mirror of https://github.com/python/cpython
990 lines
33 KiB
Python
990 lines
33 KiB
Python
"""This module tests SyntaxErrors.
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Here's an example of the sort of thing that is tested.
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>>> def f(x):
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... global x
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Traceback (most recent call last):
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SyntaxError: name 'x' is parameter and global
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The tests are all raise SyntaxErrors. They were created by checking
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each C call that raises SyntaxError. There are several modules that
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raise these exceptions-- ast.c, compile.c, future.c, pythonrun.c, and
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symtable.c.
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The parser itself outlaws a lot of invalid syntax. None of these
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errors are tested here at the moment. We should add some tests; since
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there are infinitely many programs with invalid syntax, we would need
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to be judicious in selecting some.
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The compiler generates a synthetic module name for code executed by
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doctest. Since all the code comes from the same module, a suffix like
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[1] is appended to the module name, As a consequence, changing the
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order of tests in this module means renumbering all the errors after
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it. (Maybe we should enable the ellipsis option for these tests.)
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In ast.c, syntax errors are raised by calling ast_error().
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Errors from set_context():
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>>> obj.None = 1
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> None = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to None
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>>> obj.True = 1
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> True = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to True
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>>> (True := 1)
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Traceback (most recent call last):
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SyntaxError: cannot use assignment expressions with True
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>>> obj.__debug__ = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> __debug__ = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> (__debug__ := 1)
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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> f() = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> yield = 1
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Traceback (most recent call last):
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SyntaxError: assignment to yield expression not possible
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>>> del f()
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Traceback (most recent call last):
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SyntaxError: cannot delete function call
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>>> a + 1 = 2
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> (x for x in x) = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to generator expression
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>>> 1 = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to literal
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>>> "abc" = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to literal
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>>> b"" = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to literal
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>>> ... = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to Ellipsis
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>>> `1` = 1
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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If the left-hand side of an assignment is a list or tuple, an illegal
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expression inside that contain should still cause a syntax error.
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This test just checks a couple of cases rather than enumerating all of
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them.
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>>> (a, "b", c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: cannot assign to literal
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>>> (a, True, c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: cannot assign to True
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>>> (a, __debug__, c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> (a, *True, c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: cannot assign to True
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>>> (a, *__debug__, c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> [a, b, c + 1] = [1, 2, 3]
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> [a, b[1], c + 1] = [1, 2, 3]
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> [a, b.c.d, c + 1] = [1, 2, 3]
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> a if 1 else b = 1
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Traceback (most recent call last):
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SyntaxError: cannot assign to conditional expression
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>>> True = True = 3
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Traceback (most recent call last):
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SyntaxError: cannot assign to True
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>>> x = y = True = z = 3
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Traceback (most recent call last):
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SyntaxError: cannot assign to True
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>>> x = y = yield = 1
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Traceback (most recent call last):
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SyntaxError: assignment to yield expression not possible
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>>> a, b += 1, 2
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Traceback (most recent call last):
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SyntaxError: 'tuple' is an illegal expression for augmented assignment
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>>> (a, b) += 1, 2
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Traceback (most recent call last):
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SyntaxError: 'tuple' is an illegal expression for augmented assignment
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>>> [a, b] += 1, 2
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Traceback (most recent call last):
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SyntaxError: 'list' is an illegal expression for augmented assignment
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Invalid targets in `for` loops and `with` statements should also
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produce a specialized error message
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>>> for a() in b: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> for (a, b()) in b: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> for [a, b()] in b: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> for (*a, b, c+1) in b: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> for (x, *(y, z.d())) in b: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> for a, b() in c: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> for a, b, (c + 1, d()): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> for i < (): pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> for a, b
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> with a as b(): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> with a as (b, c()): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> with a as [b, c()]: pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> with a as (*b, c, d+1): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to operator
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>>> with a as (x, *(y, z.d())): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> with a as b, c as d(): pass
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Traceback (most recent call last):
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SyntaxError: cannot assign to function call
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>>> with a as b
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> p = p =
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From compiler_complex_args():
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>>> def f(None=1):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From ast_for_arguments():
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>>> def f(x, y=1, z):
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... pass
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Traceback (most recent call last):
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SyntaxError: non-default argument follows default argument
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>>> def f(x, None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def f(*None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def f(**None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> import ast; ast.parse('''
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... def f(
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... *, # type: int
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... a, # type: int
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... ):
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... pass
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... ''', type_comments=True)
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Traceback (most recent call last):
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SyntaxError: bare * has associated type comment
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From ast_for_funcdef():
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>>> def None(x):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From ast_for_call():
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>>> def f(it, *varargs, **kwargs):
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... return list(it)
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>>> L = range(10)
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>>> f(x for x in L)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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>>> f(x for x in L, 1)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, y=1)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, *[])
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, **{})
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(L, x for x in L)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, y for y in L)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L,)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f((x for x in L), 1)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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>>> class C(x for x in L):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def g(*args, **kwargs):
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... print(args, sorted(kwargs.items()))
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>>> g(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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... 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
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... 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
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... 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
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... 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
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... 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
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... 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
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... 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
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... 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
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... 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
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... 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
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... 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
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... 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
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... 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
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... 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
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... 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
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... 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
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... 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
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... 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289,
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... 290, 291, 292, 293, 294, 295, 296, 297, 298, 299) # doctest: +ELLIPSIS
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(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ..., 297, 298, 299) []
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>>> g(a000=0, a001=1, a002=2, a003=3, a004=4, a005=5, a006=6, a007=7, a008=8,
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... a009=9, a010=10, a011=11, a012=12, a013=13, a014=14, a015=15, a016=16,
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... a017=17, a018=18, a019=19, a020=20, a021=21, a022=22, a023=23, a024=24,
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... a025=25, a026=26, a027=27, a028=28, a029=29, a030=30, a031=31, a032=32,
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... a033=33, a034=34, a035=35, a036=36, a037=37, a038=38, a039=39, a040=40,
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... a041=41, a042=42, a043=43, a044=44, a045=45, a046=46, a047=47, a048=48,
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... a049=49, a050=50, a051=51, a052=52, a053=53, a054=54, a055=55, a056=56,
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... a057=57, a058=58, a059=59, a060=60, a061=61, a062=62, a063=63, a064=64,
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... a065=65, a066=66, a067=67, a068=68, a069=69, a070=70, a071=71, a072=72,
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... a073=73, a074=74, a075=75, a076=76, a077=77, a078=78, a079=79, a080=80,
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... a081=81, a082=82, a083=83, a084=84, a085=85, a086=86, a087=87, a088=88,
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... a089=89, a090=90, a091=91, a092=92, a093=93, a094=94, a095=95, a096=96,
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... a097=97, a098=98, a099=99, a100=100, a101=101, a102=102, a103=103,
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... a104=104, a105=105, a106=106, a107=107, a108=108, a109=109, a110=110,
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... a111=111, a112=112, a113=113, a114=114, a115=115, a116=116, a117=117,
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... a118=118, a119=119, a120=120, a121=121, a122=122, a123=123, a124=124,
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... a125=125, a126=126, a127=127, a128=128, a129=129, a130=130, a131=131,
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... a132=132, a133=133, a134=134, a135=135, a136=136, a137=137, a138=138,
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... a139=139, a140=140, a141=141, a142=142, a143=143, a144=144, a145=145,
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... a146=146, a147=147, a148=148, a149=149, a150=150, a151=151, a152=152,
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... a153=153, a154=154, a155=155, a156=156, a157=157, a158=158, a159=159,
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... a160=160, a161=161, a162=162, a163=163, a164=164, a165=165, a166=166,
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... a167=167, a168=168, a169=169, a170=170, a171=171, a172=172, a173=173,
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... a174=174, a175=175, a176=176, a177=177, a178=178, a179=179, a180=180,
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... a181=181, a182=182, a183=183, a184=184, a185=185, a186=186, a187=187,
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... a188=188, a189=189, a190=190, a191=191, a192=192, a193=193, a194=194,
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... a195=195, a196=196, a197=197, a198=198, a199=199, a200=200, a201=201,
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... a202=202, a203=203, a204=204, a205=205, a206=206, a207=207, a208=208,
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... a209=209, a210=210, a211=211, a212=212, a213=213, a214=214, a215=215,
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... a216=216, a217=217, a218=218, a219=219, a220=220, a221=221, a222=222,
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... a223=223, a224=224, a225=225, a226=226, a227=227, a228=228, a229=229,
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... a230=230, a231=231, a232=232, a233=233, a234=234, a235=235, a236=236,
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... a237=237, a238=238, a239=239, a240=240, a241=241, a242=242, a243=243,
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... a244=244, a245=245, a246=246, a247=247, a248=248, a249=249, a250=250,
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... a251=251, a252=252, a253=253, a254=254, a255=255, a256=256, a257=257,
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... a258=258, a259=259, a260=260, a261=261, a262=262, a263=263, a264=264,
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... a265=265, a266=266, a267=267, a268=268, a269=269, a270=270, a271=271,
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... a272=272, a273=273, a274=274, a275=275, a276=276, a277=277, a278=278,
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... a279=279, a280=280, a281=281, a282=282, a283=283, a284=284, a285=285,
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... a286=286, a287=287, a288=288, a289=289, a290=290, a291=291, a292=292,
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... a293=293, a294=294, a295=295, a296=296, a297=297, a298=298, a299=299)
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... # doctest: +ELLIPSIS
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() [('a000', 0), ('a001', 1), ('a002', 2), ..., ('a298', 298), ('a299', 299)]
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>>> class C:
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... def meth(self, *args):
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... return args
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>>> obj = C()
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>>> obj.meth(
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... 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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... 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
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... 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
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... 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
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... 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
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... 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
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... 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
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... 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
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... 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
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... 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
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... 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
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... 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
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... 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
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... 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
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... 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
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... 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
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... 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
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... 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
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... 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)
|
|
# Traceback (most recent call last):
|
|
# SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
|
|
|
|
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
|
|
>>> 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__
|
|
|
|
|
|
More set_context():
|
|
|
|
>>> (x for x in x) += 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: 'generator expression' is an illegal expression for augmented assignment
|
|
>>> None += 1
|
|
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
|
|
Traceback (most recent call last):
|
|
SyntaxError: 'function call' is an illegal expression for augmented assignment
|
|
|
|
|
|
Test continue in finally in weird combinations.
|
|
|
|
continue in for loop under finally should be ok.
|
|
|
|
>>> def test():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... for abc in range(10):
|
|
... continue
|
|
... print(abc)
|
|
>>> test()
|
|
9
|
|
|
|
continue in a finally should be ok.
|
|
|
|
>>> def test():
|
|
... for abc in range(10):
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... continue
|
|
... print(abc)
|
|
>>> test()
|
|
9
|
|
|
|
>>> def test():
|
|
... for abc in range(10):
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... try:
|
|
... continue
|
|
... except:
|
|
... pass
|
|
... print(abc)
|
|
>>> test()
|
|
9
|
|
|
|
>>> def test():
|
|
... for abc in range(10):
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... try:
|
|
... pass
|
|
... except:
|
|
... continue
|
|
... print(abc)
|
|
>>> test()
|
|
9
|
|
|
|
A continue outside loop should not be allowed.
|
|
|
|
>>> def foo():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... continue
|
|
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
|
|
|
|
This raises a SyntaxError, it used to raise a SystemError.
|
|
Context for this change can be found on issue #27514
|
|
|
|
In 2.5 there was a missing exception and an assert was triggered in a debug
|
|
build. The number of blocks must be greater than CO_MAXBLOCKS. SF #1565514
|
|
|
|
>>> while 1:
|
|
... while 2:
|
|
... while 3:
|
|
... while 4:
|
|
... while 5:
|
|
... while 6:
|
|
... while 8:
|
|
... while 9:
|
|
... while 10:
|
|
... while 11:
|
|
... while 12:
|
|
... while 13:
|
|
... while 14:
|
|
... while 15:
|
|
... while 16:
|
|
... while 17:
|
|
... while 18:
|
|
... while 19:
|
|
... while 20:
|
|
... while 21:
|
|
... while 22:
|
|
... break
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: too many statically nested blocks
|
|
|
|
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
|
|
|
|
>>> def f():
|
|
... x = 1
|
|
... def g():
|
|
... x = 2
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: name 'x' is assigned to before nonlocal declaration
|
|
|
|
>>> def f(x):
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: name 'x' is parameter and nonlocal
|
|
|
|
>>> def f():
|
|
... global x
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: name 'x' is nonlocal and global
|
|
|
|
>>> def f():
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: no binding for nonlocal 'x' found
|
|
|
|
From SF bug #1705365
|
|
>>> nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: nonlocal declaration not allowed at module level
|
|
|
|
From https://bugs.python.org/issue25973
|
|
>>> class A:
|
|
... def f(self):
|
|
... nonlocal __x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: no binding for nonlocal '_A__x' found
|
|
|
|
|
|
This tests assignment-context; there was a bug in Python 2.5 where compiling
|
|
a complex 'if' (one with 'elif') would fail to notice an invalid suite,
|
|
leading to spurious errors.
|
|
|
|
>>> if 1:
|
|
... x() = 1
|
|
... elif 1:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: cannot assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... x() = 1
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: cannot assign to function call
|
|
|
|
>>> if 1:
|
|
... x() = 1
|
|
... elif 1:
|
|
... pass
|
|
... else:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: cannot assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... x() = 1
|
|
... else:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: cannot assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... pass
|
|
... else:
|
|
... x() = 1
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: cannot assign to function call
|
|
|
|
Make sure that the old "raise X, Y[, Z]" form is gone:
|
|
>>> raise X, Y
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: invalid syntax
|
|
>>> raise X, Y, Z
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: invalid syntax
|
|
|
|
|
|
>>> f(a=23, a=234)
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: keyword argument repeated: a
|
|
|
|
>>> {1, 2, 3} = 42
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to set display
|
|
|
|
>>> {1: 2, 3: 4} = 42
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to dict display
|
|
|
|
>>> f'{x}' = 42
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to f-string expression
|
|
|
|
>>> f'{x}-{y}' = 42
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to f-string expression
|
|
|
|
>>> from t import x,
|
|
Traceback (most recent call last):
|
|
SyntaxError: trailing comma not allowed without surrounding parentheses
|
|
|
|
>>> from t import x,y,
|
|
Traceback (most recent call last):
|
|
SyntaxError: trailing comma not allowed without surrounding parentheses
|
|
|
|
>>> (): int
|
|
Traceback (most recent call last):
|
|
SyntaxError: only single target (not tuple) can be annotated
|
|
>>> []: int
|
|
Traceback (most recent call last):
|
|
SyntaxError: only single target (not list) can be annotated
|
|
>>> (()): int
|
|
Traceback (most recent call last):
|
|
SyntaxError: only single target (not tuple) can be annotated
|
|
>>> ([]): int
|
|
Traceback (most recent call last):
|
|
SyntaxError: only single target (not list) can be annotated
|
|
|
|
Corner-cases that used to fail to raise the correct error:
|
|
|
|
>>> def f(*, x=lambda __debug__:0): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to __debug__
|
|
|
|
>>> with (lambda *:0): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: named arguments must follow bare *
|
|
|
|
Corner-cases that used to crash:
|
|
|
|
>>> def f(**__debug__): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to __debug__
|
|
|
|
>>> def f(*xx, __debug__): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: cannot assign to __debug__
|
|
|
|
>>> import ä £
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid character '£' (U+00A3)
|
|
"""
|
|
|
|
import re
|
|
import unittest
|
|
|
|
from test import support
|
|
|
|
class SyntaxTestCase(unittest.TestCase):
|
|
|
|
def _check_error(self, code, errtext,
|
|
filename="<testcase>", mode="exec", subclass=None, lineno=None, offset=None):
|
|
"""Check that compiling code raises SyntaxError with errtext.
|
|
|
|
errtest is a regular expression that must be present in the
|
|
test of the exception raised. If subclass is specified it
|
|
is the expected subclass of SyntaxError (e.g. IndentationError).
|
|
"""
|
|
try:
|
|
compile(code, filename, mode)
|
|
except SyntaxError as err:
|
|
if subclass and not isinstance(err, subclass):
|
|
self.fail("SyntaxError is not a %s" % subclass.__name__)
|
|
mo = re.search(errtext, str(err))
|
|
if mo is None:
|
|
self.fail("SyntaxError did not contain %r" % (errtext,))
|
|
self.assertEqual(err.filename, filename)
|
|
if lineno is not None:
|
|
self.assertEqual(err.lineno, lineno)
|
|
if offset is not None:
|
|
self.assertEqual(err.offset, offset)
|
|
else:
|
|
self.fail("compile() did not raise SyntaxError")
|
|
|
|
def test_curly_brace_after_primary_raises_immediately(self):
|
|
self._check_error("f{", "invalid syntax", mode="single")
|
|
|
|
def test_assign_call(self):
|
|
self._check_error("f() = 1", "assign")
|
|
|
|
def test_assign_del(self):
|
|
self._check_error("del (,)", "invalid syntax")
|
|
self._check_error("del 1", "delete literal")
|
|
self._check_error("del (1, 2)", "delete literal")
|
|
self._check_error("del None", "delete None")
|
|
self._check_error("del *x", "delete starred")
|
|
self._check_error("del (*x)", "use starred expression")
|
|
self._check_error("del (*x,)", "delete starred")
|
|
self._check_error("del [*x,]", "delete starred")
|
|
self._check_error("del f()", "delete function call")
|
|
self._check_error("del f(a, b)", "delete function call")
|
|
self._check_error("del o.f()", "delete function call")
|
|
self._check_error("del a[0]()", "delete function call")
|
|
self._check_error("del x, f()", "delete function call")
|
|
self._check_error("del f(), x", "delete function call")
|
|
self._check_error("del [a, b, ((c), (d,), e.f())]", "delete function call")
|
|
self._check_error("del (a if True else b)", "delete conditional")
|
|
self._check_error("del +a", "delete operator")
|
|
self._check_error("del a, +b", "delete operator")
|
|
self._check_error("del a + b", "delete operator")
|
|
self._check_error("del (a + b, c)", "delete operator")
|
|
self._check_error("del (c[0], a + b)", "delete operator")
|
|
self._check_error("del a.b.c + 2", "delete operator")
|
|
self._check_error("del a.b.c[0] + 2", "delete operator")
|
|
self._check_error("del (a, b, (c, d.e.f + 2))", "delete operator")
|
|
self._check_error("del [a, b, (c, d.e.f[0] + 2)]", "delete operator")
|
|
self._check_error("del (a := 5)", "delete named expression")
|
|
# We don't have a special message for this, but make sure we don't
|
|
# report "cannot delete name"
|
|
self._check_error("del a += b", "invalid syntax")
|
|
|
|
def test_global_param_err_first(self):
|
|
source = """if 1:
|
|
def error(a):
|
|
global a # SyntaxError
|
|
def error2():
|
|
b = 1
|
|
global b # SyntaxError
|
|
"""
|
|
self._check_error(source, "parameter and global", lineno=3)
|
|
|
|
def test_nonlocal_param_err_first(self):
|
|
source = """if 1:
|
|
def error(a):
|
|
nonlocal a # SyntaxError
|
|
def error2():
|
|
b = 1
|
|
global b # SyntaxError
|
|
"""
|
|
self._check_error(source, "parameter and nonlocal", lineno=3)
|
|
|
|
def test_break_outside_loop(self):
|
|
self._check_error("break", "outside loop")
|
|
|
|
def test_yield_outside_function(self):
|
|
self._check_error("if 0: yield", "outside function")
|
|
self._check_error("if 0: yield\nelse: x=1", "outside function")
|
|
self._check_error("if 1: pass\nelse: yield", "outside function")
|
|
self._check_error("while 0: yield", "outside function")
|
|
self._check_error("while 0: yield\nelse: x=1", "outside function")
|
|
self._check_error("class C:\n if 0: yield", "outside function")
|
|
self._check_error("class C:\n if 1: pass\n else: yield",
|
|
"outside function")
|
|
self._check_error("class C:\n while 0: yield", "outside function")
|
|
self._check_error("class C:\n while 0: yield\n else: x = 1",
|
|
"outside function")
|
|
|
|
def test_return_outside_function(self):
|
|
self._check_error("if 0: return", "outside function")
|
|
self._check_error("if 0: return\nelse: x=1", "outside function")
|
|
self._check_error("if 1: pass\nelse: return", "outside function")
|
|
self._check_error("while 0: return", "outside function")
|
|
self._check_error("class C:\n if 0: return", "outside function")
|
|
self._check_error("class C:\n while 0: return", "outside function")
|
|
self._check_error("class C:\n while 0: return\n else: x=1",
|
|
"outside function")
|
|
self._check_error("class C:\n if 0: return\n else: x= 1",
|
|
"outside function")
|
|
self._check_error("class C:\n if 1: pass\n else: return",
|
|
"outside function")
|
|
|
|
def test_break_outside_loop(self):
|
|
self._check_error("if 0: break", "outside loop")
|
|
self._check_error("if 0: break\nelse: x=1", "outside loop")
|
|
self._check_error("if 1: pass\nelse: break", "outside loop")
|
|
self._check_error("class C:\n if 0: break", "outside loop")
|
|
self._check_error("class C:\n if 1: pass\n else: break",
|
|
"outside loop")
|
|
|
|
def test_continue_outside_loop(self):
|
|
self._check_error("if 0: continue", "not properly in loop")
|
|
self._check_error("if 0: continue\nelse: x=1", "not properly in loop")
|
|
self._check_error("if 1: pass\nelse: continue", "not properly in loop")
|
|
self._check_error("class C:\n if 0: continue", "not properly in loop")
|
|
self._check_error("class C:\n if 1: pass\n else: continue",
|
|
"not properly in loop")
|
|
|
|
def test_unexpected_indent(self):
|
|
self._check_error("foo()\n bar()\n", "unexpected indent",
|
|
subclass=IndentationError)
|
|
|
|
def test_no_indent(self):
|
|
self._check_error("if 1:\nfoo()", "expected an indented block",
|
|
subclass=IndentationError)
|
|
|
|
def test_bad_outdent(self):
|
|
self._check_error("if 1:\n foo()\n bar()",
|
|
"unindent does not match .* level",
|
|
subclass=IndentationError)
|
|
|
|
def test_kwargs_last(self):
|
|
self._check_error("int(base=10, '2')",
|
|
"positional argument follows keyword argument")
|
|
|
|
def test_kwargs_last2(self):
|
|
self._check_error("int(**{'base': 10}, '2')",
|
|
"positional argument follows "
|
|
"keyword argument unpacking")
|
|
|
|
def test_kwargs_last3(self):
|
|
self._check_error("int(**{'base': 10}, *['2'])",
|
|
"iterable argument unpacking follows "
|
|
"keyword argument unpacking")
|
|
|
|
def test_empty_line_after_linecont(self):
|
|
# See issue-40847
|
|
s = r"""\
|
|
pass
|
|
\
|
|
|
|
pass
|
|
"""
|
|
try:
|
|
compile(s, '<string>', 'exec')
|
|
except SyntaxError:
|
|
self.fail("Empty line after a line continuation character is valid.")
|
|
|
|
@support.cpython_only
|
|
def test_nested_named_except_blocks(self):
|
|
code = ""
|
|
for i in range(12):
|
|
code += f"{' '*i}try:\n"
|
|
code += f"{' '*(i+1)}raise Exception\n"
|
|
code += f"{' '*i}except Exception as e:\n"
|
|
code += f"{' '*4*12}pass"
|
|
self._check_error(code, "too many statically nested blocks")
|
|
|
|
def test_barry_as_flufl_with_syntax_errors(self):
|
|
# The "barry_as_flufl" rule can produce some "bugs-at-a-distance" if
|
|
# is reading the wrong token in the presence of syntax errors later
|
|
# in the file. See bpo-42214 for more information.
|
|
code = """
|
|
def func1():
|
|
if a != b:
|
|
raise ValueError
|
|
|
|
def func2():
|
|
try
|
|
return 1
|
|
finally:
|
|
pass
|
|
"""
|
|
self._check_error(code, "invalid syntax")
|
|
|
|
def test_invalid_line_continuation_left_recursive(self):
|
|
# Check bpo-42218: SyntaxErrors following left-recursive rules
|
|
# (t_primary_raw in this case) need to be tested explicitly
|
|
self._check_error("A.\u018a\\ ",
|
|
"unexpected character after line continuation character")
|
|
self._check_error("A.\u03bc\\\n",
|
|
"unexpected EOF while parsing")
|
|
|
|
def test_main():
|
|
support.run_unittest(SyntaxTestCase)
|
|
from test import test_syntax
|
|
support.run_doctest(test_syntax, verbosity=True)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|