33 additions & 15 deletions Lib/test/test_fstring.py
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Original file line number Diff line number Diff line change
Expand Up @@ -663,33 +663,51 @@ def test_missing_expression(self):
["f'{}'",
"f'{ }'"
"f' {} '",
"f'{!r}'",
"f'{ !r}'",
"f'{10:{ }}'",
"f' { } '",

# The Python parser ignores also the following
# whitespace characters in additional to a space.
"f'''{\t\f\r\n}'''",
])

# Different error messeges are raised when a specfier ('!', ':' or '=') is used after an empty expression
self.assertAllRaise(SyntaxError, "f-string: expression required before '!'",
["f'{!r}'",
"f'{ !r}'",
"f'{!}'",
"f'''{\t\f\r\n!a}'''",

# Catch empty expression before the
# missing closing brace.
"f'{!'",
"f'{!s:'",

# Catch the empty expression before the
# Catch empty expression before the
# invalid conversion.
"f'{!x}'",
"f'{ !xr}'",
"f'{!x:}'",
"f'{!x:a}'",
"f'{ !xr:}'",
"f'{ !xr:a}'",
])

"f'{!}'",
"f'{:}'",

# We find the empty expression before the
# missing closing brace.
"f'{!'",
"f'{!s:'",
self.assertAllRaise(SyntaxError, "f-string: expression required before ':'",
["f'{:}'",
"f'{ :!}'",
"f'{:2}'",
"f'''{\t\f\r\n:a}'''",
"f'{:'",
"f'{:x'",
])

self.assertAllRaise(SyntaxError, "f-string: expression required before '='",
["f'{=}'",
"f'{ =}'",
"f'{ =:}'",
"f'{ =!}'",
"f'''{\t\f\r\n=}'''",
"f'{='",
])

# Different error message is raised for other whitespace characters.
Expand Down Expand Up @@ -820,10 +838,10 @@ def test_no_escapes_for_braces(self):
Only literal curly braces begin an expression.
"""
# \x7b is '{'.
# TODO: RUSTPYTHON self.assertEqual(f'\x7b1+1}}', '{1+1}')
# TODO: RUSTPYTHON self.assertEqual(f'\x7b1+1', '{1+1')
# TODO: RUSTPYTHON self.assertEqual(f'\u007b1+1', '{1+1')
# TODO: RUSTPYTHON self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}')
self.assertEqual(f'\x7b1+1}}', '{1+1}')
self.assertEqual(f'\x7b1+1', '{1+1')
self.assertEqual(f'\u007b1+1', '{1+1')
self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}')

def test_newlines_in_expressions(self):
self.assertEqual(f'{0}', '0')
Expand Down