Update typing.py: remove isinstance() support (Mark struck it from the PEP).
This commit is contained in:
Guido van Rossum
parent
b980c05ef8
commit
43a79cc552
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@ -41,11 +41,9 @@ class ManagingFounder(Manager, Founder):
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class AnyTests(TestCase):
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def test_any_instance(self):
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self.assertIsInstance(Employee(), Any)
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self.assertIsInstance(42, Any)
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self.assertIsInstance(None, Any)
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self.assertIsInstance(object(), Any)
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def test_any_instance_type_error(self):
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with self.assertRaises(TypeError):
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isinstance(42, Any)
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def test_any_subclass(self):
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self.assertTrue(issubclass(Employee, Any))
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@ -109,9 +107,6 @@ class TypeVarTests(TestCase):
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def test_basic_plain(self):
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T = TypeVar('T')
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# Nothing is an instance if T.
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with self.assertRaises(TypeError):
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isinstance('', T)
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# Every class is a subclass of T.
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assert issubclass(int, T)
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assert issubclass(str, T)
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@ -119,12 +114,16 @@ class TypeVarTests(TestCase):
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assert T == T
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# T is a subclass of itself.
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assert issubclass(T, T)
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# T is an instance of TypeVar
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assert isinstance(T, TypeVar)
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def test_typevar_instance_type_error(self):
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T = TypeVar('T')
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with self.assertRaises(TypeError):
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isinstance(42, T)
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def test_basic_constrained(self):
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A = TypeVar('A', str, bytes)
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# Nothing is an instance of A.
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with self.assertRaises(TypeError):
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isinstance('', A)
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# Only str and bytes are subclasses of A.
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assert issubclass(str, A)
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assert issubclass(bytes, A)
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@ -213,8 +212,6 @@ class UnionTests(TestCase):
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def test_basics(self):
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u = Union[int, float]
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self.assertNotEqual(u, Union)
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self.assertIsInstance(42, u)
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self.assertIsInstance(3.14, u)
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self.assertTrue(issubclass(int, u))
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self.assertTrue(issubclass(float, u))
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@ -247,7 +244,6 @@ class UnionTests(TestCase):
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def test_subclass(self):
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u = Union[int, Employee]
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self.assertIsInstance(Manager(), u)
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self.assertTrue(issubclass(Manager, u))
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def test_self_subclass(self):
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@ -256,7 +252,6 @@ class UnionTests(TestCase):
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def test_multiple_inheritance(self):
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u = Union[int, Employee]
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self.assertIsInstance(ManagingFounder(), u)
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self.assertTrue(issubclass(ManagingFounder, u))
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def test_single_class_disappears(self):
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@ -309,9 +304,6 @@ class UnionTests(TestCase):
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o = Optional[int]
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u = Union[int, None]
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self.assertEqual(o, u)
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self.assertIsInstance(42, o)
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self.assertIsInstance(None, o)
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self.assertNotIsInstance(3.14, o)
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def test_empty(self):
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with self.assertRaises(TypeError):
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@ -321,11 +313,9 @@ class UnionTests(TestCase):
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assert issubclass(Union[int, str], Union)
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assert not issubclass(int, Union)
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def test_isinstance_union(self):
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# Nothing is an instance of bare Union.
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assert not isinstance(42, Union)
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assert not isinstance(int, Union)
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assert not isinstance(Union[int, str], Union)
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def test_union_instance_type_error(self):
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with self.assertRaises(TypeError):
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isinstance(42, Union[int, str])
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class TypeVarUnionTests(TestCase):
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@ -352,22 +342,11 @@ class TypeVarUnionTests(TestCase):
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TU = TypeVar('TU', Union[int, float], None)
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assert issubclass(int, TU)
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assert issubclass(float, TU)
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with self.assertRaises(TypeError):
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isinstance(42, TU)
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with self.assertRaises(TypeError):
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isinstance('', TU)
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class TupleTests(TestCase):
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def test_basics(self):
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self.assertIsInstance((42, 3.14, ''), Tuple)
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self.assertIsInstance((42, 3.14, ''), Tuple[int, float, str])
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self.assertIsInstance((42,), Tuple[int])
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self.assertNotIsInstance((3.14,), Tuple[int])
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self.assertNotIsInstance((42, 3.14), Tuple[int, float, str])
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self.assertNotIsInstance((42, 3.14, 100), Tuple[int, float, str])
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self.assertNotIsInstance((42, 3.14, 100), Tuple[int, float])
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self.assertTrue(issubclass(Tuple[int, str], Tuple))
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self.assertTrue(issubclass(Tuple[int, str], Tuple[int, str]))
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self.assertFalse(issubclass(int, Tuple))
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@ -382,14 +361,11 @@ class TupleTests(TestCase):
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pass
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self.assertTrue(issubclass(MyTuple, Tuple))
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def test_tuple_ellipsis(self):
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t = Tuple[int, ...]
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assert isinstance((), t)
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assert isinstance((1,), t)
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assert isinstance((1, 2), t)
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assert isinstance((1, 2, 3), t)
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assert not isinstance((3.14,), t)
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assert not isinstance((1, 2, 3.14,), t)
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def test_tuple_instance_type_error(self):
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with self.assertRaises(TypeError):
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isinstance((0, 0), Tuple[int, int])
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with self.assertRaises(TypeError):
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isinstance((0, 0), Tuple)
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def test_tuple_ellipsis_subclass(self):
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@ -419,18 +395,6 @@ class TupleTests(TestCase):
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class CallableTests(TestCase):
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def test_basics(self):
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c = Callable[[int, float], str]
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def flub(a: int, b: float) -> str:
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return str(a * b)
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def flob(a: int, b: int) -> str:
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return str(a * b)
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self.assertIsInstance(flub, c)
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self.assertNotIsInstance(flob, c)
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def test_self_subclass(self):
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self.assertTrue(issubclass(Callable[[int], int], Callable))
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self.assertFalse(issubclass(Callable, Callable[[int], int]))
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@ -453,91 +417,6 @@ class CallableTests(TestCase):
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self.assertNotEqual(Callable[[int], int], Callable[[], int])
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self.assertNotEqual(Callable[[int], int], Callable)
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def test_with_none(self):
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c = Callable[[None], None]
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def flub(self: None) -> None:
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pass
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def flab(self: Any) -> None:
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pass
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def flob(self: None) -> Any:
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pass
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self.assertIsInstance(flub, c)
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self.assertIsInstance(flab, c)
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self.assertNotIsInstance(flob, c) # Test contravariance.
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def test_with_subclasses(self):
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c = Callable[[Employee, Manager], Employee]
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def flub(a: Employee, b: Employee) -> Manager:
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return Manager()
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def flob(a: Manager, b: Manager) -> Employee:
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return Employee()
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self.assertIsInstance(flub, c)
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self.assertNotIsInstance(flob, c)
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def test_with_default_args(self):
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c = Callable[[int], int]
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def flub(a: int, b: float = 3.14) -> int:
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return a
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def flab(a: int, *, b: float = 3.14) -> int:
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return a
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def flob(a: int = 42) -> int:
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return a
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self.assertIsInstance(flub, c)
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self.assertIsInstance(flab, c)
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self.assertIsInstance(flob, c)
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def test_with_varargs(self):
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c = Callable[[int], int]
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def flub(*args) -> int:
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return 42
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def flab(*args: int) -> int:
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return 42
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def flob(*args: float) -> int:
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return 42
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self.assertIsInstance(flub, c)
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self.assertIsInstance(flab, c)
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self.assertNotIsInstance(flob, c)
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def test_with_method(self):
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class C:
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def imethod(self, arg: int) -> int:
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self.last_arg = arg
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return arg + 1
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@classmethod
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def cmethod(cls, arg: int) -> int:
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cls.last_cls_arg = arg
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return arg + 1
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@staticmethod
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def smethod(arg: int) -> int:
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return arg + 1
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ct = Callable[[int], int]
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self.assertIsInstance(C().imethod, ct)
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self.assertIsInstance(C().cmethod, ct)
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self.assertIsInstance(C.cmethod, ct)
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self.assertIsInstance(C().smethod, ct)
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self.assertIsInstance(C.smethod, ct)
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self.assertIsInstance(C.imethod, Callable[[Any, int], int])
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def test_cannot_subclass(self):
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with self.assertRaises(TypeError):
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@ -556,21 +435,21 @@ class CallableTests(TestCase):
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with self.assertRaises(TypeError):
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c()
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def test_varargs(self):
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ct = Callable[..., int]
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def test_callable_instance_works(self):
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f = lambda: None
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assert isinstance(f, Callable)
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assert not isinstance(None, Callable)
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def foo(a, b) -> int:
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return 42
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def bar(a=42) -> int:
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return a
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def baz(*, x, y, z) -> int:
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return 100
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self.assertIsInstance(foo, ct)
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self.assertIsInstance(bar, ct)
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self.assertIsInstance(baz, ct)
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def test_callable_instance_type_error(self):
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f = lambda: None
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with self.assertRaises(TypeError):
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assert isinstance(f, Callable[[], None])
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with self.assertRaises(TypeError):
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assert isinstance(f, Callable[[], Any])
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with self.assertRaises(TypeError):
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assert not isinstance(None, Callable[[], None])
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with self.assertRaises(TypeError):
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assert not isinstance(None, Callable[[], Any])
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def test_repr(self):
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ct0 = Callable[[], bool]
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@ -659,6 +538,10 @@ class ProtocolTests(TestCase):
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assert issubclass(list, typing.Reversible)
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assert not issubclass(int, typing.Reversible)
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def test_protocol_instance_type_error(self):
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with self.assertRaises(TypeError):
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isinstance([], typing.Reversible)
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class GenericTests(TestCase):
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@ -889,6 +772,11 @@ class ForwardRefTests(TestCase):
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right_hints = get_type_hints(t.add_right, globals(), locals())
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assert right_hints['node'] == Optional[Node[T]]
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def test_forwardref_instance_type_error(self):
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fr = typing._ForwardRef('int')
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with self.assertRaises(TypeError):
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isinstance(42, fr)
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def test_union_forward(self):
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def foo(a: Union['T']):
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@ -1069,50 +957,17 @@ class CollectionsAbcTests(TestCase):
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def test_list(self):
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assert issubclass(list, typing.List)
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assert isinstance([], typing.List)
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assert not isinstance((), typing.List)
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t = typing.List[int]
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assert isinstance([], t)
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assert isinstance([42], t)
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assert not isinstance([''], t)
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def test_set(self):
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assert issubclass(set, typing.Set)
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assert not issubclass(frozenset, typing.Set)
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assert isinstance(set(), typing.Set)
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assert not isinstance({}, typing.Set)
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t = typing.Set[int]
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assert isinstance(set(), t)
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assert isinstance({42}, t)
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assert not isinstance({''}, t)
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def test_frozenset(self):
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assert issubclass(frozenset, typing.FrozenSet)
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assert not issubclass(set, typing.FrozenSet)
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assert isinstance(frozenset(), typing.FrozenSet)
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assert not isinstance({}, typing.FrozenSet)
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t = typing.FrozenSet[int]
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assert isinstance(frozenset(), t)
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assert isinstance(frozenset({42}), t)
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assert not isinstance(frozenset({''}), t)
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assert not isinstance({42}, t)
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def test_mapping_views(self):
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# TODO: These tests are kind of lame.
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assert isinstance({}.keys(), typing.KeysView)
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assert isinstance({}.items(), typing.ItemsView)
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assert isinstance({}.values(), typing.ValuesView)
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def test_dict(self):
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assert issubclass(dict, typing.Dict)
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assert isinstance({}, typing.Dict)
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assert not isinstance([], typing.Dict)
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t = typing.Dict[int, str]
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assert isinstance({}, t)
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assert isinstance({42: ''}, t)
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assert not isinstance({42: 42}, t)
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assert not isinstance({'': 42}, t)
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assert not isinstance({'': ''}, t)
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def test_no_list_instantiation(self):
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with self.assertRaises(TypeError):
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@ -1191,8 +1046,6 @@ class CollectionsAbcTests(TestCase):
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yield 42
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g = foo()
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assert issubclass(type(g), typing.Generator)
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assert isinstance(g, typing.Generator)
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assert not isinstance(foo, typing.Generator)
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assert issubclass(typing.Generator[Manager, Employee, Manager],
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typing.Generator[Employee, Manager, Employee])
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assert not issubclass(typing.Generator[Manager, Manager, Manager],
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@ -1228,12 +1081,6 @@ class CollectionsAbcTests(TestCase):
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assert len(MMB[str, str]()) == 0
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assert len(MMB[KT, VT]()) == 0
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def test_recursive_dict(self):
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D = typing.Dict[int, 'D'] # Uses a _ForwardRef
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assert isinstance({}, D) # Easy
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assert isinstance({0: {}}, D) # Touches _ForwardRef
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assert isinstance({0: {0: {}}}, D) # Etc...
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class NamedTupleTests(TestCase):
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@ -1294,8 +1141,6 @@ class RETests(TestCase):
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def test_basics(self):
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pat = re.compile('[a-z]+', re.I)
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assert issubclass(pat.__class__, Pattern)
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assert isinstance(pat, Pattern[str])
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assert not isinstance(pat, Pattern[bytes])
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assert issubclass(type(pat), Pattern)
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assert issubclass(type(pat), Pattern[str])
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@ -1307,12 +1152,10 @@ class RETests(TestCase):
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assert issubclass(type(mat), Match[str])
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p = Pattern[Union[str, bytes]]
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assert isinstance(pat, p)
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assert issubclass(Pattern[str], Pattern)
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assert issubclass(Pattern[str], p)
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m = Match[Union[bytes, str]]
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assert isinstance(mat, m)
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assert issubclass(Match[bytes], Match)
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assert issubclass(Match[bytes], m)
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@ -1327,6 +1170,12 @@ class RETests(TestCase):
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with self.assertRaises(TypeError):
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# Too complicated?
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m[str]
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with self.assertRaises(TypeError):
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# We don't support isinstance().
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isinstance(42, Pattern)
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with self.assertRaises(TypeError):
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# We don't support isinstance().
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isinstance(42, Pattern[str])
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def test_repr(self):
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assert repr(Pattern) == 'Pattern[~AnyStr]'
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154
Lib/typing.py
154
Lib/typing.py
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@ -176,6 +176,9 @@ class _ForwardRef(TypingMeta):
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self.__forward_evaluated__ = True
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return self.__forward_value__
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def __instancecheck__(self, obj):
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raise TypeError("Forward references cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if not self.__forward_evaluated__:
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globalns = self.__forward_frame__.f_globals
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@ -186,16 +189,6 @@ class _ForwardRef(TypingMeta):
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return False # Too early.
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return issubclass(cls, self.__forward_value__)
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def __instancecheck__(self, obj):
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if not self.__forward_evaluated__:
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globalns = self.__forward_frame__.f_globals
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localns = self.__forward_frame__.f_locals
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try:
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self._eval_type(globalns, localns)
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except NameError:
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return False # Too early.
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return isinstance(obj, self.__forward_value__)
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def __repr__(self):
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return '_ForwardRef(%r)' % (self.__forward_arg__,)
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@ -259,8 +252,7 @@ class _TypeAlias:
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self.impl_type, self.type_checker)
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def __instancecheck__(self, obj):
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return (isinstance(obj, self.impl_type) and
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isinstance(self.type_checker(obj), self.type_var))
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raise TypeError("Type aliases cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if cls is Any:
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@ -332,8 +324,8 @@ class AnyMeta(TypingMeta):
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self = super().__new__(cls, name, bases, namespace, _root=_root)
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return self
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def __instancecheck__(self, instance):
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return True
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def __instancecheck__(self, obj):
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raise TypeError("Any cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if not isinstance(cls, type):
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|
|
@ -548,9 +540,8 @@ class UnionMeta(TypingMeta):
|
|||
def __hash__(self):
|
||||
return hash(self.__union_set_params__)
|
||||
|
||||
def __instancecheck__(self, instance):
|
||||
return (self.__union_set_params__ is not None and
|
||||
any(isinstance(instance, t) for t in self.__union_params__))
|
||||
def __instancecheck__(self, obj):
|
||||
raise TypeError("Unions cannot be used with isinstance().")
|
||||
|
||||
def __subclasscheck__(self, cls):
|
||||
if cls is Any:
|
||||
|
|
@ -709,18 +700,8 @@ class TupleMeta(TypingMeta):
|
|||
def __hash__(self):
|
||||
return hash(self.__tuple_params__)
|
||||
|
||||
def __instancecheck__(self, t):
|
||||
if not isinstance(t, tuple):
|
||||
return False
|
||||
if self.__tuple_params__ is None:
|
||||
return True
|
||||
if self.__tuple_use_ellipsis__:
|
||||
p = self.__tuple_params__[0]
|
||||
return all(isinstance(x, p) for x in t)
|
||||
else:
|
||||
return (len(t) == len(self.__tuple_params__) and
|
||||
all(isinstance(x, p)
|
||||
for x, p in zip(t, self.__tuple_params__)))
|
||||
def __instancecheck__(self, obj):
|
||||
raise TypeError("Tuples cannot be used with isinstance().")
|
||||
|
||||
def __subclasscheck__(self, cls):
|
||||
if cls is Any:
|
||||
|
|
@ -826,57 +807,14 @@ class CallableMeta(TypingMeta):
|
|||
def __hash__(self):
|
||||
return hash(self.__args__) ^ hash(self.__result__)
|
||||
|
||||
def __instancecheck__(self, instance):
|
||||
if not callable(instance):
|
||||
return False
|
||||
def __instancecheck__(self, obj):
|
||||
# For unparametrized Callable we allow this, because
|
||||
# typing.Callable should be equivalent to
|
||||
# collections.abc.Callable.
|
||||
if self.__args__ is None and self.__result__ is None:
|
||||
return True
|
||||
assert self.__args__ is not None
|
||||
assert self.__result__ is not None
|
||||
my_args, my_result = self.__args__, self.__result__
|
||||
import inspect # TODO: Avoid this import.
|
||||
# Would it be better to use Signature objects?
|
||||
try:
|
||||
(args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults,
|
||||
annotations) = inspect.getfullargspec(instance)
|
||||
except TypeError:
|
||||
return False # We can't find the signature. Give up.
|
||||
msg = ("When testing isinstance(<callable>, Callable[...], "
|
||||
"<calleble>'s annotations must be types.")
|
||||
if my_args is not Ellipsis:
|
||||
if kwonlyargs and (not kwonlydefaults or
|
||||
len(kwonlydefaults) < len(kwonlyargs)):
|
||||
return False
|
||||
if isinstance(instance, types.MethodType):
|
||||
# For methods, getfullargspec() includes self/cls,
|
||||
# but it's not part of the call signature, so drop it.
|
||||
del args[0]
|
||||
min_call_args = len(args)
|
||||
if defaults:
|
||||
min_call_args -= len(defaults)
|
||||
if varargs:
|
||||
max_call_args = 999999999
|
||||
if len(args) < len(my_args):
|
||||
args += [varargs] * (len(my_args) - len(args))
|
||||
return isinstance(obj, collections_abc.Callable)
|
||||
else:
|
||||
max_call_args = len(args)
|
||||
if not min_call_args <= len(my_args) <= max_call_args:
|
||||
return False
|
||||
for my_arg_type, name in zip(my_args, args):
|
||||
if name in annotations:
|
||||
annot_type = _type_check(annotations[name], msg)
|
||||
else:
|
||||
annot_type = Any
|
||||
if not issubclass(my_arg_type, annot_type):
|
||||
return False
|
||||
# TODO: If mutable type, check invariance?
|
||||
if 'return' in annotations:
|
||||
annot_return_type = _type_check(annotations['return'], msg)
|
||||
# Note contravariance here!
|
||||
if not issubclass(annot_return_type, my_result):
|
||||
return False
|
||||
# Can't find anything wrong...
|
||||
return True
|
||||
raise TypeError("Callable[] cannot be used with isinstance().")
|
||||
|
||||
def __subclasscheck__(self, cls):
|
||||
if cls is Any:
|
||||
|
|
@ -1073,13 +1011,6 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
|
|||
return False
|
||||
return issubclass(cls, self.__extra__)
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
if super().__instancecheck__(obj):
|
||||
return True
|
||||
if self.__extra__ is None:
|
||||
return False
|
||||
return isinstance(obj, self.__extra__)
|
||||
|
||||
|
||||
class Generic(metaclass=GenericMeta):
|
||||
"""Abstract base class for generic types.
|
||||
|
|
@ -1234,6 +1165,9 @@ class _ProtocolMeta(GenericMeta):
|
|||
from Generic.
|
||||
"""
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
raise TypeError("Protocols cannot be used with isinstance().")
|
||||
|
||||
def __subclasscheck__(self, cls):
|
||||
if not self._is_protocol:
|
||||
# No structural checks since this isn't a protocol.
|
||||
|
|
@ -1399,19 +1333,7 @@ class ByteString(Sequence[int], extra=collections_abc.ByteString):
|
|||
ByteString.register(type(memoryview(b'')))
|
||||
|
||||
|
||||
class _ListMeta(GenericMeta):
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
if not super().__instancecheck__(obj):
|
||||
return False
|
||||
itemtype = self.__parameters__[0]
|
||||
for x in obj:
|
||||
if not isinstance(x, itemtype):
|
||||
return False
|
||||
return True
|
||||
|
||||
|
||||
class List(list, MutableSequence[T], metaclass=_ListMeta):
|
||||
class List(list, MutableSequence[T]):
|
||||
|
||||
def __new__(cls, *args, **kwds):
|
||||
if _geqv(cls, List):
|
||||
|
|
@ -1420,19 +1342,7 @@ class List(list, MutableSequence[T], metaclass=_ListMeta):
|
|||
return list.__new__(cls, *args, **kwds)
|
||||
|
||||
|
||||
class _SetMeta(GenericMeta):
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
if not super().__instancecheck__(obj):
|
||||
return False
|
||||
itemtype = self.__parameters__[0]
|
||||
for x in obj:
|
||||
if not isinstance(x, itemtype):
|
||||
return False
|
||||
return True
|
||||
|
||||
|
||||
class Set(set, MutableSet[T], metaclass=_SetMeta):
|
||||
class Set(set, MutableSet[T]):
|
||||
|
||||
def __new__(cls, *args, **kwds):
|
||||
if _geqv(cls, Set):
|
||||
|
|
@ -1441,7 +1351,7 @@ class Set(set, MutableSet[T], metaclass=_SetMeta):
|
|||
return set.__new__(cls, *args, **kwds)
|
||||
|
||||
|
||||
class _FrozenSetMeta(_SetMeta):
|
||||
class _FrozenSetMeta(GenericMeta):
|
||||
"""This metaclass ensures set is not a subclass of FrozenSet.
|
||||
|
||||
Without this metaclass, set would be considered a subclass of
|
||||
|
|
@ -1454,11 +1364,6 @@ class _FrozenSetMeta(_SetMeta):
|
|||
return False
|
||||
return super().__subclasscheck__(cls)
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
if issubclass(obj.__class__, Set):
|
||||
return False
|
||||
return super().__instancecheck__(obj)
|
||||
|
||||
|
||||
class FrozenSet(frozenset, AbstractSet[T_co], metaclass=_FrozenSetMeta):
|
||||
|
||||
|
|
@ -1488,20 +1393,7 @@ class ValuesView(MappingView[VT_co], extra=collections_abc.ValuesView):
|
|||
pass
|
||||
|
||||
|
||||
class _DictMeta(GenericMeta):
|
||||
|
||||
def __instancecheck__(self, obj):
|
||||
if not super().__instancecheck__(obj):
|
||||
return False
|
||||
keytype, valuetype = self.__parameters__
|
||||
for key, value in obj.items():
|
||||
if not (isinstance(key, keytype) and
|
||||
isinstance(value, valuetype)):
|
||||
return False
|
||||
return True
|
||||
|
||||
|
||||
class Dict(dict, MutableMapping[KT, VT], metaclass=_DictMeta):
|
||||
class Dict(dict, MutableMapping[KT, VT]):
|
||||
|
||||
def __new__(cls, *args, **kwds):
|
||||
if _geqv(cls, Dict):
|
||||
|
|
|
|||
Loading…
Reference in New Issue