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bpo-44168: Fix error message in the parser for keyword arguments for invalid expressions (GH-26210)

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Pablo Galindo 2021-05-19 19:03:04 +01:00 • committed by GitHub
parent 24ccc89547
commit 33c0c90dea
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4 changed files with 1334 additions and 1284 deletions
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43
Lib/test/test_syntax.py
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@ -458,28 +458,33 @@ SyntaxError: expected ':'
... 290, 291, 292, 293, 294, 295, 296, 297, 298, 299) # doctest: +ELLIPSIS
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ..., 297, 298, 299)
# >>> f(lambda x: x[0] = 3)
# Traceback (most recent call last):
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(lambda x: x[0] = 3)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
# Check that this error doesn't trigger for names:
>>> f(a={x: for x in {}})
Traceback (most recent call last):
SyntaxError: invalid syntax
The grammar accepts any test (basically, any expression) in the
keyword slot of a call site. Test a few different options.
# >>> f(x()=2)
# Traceback (most recent call last):
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
# >>> f(a or b=1)
# Traceback (most recent call last):
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
# >>> f(x.y=1)
# Traceback (most recent call last):
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
# >>> f((x)=2)
# Traceback (most recent call last):
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
# >>> f(True=2)
# Traceback (most recent call last):
# SyntaxError: cannot assign to True here. Maybe you meant '==' instead of '='?
>>> f(x()=2)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(a or b=1)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(x.y=1)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f((x)=2)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(True=2)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(__debug__=1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
@ -1422,7 +1427,7 @@ def case(x):
case(34)
"""
compile(code, "<string>", "exec")
def test_multiline_compiler_error_points_to_the_end(self):
self._check_error(
"call(\na=1,\na=1\n)",