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-rw-r--r--Lib/test/test_syntax.py201
1 files changed, 111 insertions, 90 deletions
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index 7994fe67e72..5926b69c93b 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -5,7 +5,7 @@ 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 local and global (<doctest test.test_syntax[0]>, line 1)
+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
@@ -29,13 +29,11 @@ Errors from set_context():
>>> obj.None = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[1]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
>>> None = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[2]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: assignment to keyword
It's a syntax error to assign to the empty tuple. Why isn't it an
error to assign to the empty list? It will always raise some error at
@@ -43,43 +41,39 @@ runtime.
>>> () = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[3]>", line 1
SyntaxError: can't assign to ()
>>> f() = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[4]>", line 1
SyntaxError: can't assign to function call
>>> del f()
Traceback (most recent call last):
- File "<doctest test.test_syntax[5]>", line 1
SyntaxError: can't delete function call
>>> a + 1 = 2
Traceback (most recent call last):
- File "<doctest test.test_syntax[6]>", line 1
SyntaxError: can't assign to operator
>>> (x for x in x) = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[7]>", line 1
SyntaxError: can't assign to generator expression
>>> 1 = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[8]>", line 1
SyntaxError: can't assign to literal
>>> "abc" = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[8]>", line 1
+SyntaxError: can't assign to literal
+
+>>> b"" = 1
+Traceback (most recent call last):
SyntaxError: can't assign to literal
>>> `1` = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[10]>", line 1
-SyntaxError: can't assign to repr
+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.
@@ -88,17 +82,14 @@ them.
>>> (a, "b", c) = (1, 2, 3)
Traceback (most recent call last):
- File "<doctest test.test_syntax[11]>", line 1
SyntaxError: can't assign to literal
>>> [a, b, c + 1] = [1, 2, 3]
Traceback (most recent call last):
- File "<doctest test.test_syntax[12]>", line 1
SyntaxError: can't assign to operator
>>> a if 1 else b = 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[13]>", line 1
SyntaxError: can't assign to conditional expression
From compiler_complex_args():
@@ -106,8 +97,7 @@ From compiler_complex_args():
>>> def f(None=1):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[14]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
From ast_for_arguments():
@@ -115,26 +105,22 @@ From ast_for_arguments():
>>> def f(x, y=1, z):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[15]>", line 1
SyntaxError: non-default argument follows default argument
>>> def f(x, None):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[16]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
>>> def f(*None):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[17]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
>>> def f(**None):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[18]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
From ast_for_funcdef():
@@ -142,8 +128,7 @@ From ast_for_funcdef():
>>> def None(x):
... pass
Traceback (most recent call last):
- File "<doctest test.test_syntax[19]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: invalid syntax
From ast_for_call():
@@ -155,7 +140,6 @@ From ast_for_call():
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> f(x for x in L, 1)
Traceback (most recent call last):
- File "<doctest test.test_syntax[23]>", line 1
SyntaxError: Generator expression must be parenthesized if not sole argument
>>> f((x for x in L), 1)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
@@ -188,7 +172,6 @@ SyntaxError: Generator expression must be parenthesized if not sole argument
... i244, i245, i246, i247, i248, i249, i250, i251, i252,
... i253, i254, i255)
Traceback (most recent call last):
- File "<doctest test.test_syntax[25]>", line 1
SyntaxError: more than 255 arguments
The actual error cases counts positional arguments, keyword arguments,
@@ -223,12 +206,10 @@ three.
... (x for x in i244), i245, i246, i247, i248, i249, i250, i251,
... i252=1, i253=1, i254=1, i255=1)
Traceback (most recent call last):
- File "<doctest test.test_syntax[26]>", line 1
SyntaxError: more than 255 arguments
>>> f(lambda x: x[0] = 3)
Traceback (most recent call last):
- File "<doctest test.test_syntax[27]>", line 1
SyntaxError: lambda cannot contain assignment
The grammar accepts any test (basically, any expression) in the
@@ -236,15 +217,12 @@ keyword slot of a call site. Test a few different options.
>>> f(x()=2)
Traceback (most recent call last):
- File "<doctest test.test_syntax[28]>", line 1
SyntaxError: keyword can't be an expression
>>> f(a or b=1)
Traceback (most recent call last):
- File "<doctest test.test_syntax[29]>", line 1
SyntaxError: keyword can't be an expression
>>> f(x.y=1)
Traceback (most recent call last):
- File "<doctest test.test_syntax[30]>", line 1
SyntaxError: keyword can't be an expression
@@ -252,15 +230,12 @@ More set_context():
>>> (x for x in x) += 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[31]>", line 1
SyntaxError: can't assign to generator expression
>>> None += 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[32]>", line 1
-SyntaxError: cannot assign to None
+SyntaxError: assignment to keyword
>>> f() += 1
Traceback (most recent call last):
- File "<doctest test.test_syntax[33]>", line 1
SyntaxError: can't assign to function call
@@ -274,7 +249,7 @@ continue in for loop under finally should be ok.
... finally:
... for abc in range(10):
... continue
- ... print abc
+ ... print(abc)
>>> test()
9
@@ -288,7 +263,6 @@ Start simple, a continue in a finally should not be allowed.
... continue
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[36]>", line 6
SyntaxError: 'continue' not supported inside 'finally' clause
This is essentially a continue in a finally which should not be allowed.
@@ -304,7 +278,6 @@ This is essentially a continue in a finally which should not be allowed.
... pass
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[37]>", line 6
SyntaxError: 'continue' not supported inside 'finally' clause
>>> def foo():
@@ -314,7 +287,6 @@ This is essentially a continue in a finally which should not be allowed.
... continue
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[38]>", line 5
SyntaxError: 'continue' not supported inside 'finally' clause
>>> def foo():
@@ -325,7 +297,6 @@ This is essentially a continue in a finally which should not be allowed.
... continue
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[39]>", line 6
SyntaxError: 'continue' not supported inside 'finally' clause
>>> def foo():
@@ -339,7 +310,6 @@ This is essentially a continue in a finally which should not be allowed.
... pass
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[40]>", line 7
SyntaxError: 'continue' not supported inside 'finally' clause
>>> def foo():
@@ -352,7 +322,6 @@ This is essentially a continue in a finally which should not be allowed.
... continue
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[41]>", line 8
SyntaxError: 'continue' not supported inside 'finally' clause
There is one test for a break that is not in a loop. The compiler
@@ -361,14 +330,13 @@ 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
+ ... print(1)
... break
- ... print 2
+ ... print(2)
... finally:
- ... print 3
+ ... print(3)
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[42]>", line 3
SyntaxError: 'break' outside loop
This should probably raise a better error than a SystemError (or none at all).
@@ -401,6 +369,51 @@ build. The number of blocks must be greater than CO_MAXBLOCKS. SF #1565514
...
SystemError: too many statically nested blocks
+Misuse of the nonlocal statement can lead to a few unique syntax errors.
+
+ >>> 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
+
+TODO(jhylton): Figure out how to test SyntaxWarning with doctest.
+
+## >>> def f(x):
+## ... def f():
+## ... print(x)
+## ... nonlocal x
+## Traceback (most recent call last):
+## ...
+## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
+
+## >>> def f():
+## ... x = 1
+## ... nonlocal x
+## Traceback (most recent call last):
+## ...
+## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
+
+
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.
@@ -411,7 +424,6 @@ leading to spurious errors.
... pass
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[44]>", line 2
SyntaxError: can't assign to function call
>>> if 1:
@@ -420,7 +432,6 @@ leading to spurious errors.
... x() = 1
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[45]>", line 4
SyntaxError: can't assign to function call
>>> if 1:
@@ -431,7 +442,6 @@ leading to spurious errors.
... pass
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[46]>", line 2
SyntaxError: can't assign to function call
>>> if 1:
@@ -442,7 +452,6 @@ leading to spurious errors.
... pass
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[47]>", line 4
SyntaxError: can't assign to function call
>>> if 1:
@@ -453,32 +462,59 @@ leading to spurious errors.
... x() = 1
Traceback (most recent call last):
...
- File "<doctest test.test_syntax[48]>", line 6
SyntaxError: can't 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):
...
- File "<doctest test.test_syntax[49]>", line 1
SyntaxError: keyword argument repeated
>>> del ()
Traceback (most recent call last):
- ...
- File "<doctest test.test_syntax[50]>", line 1
SyntaxError: can't delete ()
>>> {1, 2, 3} = 42
Traceback (most recent call last):
- ...
- File "<doctest test.test_syntax[50]>", line 1
SyntaxError: can't assign to literal
-Corner-case that used to crash:
+Corner-cases that used to fail to raise the correct error:
+
+ >>> def f(*, x=lambda __debug__:0): pass
+ Traceback (most recent call last):
+ SyntaxError: assignment to keyword
+
+ >>> def f(*args:(lambda __debug__:0)): pass
+ Traceback (most recent call last):
+ SyntaxError: assignment to keyword
+
+ >>> def f(**kwargs:(lambda __debug__:0)): pass
+ Traceback (most recent call last):
+ SyntaxError: assignment to keyword
+
+ >>> with (lambda *:0): pass
+ Traceback (most recent call last):
+ SyntaxError: named arguments must follow bare *
- >>> def f(*xx, **__debug__): pass
+Corner-cases that used to crash:
+
+ >>> def f(**__debug__): pass
+ Traceback (most recent call last):
+ SyntaxError: assignment to keyword
+
+ >>> def f(*xx, __debug__): pass
Traceback (most recent call last):
- SyntaxError: cannot assign to __debug__
+ SyntaxError: assignment to keyword
"""
@@ -486,7 +522,7 @@ import re
import unittest
import warnings
-from test import test_support
+from test import support
class SyntaxTestCase(unittest.TestCase):
@@ -500,19 +536,15 @@ class SyntaxTestCase(unittest.TestCase):
"""
try:
compile(code, filename, mode)
- except SyntaxError, err:
+ 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("%s did not contain '%r'" % (err, errtext,))
+ self.fail("SyntaxError did not contain '%r'" % (errtext,))
else:
self.fail("compile() did not raise SyntaxError")
- def test_paren_arg_with_default(self):
- self._check_error("def f((x)=23): pass",
- "parenthesized arg with default")
-
def test_assign_call(self):
self._check_error("f() = 1", "assign")
@@ -522,13 +554,13 @@ class SyntaxTestCase(unittest.TestCase):
def test_global_err_then_warn(self):
# Bug tickler: The SyntaxError raised for one global statement
# shouldn't be clobbered by a SyntaxWarning issued for a later one.
- source = re.sub('(?m)^ *:', '', """\
- :def error(a):
- : global a # SyntaxError
- :def warning():
- : b = 1
- : global b # SyntaxWarning
- :""")
+ source = """if 1:
+ def error(a):
+ global a # SyntaxError
+ def warning():
+ b = 1
+ global b # SyntaxWarning
+ """
warnings.filterwarnings(action='ignore', category=SyntaxWarning)
self._check_error(source, "global")
warnings.filters.pop(0)
@@ -536,15 +568,6 @@ class SyntaxTestCase(unittest.TestCase):
def test_break_outside_loop(self):
self._check_error("break", "outside loop")
- def test_delete_deref(self):
- source = re.sub('(?m)^ *:', '', """\
- :def foo(x):
- : def bar():
- : print x
- : del x
- :""")
- self._check_error(source, "nested scope")
-
def test_unexpected_indent(self):
self._check_error("foo()\n bar()\n", "unexpected indent",
subclass=IndentationError)
@@ -562,11 +585,9 @@ class SyntaxTestCase(unittest.TestCase):
self._check_error("int(base=10, '2')", "non-keyword arg")
def test_main():
- test_support.run_unittest(SyntaxTestCase)
+ support.run_unittest(SyntaxTestCase)
from test import test_syntax
- with test_support.check_py3k_warnings(("backquote not supported",
- SyntaxWarning)):
- test_support.run_doctest(test_syntax, verbosity=True)
+ support.run_doctest(test_syntax, verbosity=True)
if __name__ == "__main__":
test_main()
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-14 09:35:00 +0000