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3339 lines (2725 loc) · 110 KB
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"""This module tests SyntaxErrors.
Here's an example of the sort of thing that is tested.
>>> def f(x):
... global x
Traceback (most recent call last):
SyntaxError: name 'x' is parameter and global
The tests are all raise SyntaxErrors. They were created by checking
each C call that raises SyntaxError. There are several modules that
raise these exceptions-- ast.c, compile.c, future.c, pythonrun.c, and
symtable.c.
The parser itself outlaws a lot of invalid syntax. None of these
errors are tested here at the moment. We should add some tests; since
there are infinitely many programs with invalid syntax, we would need
to be judicious in selecting some.
The compiler generates a synthetic module name for code executed by
doctest. Since all the code comes from the same module, a suffix like
[1] is appended to the module name, As a consequence, changing the
order of tests in this module means renumbering all the errors after
it. (Maybe we should enable the ellipsis option for these tests.)
In ast.c, syntax errors are raised by calling ast_error().
Errors from set_context():
>>> obj.None = 1
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> obj.True = 1
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> True = 1
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> (True := 1)
Traceback (most recent call last):
SyntaxError: cannot use assignment expressions with True
>>> obj.__debug__ = 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> __debug__ = 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> (__debug__ := 1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> def __debug__(): pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> async def __debug__(): pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> class __debug__: pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> del __debug__
Traceback (most recent call last):
SyntaxError: cannot delete __debug__
>>> f() = 1 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?
>>> yield = 1
Traceback (most recent call last):
SyntaxError: assignment to yield expression not possible
>>> del f() # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot delete function call
>>> a + 1 = 2 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to expression here. Maybe you meant '==' instead of '='?
>>> (x for x in x) = 1
Traceback (most recent call last):
SyntaxError: cannot assign to generator expression
>>> 1 = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
>>> "abc" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
>>> b"" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
>>> ... = 1
Traceback (most recent call last):
SyntaxError: cannot assign to ellipsis here. Maybe you meant '==' instead of '='?
>>> `1` = 1
Traceback (most recent call last):
SyntaxError: invalid syntax
If the left-hand side of an assignment is a list or tuple, an illegal
expression inside that contain should still cause a syntax error.
This test just checks a couple of cases rather than enumerating all of
them.
>>> (a, "b", c) = (1, 2, 3) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to literal
>>> (a, True, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> (a, __debug__, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> (a, *True, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> (a, *__debug__, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> [a, b, c + 1] = [1, 2, 3]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> [a, b[1], c + 1] = [1, 2, 3]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> [a, b.c.d, c + 1] = [1, 2, 3]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> a if 1 else b = 1
Traceback (most recent call last):
SyntaxError: cannot assign to conditional expression
>>> a = 42 if True
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression
>>> a = (42 if True)
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression
>>> a = [1, 42 if True, 4]
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression
>>> x = 1 if 1 else pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected expression after 'else', but statement is given
>>> x = pass if 1 else 1 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected expression before 'if', but statement is given
>>> x = pass if 1 else pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected expression before 'if', but statement is given
>>> if True:
... print("Hello"
...
... if 2:
... print(123))
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> True = True = 3
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> x = y = True = z = 3
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> x = y = yield = 1
Traceback (most recent call last):
SyntaxError: assignment to yield expression not possible
>>> a, b += 1, 2 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'tuple' is an illegal expression for augmented assignment
>>> (a, b) += 1, 2 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'tuple' is an illegal expression for augmented assignment
>>> [a, b] += 1, 2 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'list' is an illegal expression for augmented assignment
Invalid targets in `for` loops and `with` statements should also
produce a specialized error message
>>> for a() in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> for (a, b()) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> for [a, b()] in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> for (*a, b, c+1) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> for (x, *(y, z.d())) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> for a, b() in c: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> for a, b, (c + 1, d()): pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> for i < (): pass # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> for a, b
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> with a as b(): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> with a as (b, c()): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> with a as [b, c()]: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> with a as (*b, c, d+1): pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> with a as (x, *(y, z.d())): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> with a as b, c as d(): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> with a as b
Traceback (most recent call last):
SyntaxError: expected ':'
>>> p = p =
Traceback (most recent call last):
SyntaxError: invalid syntax
Comprehensions without 'in' keyword:
>>> [x for x if range(1)] # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'in' expected after for-loop variables
>>> tuple(x for x if range(1)) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'in' expected after for-loop variables
>>> [x for x() in a]
Traceback (most recent call last):
SyntaxError: cannot assign to function call
>>> [x for a, b, (c + 1, d()) in y]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> [x for a, b, (c + 1, d()) if y] # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'in' expected after for-loop variables
>>> [x for x+1 in y]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
>>> [x for x+1, x() in y]
Traceback (most recent call last):
SyntaxError: cannot assign to expression
Comprehensions creating tuples without parentheses
should produce a specialized error message:
>>> [x,y for x,y in range(100)] # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: did you forget parentheses around the comprehension target?
>>> {x,y for x,y in range(100)} # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: did you forget parentheses around the comprehension target?
# Incorrectly closed strings
>>> "The interesting object "The important object" is very important" # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: invalid syntax. Is this intended to be part of the string?
# Missing commas in literals collections should not
# produce special error messages regarding missing
# parentheses, but about missing commas instead
>>> [1, 2 3]
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?
>>> {1, 2 3}
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?
>>> {1:2, 2:5 3:12}
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?
>>> (1, 2 3)
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?
# Make sure soft keywords constructs don't raise specialized
# errors regarding missing commas or other spezialiced errors
>>> match x: # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... y = 3
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> match x:
... case y:
... 3 $ 3
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> match x:
... case $:
... ...
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> match ...: # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... case {**rest, "key": value}:
... ...
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> match ...:
... case {**_}:
... ...
Traceback (most recent call last):
SyntaxError: invalid syntax
# But prefixes of soft keywords should
# still raise specialized errors
>>> (mat x) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?
From compiler_complex_args():
>>> def f(None=1):
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
From ast_for_arguments():
>>> def f(x, y=1, z):
... pass
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default
>>> def f(x, /, y=1, z):
... pass
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default
>>> def f(x, None):
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> def f(*None): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> def f(**None):
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> def foo(/,a,b=,c):
... pass
Traceback (most recent call last):
SyntaxError: at least one argument must precede /
>>> def foo(a,/,/,b,c):
... pass
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> def foo(a,/,a1,/,b,c):
... pass
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> def foo(a=1,/,/,*b,/,c):
... pass
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> def foo(a,/,a1=1,/,b,c):
... pass
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> def foo(a,*b,c,/,d,e):
... pass
Traceback (most recent call last):
SyntaxError: / must be ahead of *
>>> def foo(a=1,*b,c=3,/,d,e):
... pass
Traceback (most recent call last):
SyntaxError: / must be ahead of *
>>> def foo(a,*b=3,c):
... pass
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value
>>> def foo(a,*b: int=,c):
... pass
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value
>>> def foo(a,**b=3): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value
>>> def foo(a,**b: int=3): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value
>>> def foo(a,*a, b, **c, d):
... pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> def foo(a,*a, b, **c, d=4):
... pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> def foo(a,*a, b, **c, *d):
... pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> def foo(a,*a, b, **c, **d):
... pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> def foo(a=1,/,**b,/,c):
... pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> def foo(*b,*d):
... pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> def foo(a,*b,c,*d,*e,c):
... pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> def foo(a,b,/,c,*b,c,*d,*e,c):
... pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> def foo(a,b,/,c,*b,c,*d,**e):
... pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> def foo(a=1,/*,b,c): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: expected comma between / and *
>>> def foo(a=1,d=,c): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: expected default value expression
>>> def foo(a,d=,c): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: expected default value expression
>>> def foo(a,d: int=,c): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: expected default value expression
>>> lambda /,a,b,c: None
Traceback (most recent call last):
SyntaxError: at least one argument must precede /
>>> lambda a,/,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> lambda a,/,a1,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> lambda a=1,/,/,*b,/,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> lambda a,/,a1=1,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once
>>> lambda a,*b,c,/,d,e: None
Traceback (most recent call last):
SyntaxError: / must be ahead of *
>>> lambda a=1,*b,c=3,/,d,e: None
Traceback (most recent call last):
SyntaxError: / must be ahead of *
>>> lambda a=1,/*,b,c: None # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected comma between / and *
>>> lambda a,*b=3,c: None
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value
>>> lambda a,**b=3: None # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value
>>> lambda a, *a, b, **c, d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> lambda a,*a, b, **c, d=4: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> lambda a,*a, b, **c, *d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> lambda a,*a, b, **c, **d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> lambda a=1,/,**b,/,c: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument
>>> lambda *b,*d: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> lambda a,*b,c,*d,*e,c: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> lambda a,b,/,c,*b,c,*d,*e,c: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> lambda a,b,/,c,*b,c,*d,**e: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once
>>> lambda a=1,d=,c: None # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected default value expression
>>> lambda a,d=,c: None # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected default value expression
>>> lambda a,d=3,c: None
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default
>>> lambda a,/,d=3,c: None
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default
>>> import ast; ast.parse('''
... def f(
... *, # type: int
... a, # type: int
... ):
... pass
... ''', type_comments=True) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: bare * has associated type comment
From ast_for_funcdef():
>>> def None(x):
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
From ast_for_call():
>>> def f(it, *varargs, **kwargs):
... return list(it)
>>> L = range(10)
>>> f(x for x in L)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> f(x for x in L, 1)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, y=1)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, *[])
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, **{})
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(L, x for x in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, y for y in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L,)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f((x for x in L), 1)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> class C(x for x in L): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
Traceback (most recent call last):
SyntaxError: invalid syntax
>>> def g(*args, **kwargs):
... print(args, sorted(kwargs.items()))
>>> g(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
... 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
... 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
... 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
... 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
... 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
... 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
... 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
... 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
... 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
... 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
... 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
... 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
... 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
... 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
... 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
... 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
... 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
... 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289,
... 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) []
>>> g(a000=0, a001=1, a002=2, a003=3, a004=4, a005=5, a006=6, a007=7, a008=8,
... a009=9, a010=10, a011=11, a012=12, a013=13, a014=14, a015=15, a016=16,
... a017=17, a018=18, a019=19, a020=20, a021=21, a022=22, a023=23, a024=24,
... a025=25, a026=26, a027=27, a028=28, a029=29, a030=30, a031=31, a032=32,
... a033=33, a034=34, a035=35, a036=36, a037=37, a038=38, a039=39, a040=40,
... a041=41, a042=42, a043=43, a044=44, a045=45, a046=46, a047=47, a048=48,
... a049=49, a050=50, a051=51, a052=52, a053=53, a054=54, a055=55, a056=56,
... a057=57, a058=58, a059=59, a060=60, a061=61, a062=62, a063=63, a064=64,
... a065=65, a066=66, a067=67, a068=68, a069=69, a070=70, a071=71, a072=72,
... a073=73, a074=74, a075=75, a076=76, a077=77, a078=78, a079=79, a080=80,
... a081=81, a082=82, a083=83, a084=84, a085=85, a086=86, a087=87, a088=88,
... a089=89, a090=90, a091=91, a092=92, a093=93, a094=94, a095=95, a096=96,
... a097=97, a098=98, a099=99, a100=100, a101=101, a102=102, a103=103,
... a104=104, a105=105, a106=106, a107=107, a108=108, a109=109, a110=110,
... a111=111, a112=112, a113=113, a114=114, a115=115, a116=116, a117=117,
... a118=118, a119=119, a120=120, a121=121, a122=122, a123=123, a124=124,
... a125=125, a126=126, a127=127, a128=128, a129=129, a130=130, a131=131,
... a132=132, a133=133, a134=134, a135=135, a136=136, a137=137, a138=138,
... a139=139, a140=140, a141=141, a142=142, a143=143, a144=144, a145=145,
... a146=146, a147=147, a148=148, a149=149, a150=150, a151=151, a152=152,
... a153=153, a154=154, a155=155, a156=156, a157=157, a158=158, a159=159,
... a160=160, a161=161, a162=162, a163=163, a164=164, a165=165, a166=166,
... a167=167, a168=168, a169=169, a170=170, a171=171, a172=172, a173=173,
... a174=174, a175=175, a176=176, a177=177, a178=178, a179=179, a180=180,
... a181=181, a182=182, a183=183, a184=184, a185=185, a186=186, a187=187,
... a188=188, a189=189, a190=190, a191=191, a192=192, a193=193, a194=194,
... a195=195, a196=196, a197=197, a198=198, a199=199, a200=200, a201=201,
... a202=202, a203=203, a204=204, a205=205, a206=206, a207=207, a208=208,
... a209=209, a210=210, a211=211, a212=212, a213=213, a214=214, a215=215,
... a216=216, a217=217, a218=218, a219=219, a220=220, a221=221, a222=222,
... a223=223, a224=224, a225=225, a226=226, a227=227, a228=228, a229=229,
... a230=230, a231=231, a232=232, a233=233, a234=234, a235=235, a236=236,
... a237=237, a238=238, a239=239, a240=240, a241=241, a242=242, a243=243,
... a244=244, a245=245, a246=246, a247=247, a248=248, a249=249, a250=250,
... a251=251, a252=252, a253=253, a254=254, a255=255, a256=256, a257=257,
... a258=258, a259=259, a260=260, a261=261, a262=262, a263=263, a264=264,
... a265=265, a266=266, a267=267, a268=268, a269=269, a270=270, a271=271,
... a272=272, a273=273, a274=274, a275=275, a276=276, a277=277, a278=278,
... a279=279, a280=280, a281=281, a282=282, a283=283, a284=284, a285=285,
... a286=286, a287=287, a288=288, a289=289, a290=290, a291=291, a292=292,
... a293=293, a294=294, a295=295, a296=296, a297=297, a298=298, a299=299)
... # doctest: +ELLIPSIS
() [('a000', 0), ('a001', 1), ('a002', 2), ..., ('a298', 298), ('a299', 299)]
>>> class C:
... def meth(self, *args):
... return args
>>> obj = C()
>>> obj.meth(
... 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
... 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
... 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
... 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
... 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
... 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
... 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
... 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
... 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
... 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
... 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
... 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
... 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
... 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
... 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
... 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
... 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
... 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
... 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289,
... 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) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
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) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(a or b=1) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(x.y=1) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f((x)=2) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(True=1) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> f(False=1) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to False
>>> f(None=1) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> f(__debug__=1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> __debug__: int
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> x.__debug__: int
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> f(a=) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(a, b, c=) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(a, b, c=, d) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(*args=[0]) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to iterable argument unpacking
>>> f(a, b, *args=[0]) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to iterable argument unpacking
>>> f(**kwargs={'a': 1}) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to keyword argument unpacking
>>> f(a, b, *args, **kwargs={'a': 1}) # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: cannot assign to keyword argument unpacking
More set_context():
>>> (x for x in x) += 1 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'generator expression' is an illegal expression for augmented assignment
>>> None += 1 # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
Traceback (most recent call last):
SyntaxError: 'None' is an illegal expression for augmented assignment
>>> __debug__ += 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> f() += 1 # TODO: RUSTPYTHON; Raises an exception # doctest: +SKIP
Traceback (most recent call last): # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
SyntaxError: 'function call' is an illegal expression for augmented assignment
Test control flow in finally
continue in for loop under finally should be ok.
>>> def test():
... try:
... pass
... finally:
... for abc in range(10):
... continue
... print(abc)
>>> test()
9
break in for loop under finally should be ok.
>>> def test():
... try:
... pass
... finally:
... for abc in range(10):
... break
... print(abc)
>>> test()
0
return in function under finally should be ok.
>>> def test():
... try:
... pass
... finally:
... def f():
... return 42
... print(f())
>>> test()
42
combine for loop and function def
return in function under finally should be ok.
>>> def test():
... try:
... pass
... finally:
... for i in range(10):
... def f():
... return 42
... print(f())
>>> test()
42
>>> def test():
... try:
... pass
... finally:
... def f():
... for i in range(10):
... return 42
... print(f())
>>> test()
42
A continue outside loop should not be allowed.
>>> def foo():
... try:
... continue
... finally:
... pass
Traceback (most recent call last):
...
SyntaxError: 'continue' not properly in loop
There is one test for a break that is not in a loop. The compiler
uses a single data structure to keep track of try-finally and loops,
so we need to be sure that a break is actually inside a loop. If it
isn't, there should be a syntax error.
>>> try:
... print(1)
... break
... print(2)
... finally:
... print(3)
Traceback (most recent call last):
...
SyntaxError: 'break' outside loop
elif can't come after an else.
>>> if a % 2 == 0: # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
... pass
... else:
... pass
... elif a % 2 == 1:
... pass
Traceback (most recent call last):
...
SyntaxError: 'elif' block follows an 'else' block
Misuse of the nonlocal and global statement can lead to a few unique syntax errors.
>>> def f():
... print(x)
... global x
Traceback (most recent call last):
...
SyntaxError: name 'x' is used prior to global declaration
>>> def f():
... x = 1
... global x
Traceback (most recent call last):
...
SyntaxError: name 'x' is assigned to before global declaration
>>> def f(x):
... global x
Traceback (most recent call last):
...
SyntaxError: name 'x' is parameter and global
>>> def f():
... x = 1
... def g():
... print(x)
... nonlocal x
Traceback (most recent call last):
...
SyntaxError: name 'x' is used prior to nonlocal declaration