import sys
import unittest
import textwrap
from test.support.testcase import ExceptionIsLikeMixin
class TestInvalidExceptStar(unittest.TestCase):
def test_mixed_except_and_except_star_is_syntax_error(self):
errors = [
"try: pass\nexcept ValueError: pass\nexcept* TypeError: pass\n",
"try: pass\nexcept* ValueError: pass\nexcept TypeError: pass\n",
"try: pass\nexcept ValueError as e: pass\nexcept* TypeError: pass\n",
"try: pass\nexcept* ValueError as e: pass\nexcept TypeError: pass\n",
"try: pass\nexcept ValueError: pass\nexcept* TypeError as e: pass\n",
"try: pass\nexcept* ValueError: pass\nexcept TypeError as e: pass\n",
"try: pass\nexcept ValueError: pass\nexcept*: pass\n",
"try: pass\nexcept* ValueError: pass\nexcept: pass\n",
]
for err in errors:
with self.assertRaises(SyntaxError):
compile(err, "<string>", "exec")
def test_except_star_ExceptionGroup_is_runtime_error_single(self):
with self.assertRaises(TypeError):
try:
raise OSError("blah")
except* ExceptionGroup as e:
pass
def test_except_star_ExceptionGroup_is_runtime_error_tuple(self):
with self.assertRaises(TypeError):
try:
raise ExceptionGroup("eg", [ValueError(42)])
except* (TypeError, ExceptionGroup):
pass
def test_except_star_invalid_exception_type(self):
with self.assertRaises(TypeError):
try:
raise ValueError
except* 42:
pass
with self.assertRaises(TypeError):
try:
raise ValueError
except* (ValueError, 42):
pass
class TestBreakContinueReturnInExceptStarBlock(unittest.TestCase):
MSG = (r"'break', 'continue' and 'return'"
r" cannot appear in an except\* block")
def check_invalid(self, src):
with self.assertRaisesRegex(SyntaxError, self.MSG):
compile(textwrap.dedent(src), "<string>", "exec")
def test_break_in_except_star(self):
self.check_invalid(
"""
try:
raise ValueError
except* Exception as e:
break
""")
self.check_invalid(
"""
for i in range(5):
try:
pass
except* Exception as e:
if i == 2:
break
""")
self.check_invalid(
"""
for i in range(5):
try:
pass
except* Exception as e:
if i == 2:
break
finally:
return 0
""")
def test_continue_in_except_star_block_invalid(self):
self.check_invalid(
"""
for i in range(5):
try:
raise ValueError
except* Exception as e:
continue
""")
self.check_invalid(
"""
for i in range(5):
try:
pass
except* Exception as e:
if i == 2:
continue
""")
self.check_invalid(
"""
for i in range(5):
try:
pass
except* Exception as e:
if i == 2:
continue
finally:
return 0
""")
def test_return_in_except_star_block_invalid(self):
self.check_invalid(
"""
def f():
try:
raise ValueError
except* Exception as e:
return 42
""")
self.check_invalid(
"""
def f():
try:
pass
except* Exception as e:
return 42
finally:
finished = True
""")
def test_break_continue_in_except_star_block_valid(self):
try:
raise ValueError(42)
except* Exception as e:
count = 0
for i in range(5):
if i == 0:
continue
if i == 4:
break
count += 1
self.assertEqual(count, 3)
self.assertEqual(i, 4)
exc = e
self.assertIsInstance(exc, ExceptionGroup)
def test_return_in_except_star_block_valid(self):
try:
raise ValueError(42)
except* Exception as e:
def f(x):
return 2*x
r = f(3)
exc = e
self.assertEqual(r, 6)
self.assertIsInstance(exc, ExceptionGroup)
class ExceptStarTest(ExceptionIsLikeMixin, unittest.TestCase):
def assertMetadataEqual(self, e1, e2):
if e1 is None or e2 is None:
self.assertTrue(e1 is None and e2 is None)
else:
self.assertEqual(e1.__context__, e2.__context__)
self.assertEqual(e1.__cause__, e2.__cause__)
self.assertEqual(e1.__traceback__, e2.__traceback__)
def assertMetadataNotEqual(self, e1, e2):
if e1 is None or e2 is None:
self.assertNotEqual(e1, e2)
else:
return not (e1.__context__ == e2.__context__
and e1.__cause__ == e2.__cause__
and e1.__traceback__ == e2.__traceback__)
class TestExceptStarSplitSemantics(ExceptStarTest):
def doSplitTestNamed(self, exc, T, match_template, rest_template):
initial_sys_exception = sys.exception()
sys_exception = match = rest = None
try:
try:
raise exc
except* T as e:
sys_exception = sys.exception()
match = e
except BaseException as e:
rest = e
self.assertEqual(sys_exception, match)
self.assertExceptionIsLike(match, match_template)
self.assertExceptionIsLike(rest, rest_template)
self.assertEqual(sys.exception(), initial_sys_exception)
def doSplitTestUnnamed(self, exc, T, match_template, rest_template):
initial_sys_exception = sys.exception()
sys_exception = match = rest = None
try:
try:
raise exc
except* T:
sys_exception = match = sys.exception()
else:
if rest_template:
self.fail("Exception not raised")
except BaseException as e:
rest = e
self.assertExceptionIsLike(match, match_template)
self.assertExceptionIsLike(rest, rest_template)
self.assertEqual(sys.exception(), initial_sys_exception)
def doSplitTestInExceptHandler(self, exc, T, match_template, rest_template):
try:
raise ExceptionGroup('eg', [TypeError(1), ValueError(2)])
except Exception:
self.doSplitTestNamed(exc, T, match_template, rest_template)
self.doSplitTestUnnamed(exc, T, match_template, rest_template)
def doSplitTestInExceptStarHandler(self, exc, T, match_template, rest_template):
try:
raise ExceptionGroup('eg', [TypeError(1), ValueError(2)])
except* Exception:
self.doSplitTestNamed(exc, T, match_template, rest_template)
self.doSplitTestUnnamed(exc, T, match_template, rest_template)
def doSplitTest(self, exc, T, match_template, rest_template):
self.doSplitTestNamed(exc, T, match_template, rest_template)
self.doSplitTestUnnamed(exc, T, match_template, rest_template)
self.doSplitTestInExceptHandler(exc, T, match_template, rest_template)
self.doSplitTestInExceptStarHandler(exc, T, match_template, rest_template)
def test_no_match_single_type(self):
self.doSplitTest(
ExceptionGroup("test1", [ValueError("V"), TypeError("T")]),
SyntaxError,
None,
ExceptionGroup("test1", [ValueError("V"), TypeError("T")]))
def test_match_single_type(self):
self.doSplitTest(
ExceptionGroup("test2", [ValueError("V1"), ValueError("V2")]),
ValueError,
ExceptionGroup("test2", [ValueError("V1"), ValueError("V2")]),
None)
def test_match_single_type_partial_match(self):
self.doSplitTest(
ExceptionGroup(
"test3",
[ValueError("V1"), OSError("OS"), ValueError("V2")]),
ValueError,
ExceptionGroup("test3", [ValueError("V1"), ValueError("V2")]),
ExceptionGroup("test3", [OSError("OS")]))
def test_match_single_type_nested(self):
self.doSplitTest(
ExceptionGroup(
"g1", [
ValueError("V1"),
OSError("OS1"),
ExceptionGroup(
"g2", [
OSError("OS2"),
ValueError("V2"),
TypeError("T")])]),
ValueError,
ExceptionGroup(
"g1", [
ValueError("V1"),
ExceptionGroup("g2", [ValueError("V2")])]),
ExceptionGroup("g1", [
OSError("OS1"),
ExceptionGroup("g2", [
OSError("OS2"), TypeError("T")])]))
def test_match_type_tuple_nested(self):
self.doSplitTest(
ExceptionGroup(
"h1", [
ValueError("V1"),
OSError("OS1"),
ExceptionGroup(
"h2", [OSError("OS2"), ValueError("V2"), TypeError("T")])]),
(ValueError, TypeError),
ExceptionGroup(
"h1", [
ValueError("V1"),
ExceptionGroup("h2", [ValueError("V2"), TypeError("T")])]),
ExceptionGroup(
"h1", [
OSError("OS1"),
ExceptionGroup("h2", [OSError("OS2")])]))
def test_empty_groups_removed(self):
self.doSplitTest(
ExceptionGroup(
"eg", [
ExceptionGroup("i1", [ValueError("V1")]),
ExceptionGroup("i2", [ValueError("V2"), TypeError("T1")]),
ExceptionGroup("i3", [TypeError("T2")])]),
TypeError,
ExceptionGroup("eg", [
ExceptionGroup("i2", [TypeError("T1")]),
ExceptionGroup("i3", [TypeError("T2")])]),
ExceptionGroup("eg", [
ExceptionGroup("i1", [ValueError("V1")]),
ExceptionGroup("i2", [ValueError("V2")])]))
def test_singleton_groups_are_kept(self):
self.doSplitTest(
ExceptionGroup("j1", [
ExceptionGroup("j2", [
ExceptionGroup("j3", [ValueError("V1")]),
ExceptionGroup("j4", [TypeError("T")])])]),
TypeError,
ExceptionGroup(
"j1",
[ExceptionGroup("j2", [ExceptionGroup("j4", [TypeError("T")])])]),
ExceptionGroup(
"j1",
[ExceptionGroup("j2", [ExceptionGroup("j3", [ValueError("V1")])])]))
def test_naked_exception_matched_wrapped1(self):
self.doSplitTest(
ValueError("V"),
ValueError,
ExceptionGroup("", [ValueError("V")]),
None)
def test_naked_exception_matched_wrapped2(self):
self.doSplitTest(
ValueError("V"),
Exception,
ExceptionGroup("", [ValueError("V")]),
None)
def test_exception_group_except_star_Exception_not_wrapped(self):
self.doSplitTest(
ExceptionGroup("eg", [ValueError("V")]),
Exception,
ExceptionGroup("eg", [ValueError("V")]),
None)
def test_plain_exception_not_matched(self):
self.doSplitTest(
ValueError("V"),
TypeError,
None,
ValueError("V"))
def test_match__supertype(self):
self.doSplitTest(
ExceptionGroup("st", [BlockingIOError("io"), TypeError("T")]),
OSError,
ExceptionGroup("st", [BlockingIOError("io")]),
ExceptionGroup("st", [TypeError("T")]))
def test_multiple_matches_named(self):
try:
raise ExceptionGroup("mmn", [OSError("os"), BlockingIOError("io")])
except* BlockingIOError as e:
self.assertExceptionIsLike(e,
ExceptionGroup("mmn", [BlockingIOError("io")]))
except* OSError as e:
self.assertExceptionIsLike(e,
ExceptionGroup("mmn", [OSError("os")]))
else:
self.fail("Exception not raised")
def test_multiple_matches_unnamed(self):
try:
raise ExceptionGroup("mmu", [OSError("os"), BlockingIOError("io")])
except* BlockingIOError:
e = sys.exception()
self.assertExceptionIsLike(e,
ExceptionGroup("mmu", [BlockingIOError("io")]))
except* OSError:
e = sys.exception()
self.assertExceptionIsLike(e,
ExceptionGroup("mmu", [OSError("os")]))
else:
self.fail("Exception not raised")
def test_first_match_wins_named(self):
try:
raise ExceptionGroup("fst", [BlockingIOError("io")])
except* OSError as e:
self.assertExceptionIsLike(e,
ExceptionGroup("fst", [BlockingIOError("io")]))
except* BlockingIOError:
self.fail("Should have been matched as OSError")
else:
self.fail("Exception not raised")
def test_first_match_wins_unnamed(self):
try:
raise ExceptionGroup("fstu", [BlockingIOError("io")])
except* OSError:
e = sys.exception()
self.assertExceptionIsLike(e,
ExceptionGroup("fstu", [BlockingIOError("io")]))
except* BlockingIOError:
pass
else:
self.fail("Exception not raised")
def test_nested_except_stars(self):
try:
raise ExceptionGroup("n", [BlockingIOError("io")])
except* BlockingIOError:
try:
raise ExceptionGroup("n", [ValueError("io")])
except* ValueError:
pass
else:
self.fail("Exception not raised")
e = sys.exception()
self.assertExceptionIsLike(e,
ExceptionGroup("n", [BlockingIOError("io")]))
else:
self.fail("Exception not raised")
def test_nested_in_loop(self):
for _ in range(2):
try:
raise ExceptionGroup("nl", [BlockingIOError("io")])
except* BlockingIOError:
pass
else:
self.fail("Exception not raised")
class TestExceptStarReraise(ExceptStarTest):
def test_reraise_all_named(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2), OSError(3)])
except* TypeError as e:
raise
except* ValueError as e:
raise
# OSError not handled
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup("eg", [TypeError(1), ValueError(2), OSError(3)]))
def test_reraise_all_unnamed(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2), OSError(3)])
except* TypeError:
raise
except* ValueError:
raise
# OSError not handled
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup("eg", [TypeError(1), ValueError(2), OSError(3)]))
def test_reraise_some_handle_all_named(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2), OSError(3)])
except* TypeError as e:
raise
except* ValueError as e:
pass
# OSError not handled
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("eg", [TypeError(1), OSError(3)]))
def test_reraise_partial_handle_all_unnamed(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2)])
except* TypeError:
raise
except* ValueError:
pass
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("eg", [TypeError(1)]))
def test_reraise_partial_handle_some_named(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2), OSError(3)])
except* TypeError as e:
raise
except* ValueError as e:
pass
# OSError not handled
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("eg", [TypeError(1), OSError(3)]))
def test_reraise_partial_handle_some_unnamed(self):
try:
try:
raise ExceptionGroup(
"eg", [TypeError(1), ValueError(2), OSError(3)])
except* TypeError:
raise
except* ValueError:
pass
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("eg", [TypeError(1), OSError(3)]))
def test_reraise_plain_exception_named(self):
try:
try:
raise ValueError(42)
except* ValueError as e:
raise
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [ValueError(42)]))
def test_reraise_plain_exception_unnamed(self):
try:
try:
raise ValueError(42)
except* ValueError:
raise
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [ValueError(42)]))
class TestExceptStarRaise(ExceptStarTest):
def test_raise_named(self):
orig = ExceptionGroup("eg", [ValueError(1), OSError(2)])
try:
try:
raise orig
except* OSError as e:
raise TypeError(3)
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup(
"", [TypeError(3), ExceptionGroup("eg", [ValueError(1)])]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [OSError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
def test_raise_unnamed(self):
orig = ExceptionGroup("eg", [ValueError(1), OSError(2)])
try:
try:
raise orig
except* OSError:
raise TypeError(3)
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup(
"", [TypeError(3), ExceptionGroup("eg", [ValueError(1)])]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [OSError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
def test_raise_handle_all_raise_one_named(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* (TypeError, ValueError) as e:
raise SyntaxError(3)
except SyntaxError as e:
exc = e
self.assertExceptionIsLike(exc, SyntaxError(3))
self.assertExceptionIsLike(
exc.__context__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.__context__)
def test_raise_handle_all_raise_one_unnamed(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* (TypeError, ValueError) as e:
raise SyntaxError(3)
except SyntaxError as e:
exc = e
self.assertExceptionIsLike(exc, SyntaxError(3))
self.assertExceptionIsLike(
exc.__context__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.__context__)
def test_raise_handle_all_raise_two_named(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* TypeError as e:
raise SyntaxError(3)
except* ValueError as e:
raise SyntaxError(4)
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [SyntaxError(3), SyntaxError(4)]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[1].__context__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[1].__context__)
def test_raise_handle_all_raise_two_unnamed(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* TypeError:
raise SyntaxError(3)
except* ValueError:
raise SyntaxError(4)
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [SyntaxError(3), SyntaxError(4)]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[1].__context__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[1].__context__)
class TestExceptStarRaiseFrom(ExceptStarTest):
def test_raise_named(self):
orig = ExceptionGroup("eg", [ValueError(1), OSError(2)])
try:
try:
raise orig
except* OSError as e:
raise TypeError(3) from e
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup(
"", [TypeError(3), ExceptionGroup("eg", [ValueError(1)])]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [OSError(2)]))
self.assertExceptionIsLike(
exc.exceptions[0].__cause__,
ExceptionGroup("eg", [OSError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[0].__cause__)
self.assertMetadataNotEqual(orig, exc.exceptions[1].__context__)
self.assertMetadataNotEqual(orig, exc.exceptions[1].__cause__)
def test_raise_unnamed(self):
orig = ExceptionGroup("eg", [ValueError(1), OSError(2)])
try:
try:
raise orig
except* OSError:
e = sys.exception()
raise TypeError(3) from e
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc,
ExceptionGroup(
"", [TypeError(3), ExceptionGroup("eg", [ValueError(1)])]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [OSError(2)]))
self.assertExceptionIsLike(
exc.exceptions[0].__cause__,
ExceptionGroup("eg", [OSError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[0].__cause__)
self.assertMetadataNotEqual(orig, exc.exceptions[1].__context__)
self.assertMetadataNotEqual(orig, exc.exceptions[1].__cause__)
def test_raise_handle_all_raise_one_named(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* (TypeError, ValueError) as e:
raise SyntaxError(3) from e
except SyntaxError as e:
exc = e
self.assertExceptionIsLike(exc, SyntaxError(3))
self.assertExceptionIsLike(
exc.__context__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertExceptionIsLike(
exc.__cause__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.__context__)
self.assertMetadataEqual(orig, exc.__cause__)
def test_raise_handle_all_raise_one_unnamed(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* (TypeError, ValueError) as e:
e = sys.exception()
raise SyntaxError(3) from e
except SyntaxError as e:
exc = e
self.assertExceptionIsLike(exc, SyntaxError(3))
self.assertExceptionIsLike(
exc.__context__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertExceptionIsLike(
exc.__cause__,
ExceptionGroup("eg", [TypeError(1), ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.__context__)
self.assertMetadataEqual(orig, exc.__cause__)
def test_raise_handle_all_raise_two_named(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* TypeError as e:
raise SyntaxError(3) from e
except* ValueError as e:
raise SyntaxError(4) from e
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [SyntaxError(3), SyntaxError(4)]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[0].__cause__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[1].__context__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertExceptionIsLike(
exc.exceptions[1].__cause__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[0].__cause__)
def test_raise_handle_all_raise_two_unnamed(self):
orig = ExceptionGroup("eg", [TypeError(1), ValueError(2)])
try:
try:
raise orig
except* TypeError:
e = sys.exception()
raise SyntaxError(3) from e
except* ValueError:
e = sys.exception()
raise SyntaxError(4) from e
except ExceptionGroup as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("", [SyntaxError(3), SyntaxError(4)]))
self.assertExceptionIsLike(
exc.exceptions[0].__context__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[0].__cause__,
ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
exc.exceptions[1].__context__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertExceptionIsLike(
exc.exceptions[1].__cause__,
ExceptionGroup("eg", [ValueError(2)]))
self.assertMetadataNotEqual(orig, exc)
self.assertMetadataEqual(orig, exc.exceptions[0].__context__)
self.assertMetadataEqual(orig, exc.exceptions[0].__cause__)
self.assertMetadataEqual(orig, exc.exceptions[1].__context__)
self.assertMetadataEqual(orig, exc.exceptions[1].__cause__)
class TestExceptStarExceptionGroupSubclass(ExceptStarTest):
def test_except_star_EG_subclass(self):
class EG(ExceptionGroup):
def __new__(cls, message, excs, code):
obj = super().__new__(cls, message, excs)
obj.code = code
return obj
def derive(self, excs):
return EG(self.message, excs, self.code)
try:
try:
try:
try:
raise TypeError(2)
except TypeError as te:
raise EG("nested", [te], 101) from None
except EG as nested:
try:
raise ValueError(1)
except ValueError as ve:
raise EG("eg", [ve, nested], 42)
except* ValueError as eg:
veg = eg
except EG as eg:
teg = eg
self.assertIsInstance(veg, EG)
self.assertIsInstance(teg, EG)
self.assertIsInstance(teg.exceptions[0], EG)
self.assertMetadataEqual(veg, teg)
self.assertEqual(veg.code, 42)
self.assertEqual(teg.code, 42)
self.assertEqual(teg.exceptions[0].code, 101)
def test_falsy_exception_group_subclass(self):
class FalsyEG(ExceptionGroup):
def __bool__(self):
return False
def derive(self, excs):
return FalsyEG(self.message, excs)
try:
try:
raise FalsyEG("eg", [TypeError(1), ValueError(2)])
except *TypeError as e:
tes = e
raise
except *ValueError as e:
ves = e
pass
except Exception as e:
exc = e
for e in [tes, ves, exc]:
self.assertFalse(e)
self.assertIsInstance(e, FalsyEG)
self.assertExceptionIsLike(exc, FalsyEG("eg", [TypeError(1)]))
self.assertExceptionIsLike(tes, FalsyEG("eg", [TypeError(1)]))
self.assertExceptionIsLike(ves, FalsyEG("eg", [ValueError(2)]))
class TestExceptStarCleanup(ExceptStarTest):
def test_sys_exception_restored(self):
try:
try:
raise ValueError(42)
except:
try:
raise TypeError(int)
except* Exception:
pass
1/0
except Exception as e:
exc = e
self.assertExceptionIsLike(exc, ZeroDivisionError('division by zero'))
self.assertExceptionIsLike(exc.__context__, ValueError(42))
self.assertEqual(sys.exception(), None)
class TestExceptStar_WeirdLeafExceptions(ExceptStarTest):
# Test that except* works when leaf exceptions are
# unhashable or have a bad custom __eq__
class UnhashableExc(ValueError):
__hash__ = None
class AlwaysEqualExc(ValueError):
def __eq__(self, other):
return True
class NeverEqualExc(ValueError):
def __eq__(self, other):
return False
class BrokenEqualExc(ValueError):
def __eq__(self, other):
raise RuntimeError()
def setUp(self):
self.bad_types = [self.UnhashableExc,
self.AlwaysEqualExc,
self.NeverEqualExc,
self.BrokenEqualExc]
def except_type(self, eg, type):
match, rest = None, None
try:
try:
raise eg
except* type as e:
match = e
except Exception as e:
rest = e
return match, rest
def test_catch_unhashable_leaf_exception(self):
for Bad in self.bad_types:
with self.subTest(Bad):
eg = ExceptionGroup("eg", [TypeError(1), Bad(2)])
match, rest = self.except_type(eg, Bad)
self.assertExceptionIsLike(
match, ExceptionGroup("eg", [Bad(2)]))
self.assertExceptionIsLike(
rest, ExceptionGroup("eg", [TypeError(1)]))
def test_propagate_unhashable_leaf(self):
for Bad in self.bad_types:
with self.subTest(Bad):
eg = ExceptionGroup("eg", [TypeError(1), Bad(2)])
match, rest = self.except_type(eg, TypeError)
self.assertExceptionIsLike(
match, ExceptionGroup("eg", [TypeError(1)]))
self.assertExceptionIsLike(
rest, ExceptionGroup("eg", [Bad(2)]))
def test_catch_nothing_unhashable_leaf(self):
for Bad in self.bad_types:
with self.subTest(Bad):
eg = ExceptionGroup("eg", [TypeError(1), Bad(2)])
match, rest = self.except_type(eg, OSError)
self.assertIsNone(match)
self.assertExceptionIsLike(rest, eg)
def test_catch_everything_unhashable_leaf(self):
for Bad in self.bad_types:
with self.subTest(Bad):
eg = ExceptionGroup("eg", [TypeError(1), Bad(2)])
match, rest = self.except_type(eg, Exception)
self.assertExceptionIsLike(match, eg)
self.assertIsNone(rest)
def test_reraise_unhashable_leaf(self):
for Bad in self.bad_types:
with self.subTest(Bad):
eg = ExceptionGroup(
"eg", [TypeError(1), Bad(2), ValueError(3)])
try:
try:
raise eg
except* TypeError:
pass
except* Bad:
raise
except Exception as e:
exc = e
self.assertExceptionIsLike(
exc, ExceptionGroup("eg", [Bad(2), ValueError(3)]))
class TestExceptStar_WeirdExceptionGroupSubclass(ExceptStarTest):
# Test that except* works with exception groups that are
# unhashable or have a bad custom __eq__
class UnhashableEG(ExceptionGroup):
__hash__ = None
def derive(self, excs):
return type(self)(self.message, excs)
class AlwaysEqualEG(ExceptionGroup):
def __eq__(self, other):
return True
def derive(self, excs):
return type(self)(self.message, excs)
class NeverEqualEG(ExceptionGroup):
def __eq__(self, other):
return False
def derive(self, excs):
return type(self)(self.message, excs)
class BrokenEqualEG(ExceptionGroup):
def __eq__(self, other):
raise RuntimeError()
def derive(self, excs):
return type(self)(self.message, excs)
def setUp(self):
self.bad_types = [self.UnhashableEG,
self.AlwaysEqualEG,
self.NeverEqualEG,
self.BrokenEqualEG]
def except_type(self, eg, type):
match, rest = None, None
try:
try:
raise eg
except* type as e:
match = e
except Exception as e:
rest = e
return match, rest
def test_catch_some_unhashable_exception_group_subclass(self):
for BadEG in self.bad_types:
with self.subTest(BadEG):
eg = BadEG("eg",
[TypeError(1),
BadEG("nested", [ValueError(2)])])
match, rest = self.except_type(eg, TypeError)
self.assertExceptionIsLike(match, BadEG("eg", [TypeError(1)]))
self.assertExceptionIsLike(rest,
BadEG("eg", [BadEG("nested", [ValueError(2)])]))
def test_catch_none_unhashable_exception_group_subclass(self):
for BadEG in self.bad_types:
with self.subTest(BadEG):
eg = BadEG("eg",
[TypeError(1),
BadEG("nested", [ValueError(2)])])
match, rest = self.except_type(eg, OSError)
self.assertIsNone(match)
self.assertExceptionIsLike(rest, eg)
def test_catch_all_unhashable_exception_group_subclass(self):
for BadEG in self.bad_types:
with self.subTest(BadEG):
eg = BadEG("eg",
[TypeError(1),
BadEG("nested", [ValueError(2)])])
match, rest = self.except_type(eg, Exception)
self.assertExceptionIsLike(match, eg)
self.assertIsNone(rest)
def test_reraise_unhashable_eg(self):
for BadEG in self.bad_types:
with self.subTest(BadEG):
eg = BadEG("eg",
[TypeError(1), ValueError(2),
BadEG("nested", [ValueError(3), OSError(4)])])
try:
try:
raise eg
except* ValueError:
pass
except* OSError:
raise
except Exception as e:
exc = e
self.assertExceptionIsLike(
exc, BadEG("eg", [TypeError(1),
BadEG("nested", [OSError(4)])]))
if __name__ == '__main__':
unittest.main()
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