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Copy pathtest_typing.py
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1987 lines (1567 loc) · 61.8 KB
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import contextlib
import collections
import pickle
import re
import sys
from unittest import TestCase, main, skipUnless, SkipTest
from copy import copy, deepcopy
from typing import Any
from typing import TypeVar, AnyStr
from typing import T, KT, VT # Not in __all__.
from typing import Union, Optional
from typing import Tuple, List, MutableMapping
from typing import Callable
from typing import Generic, ClassVar
from typing import cast
from typing import get_type_hints
from typing import no_type_check, no_type_check_decorator
from typing import Type
from typing import NewType
from typing import NamedTuple
from typing import IO, TextIO, BinaryIO
from typing import Pattern, Match
import abc
import typing
try:
import collections.abc as collections_abc
except ImportError:
import collections as collections_abc # Fallback for PY3.2.
class BaseTestCase(TestCase):
def assertIsSubclass(self, cls, class_or_tuple, msg=None):
if not issubclass(cls, class_or_tuple):
message = '%r is not a subclass of %r' % (cls, class_or_tuple)
if msg is not None:
message += ' : %s' % msg
raise self.failureException(message)
def assertNotIsSubclass(self, cls, class_or_tuple, msg=None):
if issubclass(cls, class_or_tuple):
message = '%r is a subclass of %r' % (cls, class_or_tuple)
if msg is not None:
message += ' : %s' % msg
raise self.failureException(message)
class Employee:
pass
class Manager(Employee):
pass
class Founder(Employee):
pass
class ManagingFounder(Manager, Founder):
pass
class AnyTests(BaseTestCase):
def test_any_instance_type_error(self):
with self.assertRaises(TypeError):
isinstance(42, Any)
def test_any_subclass_type_error(self):
with self.assertRaises(TypeError):
issubclass(Employee, Any)
with self.assertRaises(TypeError):
issubclass(Any, Employee)
def test_repr(self):
self.assertEqual(repr(Any), 'typing.Any')
def test_errors(self):
with self.assertRaises(TypeError):
issubclass(42, Any)
with self.assertRaises(TypeError):
Any[int] # Any is not a generic type.
def test_cannot_subclass(self):
with self.assertRaises(TypeError):
class A(Any):
pass
with self.assertRaises(TypeError):
class A(type(Any)):
pass
def test_cannot_instantiate(self):
with self.assertRaises(TypeError):
Any()
with self.assertRaises(TypeError):
type(Any)()
def test_cannot_subscript(self):
with self.assertRaises(TypeError):
Any[int]
def test_any_works_with_alias(self):
# These expressions must simply not fail.
typing.Match[Any]
typing.Pattern[Any]
typing.IO[Any]
class TypeVarTests(BaseTestCase):
def test_basic_plain(self):
T = TypeVar('T')
# T equals itself.
self.assertEqual(T, T)
# T is an instance of TypeVar
self.assertIsInstance(T, TypeVar)
def test_typevar_instance_type_error(self):
T = TypeVar('T')
with self.assertRaises(TypeError):
isinstance(42, T)
def test_typevar_subclass_type_error(self):
T = TypeVar('T')
with self.assertRaises(TypeError):
issubclass(int, T)
with self.assertRaises(TypeError):
issubclass(T, int)
def test_constrained_error(self):
with self.assertRaises(TypeError):
X = TypeVar('X', int)
X
def test_union_unique(self):
X = TypeVar('X')
Y = TypeVar('Y')
self.assertNotEqual(X, Y)
self.assertEqual(Union[X], X)
self.assertNotEqual(Union[X], Union[X, Y])
self.assertEqual(Union[X, X], X)
self.assertNotEqual(Union[X, int], Union[X])
self.assertNotEqual(Union[X, int], Union[int])
self.assertEqual(Union[X, int].__args__, (X, int))
self.assertEqual(Union[X, int].__parameters__, (X,))
self.assertIs(Union[X, int].__origin__, Union)
def test_union_constrained(self):
A = TypeVar('A', str, bytes)
self.assertNotEqual(Union[A, str], Union[A])
def test_repr(self):
self.assertEqual(repr(T), '~T')
self.assertEqual(repr(KT), '~KT')
self.assertEqual(repr(VT), '~VT')
self.assertEqual(repr(AnyStr), '~AnyStr')
T_co = TypeVar('T_co', covariant=True)
self.assertEqual(repr(T_co), '+T_co')
T_contra = TypeVar('T_contra', contravariant=True)
self.assertEqual(repr(T_contra), '-T_contra')
def test_no_redefinition(self):
self.assertNotEqual(TypeVar('T'), TypeVar('T'))
self.assertNotEqual(TypeVar('T', int, str), TypeVar('T', int, str))
def test_cannot_subclass_vars(self):
with self.assertRaises(TypeError):
class V(TypeVar('T')):
pass
def test_cannot_subclass_var_itself(self):
with self.assertRaises(TypeError):
class V(TypeVar):
pass
def test_cannot_instantiate_vars(self):
with self.assertRaises(TypeError):
TypeVar('A')()
def test_bound_errors(self):
with self.assertRaises(TypeError):
TypeVar('X', bound=42)
with self.assertRaises(TypeError):
TypeVar('X', str, float, bound=Employee)
class UnionTests(BaseTestCase):
def test_basics(self):
u = Union[int, float]
self.assertNotEqual(u, Union)
def test_subclass_error(self):
with self.assertRaises(TypeError):
issubclass(int, Union)
with self.assertRaises(TypeError):
issubclass(Union, int)
with self.assertRaises(TypeError):
issubclass(int, Union[int, str])
with self.assertRaises(TypeError):
issubclass(Union[int, str], int)
def test_union_any(self):
u = Union[Any]
self.assertEqual(u, Any)
u1 = Union[int, Any]
u2 = Union[Any, int]
u3 = Union[Any, object]
self.assertEqual(u1, u2)
self.assertNotEqual(u1, Any)
self.assertNotEqual(u2, Any)
self.assertNotEqual(u3, Any)
def test_union_object(self):
u = Union[object]
self.assertEqual(u, object)
u = Union[int, object]
self.assertEqual(u, object)
u = Union[object, int]
self.assertEqual(u, object)
def test_unordered(self):
u1 = Union[int, float]
u2 = Union[float, int]
self.assertEqual(u1, u2)
def test_single_class_disappears(self):
t = Union[Employee]
self.assertIs(t, Employee)
def test_base_class_disappears(self):
u = Union[Employee, Manager, int]
self.assertEqual(u, Union[int, Employee])
u = Union[Manager, int, Employee]
self.assertEqual(u, Union[int, Employee])
u = Union[Employee, Manager]
self.assertIs(u, Employee)
def test_union_union(self):
u = Union[int, float]
v = Union[u, Employee]
self.assertEqual(v, Union[int, float, Employee])
def test_repr(self):
self.assertEqual(repr(Union), 'typing.Union')
u = Union[Employee, int]
self.assertEqual(repr(u), 'typing.Union[%s.Employee, int]' % __name__)
u = Union[int, Employee]
self.assertEqual(repr(u), 'typing.Union[int, %s.Employee]' % __name__)
def test_cannot_subclass(self):
with self.assertRaises(TypeError):
class C(Union):
pass
with self.assertRaises(TypeError):
class C(type(Union)):
pass
with self.assertRaises(TypeError):
class C(Union[int, str]):
pass
def test_cannot_instantiate(self):
with self.assertRaises(TypeError):
Union()
with self.assertRaises(TypeError):
type(Union)()
u = Union[int, float]
with self.assertRaises(TypeError):
u()
with self.assertRaises(TypeError):
type(u)()
def test_union_generalization(self):
self.assertFalse(Union[str, typing.Iterable[int]] == str)
self.assertFalse(Union[str, typing.Iterable[int]] == typing.Iterable[int])
self.assertTrue(Union[str, typing.Iterable] == typing.Iterable)
def test_optional(self):
o = Optional[int]
u = Union[int, None]
self.assertEqual(o, u)
def test_empty(self):
with self.assertRaises(TypeError):
Union[()]
def test_union_instance_type_error(self):
with self.assertRaises(TypeError):
isinstance(42, Union[int, str])
def test_union_str_pattern(self):
# Shouldn't crash; see http://bugs.python.org/issue25390
A = Union[str, Pattern]
A
def test_etree(self):
# See https://github.com/python/typing/issues/229
# (Only relevant for Python 2.)
try:
from xml.etree.cElementTree import Element
except ImportError:
raise SkipTest("cElementTree not found")
Union[Element, str] # Shouldn't crash
def Elem(*args):
return Element(*args)
Union[Elem, str] # Nor should this
class TupleTests(BaseTestCase):
def test_basics(self):
with self.assertRaises(TypeError):
issubclass(Tuple, Tuple[int, str])
with self.assertRaises(TypeError):
issubclass(tuple, Tuple[int, str])
class TP(tuple): ...
self.assertTrue(issubclass(tuple, Tuple))
self.assertTrue(issubclass(TP, Tuple))
def test_equality(self):
self.assertEqual(Tuple[int], Tuple[int])
self.assertEqual(Tuple[int, ...], Tuple[int, ...])
self.assertNotEqual(Tuple[int], Tuple[int, int])
self.assertNotEqual(Tuple[int], Tuple[int, ...])
def test_tuple_subclass(self):
class MyTuple(tuple):
pass
self.assertTrue(issubclass(MyTuple, Tuple))
def test_tuple_instance_type_error(self):
with self.assertRaises(TypeError):
isinstance((0, 0), Tuple[int, int])
self.assertIsInstance((0, 0), Tuple)
def test_repr(self):
self.assertEqual(repr(Tuple), 'typing.Tuple')
self.assertEqual(repr(Tuple[()]), 'typing.Tuple[()]')
self.assertEqual(repr(Tuple[int, float]), 'typing.Tuple[int, float]')
self.assertEqual(repr(Tuple[int, ...]), 'typing.Tuple[int, ...]')
def test_errors(self):
with self.assertRaises(TypeError):
issubclass(42, Tuple)
with self.assertRaises(TypeError):
issubclass(42, Tuple[int])
class CallableTests(BaseTestCase):
def test_self_subclass(self):
with self.assertRaises(TypeError):
self.assertTrue(issubclass(type(lambda x: x), Callable[[int], int]))
self.assertTrue(issubclass(type(lambda x: x), Callable))
def test_eq_hash(self):
self.assertEqual(Callable[[int], int], Callable[[int], int])
self.assertEqual(len({Callable[[int], int], Callable[[int], int]}), 1)
self.assertNotEqual(Callable[[int], int], Callable[[int], str])
self.assertNotEqual(Callable[[int], int], Callable[[str], int])
self.assertNotEqual(Callable[[int], int], Callable[[int, int], int])
self.assertNotEqual(Callable[[int], int], Callable[[], int])
self.assertNotEqual(Callable[[int], int], Callable)
def test_cannot_instantiate(self):
with self.assertRaises(TypeError):
Callable()
with self.assertRaises(TypeError):
type(Callable)()
c = Callable[[int], str]
with self.assertRaises(TypeError):
c()
with self.assertRaises(TypeError):
type(c)()
def test_callable_wrong_forms(self):
with self.assertRaises(TypeError):
Callable[[...], int]
with self.assertRaises(TypeError):
Callable[(), int]
with self.assertRaises(TypeError):
Callable[[()], int]
with self.assertRaises(TypeError):
Callable[[int, 1], 2]
def test_callable_instance_works(self):
def f():
pass
self.assertIsInstance(f, Callable)
self.assertNotIsInstance(None, Callable)
def test_callable_instance_type_error(self):
def f():
pass
with self.assertRaises(TypeError):
self.assertIsInstance(f, Callable[[], None])
with self.assertRaises(TypeError):
self.assertIsInstance(f, Callable[[], Any])
with self.assertRaises(TypeError):
self.assertNotIsInstance(None, Callable[[], None])
with self.assertRaises(TypeError):
self.assertNotIsInstance(None, Callable[[], Any])
def test_repr(self):
ct0 = Callable[[], bool]
self.assertEqual(repr(ct0), 'typing.Callable[[], bool]')
ct2 = Callable[[str, float], int]
self.assertEqual(repr(ct2), 'typing.Callable[[str, float], int]')
ctv = Callable[..., str]
self.assertEqual(repr(ctv), 'typing.Callable[..., str]')
def test_callable_with_ellipsis(self):
def foo(a: Callable[..., T]):
pass
self.assertEqual(get_type_hints(foo, globals(), locals()),
{'a': Callable[..., T]})
def test_ellipsis_in_generic(self):
# Shouldn't crash; see https://github.com/python/typing/issues/259
typing.List[Callable[..., str]]
XK = TypeVar('XK', str, bytes)
XV = TypeVar('XV')
class SimpleMapping(Generic[XK, XV]):
def __getitem__(self, key: XK) -> XV:
...
def __setitem__(self, key: XK, value: XV):
...
def get(self, key: XK, default: XV = None) -> XV:
...
class MySimpleMapping(SimpleMapping[XK, XV]):
def __init__(self):
self.store = {}
def __getitem__(self, key: str):
return self.store[key]
def __setitem__(self, key: str, value):
self.store[key] = value
def get(self, key: str, default=None):
try:
return self.store[key]
except KeyError:
return default
class ProtocolTests(BaseTestCase):
def test_supports_int(self):
self.assertIsSubclass(int, typing.SupportsInt)
self.assertNotIsSubclass(str, typing.SupportsInt)
def test_supports_float(self):
self.assertIsSubclass(float, typing.SupportsFloat)
self.assertNotIsSubclass(str, typing.SupportsFloat)
def test_supports_complex(self):
# Note: complex itself doesn't have __complex__.
class C:
def __complex__(self):
return 0j
self.assertIsSubclass(C, typing.SupportsComplex)
self.assertNotIsSubclass(str, typing.SupportsComplex)
def test_supports_bytes(self):
# Note: bytes itself doesn't have __bytes__.
class B:
def __bytes__(self):
return b''
self.assertIsSubclass(B, typing.SupportsBytes)
self.assertNotIsSubclass(str, typing.SupportsBytes)
def test_supports_abs(self):
self.assertIsSubclass(float, typing.SupportsAbs)
self.assertIsSubclass(int, typing.SupportsAbs)
self.assertNotIsSubclass(str, typing.SupportsAbs)
def test_supports_round(self):
issubclass(float, typing.SupportsRound)
self.assertIsSubclass(float, typing.SupportsRound)
self.assertIsSubclass(int, typing.SupportsRound)
self.assertNotIsSubclass(str, typing.SupportsRound)
def test_reversible(self):
self.assertIsSubclass(list, typing.Reversible)
self.assertNotIsSubclass(int, typing.Reversible)
def test_protocol_instance_type_error(self):
with self.assertRaises(TypeError):
isinstance(0, typing.SupportsAbs)
class GenericTests(BaseTestCase):
def test_basics(self):
X = SimpleMapping[str, Any]
self.assertEqual(X.__parameters__, ())
with self.assertRaises(TypeError):
X[str]
with self.assertRaises(TypeError):
X[str, str]
Y = SimpleMapping[XK, str]
self.assertEqual(Y.__parameters__, (XK,))
Y[str]
with self.assertRaises(TypeError):
Y[str, str]
def test_generic_errors(self):
T = TypeVar('T')
with self.assertRaises(TypeError):
Generic[T]()
with self.assertRaises(TypeError):
isinstance([], List[int])
with self.assertRaises(TypeError):
issubclass(list, List[int])
def test_init(self):
T = TypeVar('T')
S = TypeVar('S')
with self.assertRaises(TypeError):
Generic[T, T]
with self.assertRaises(TypeError):
Generic[T, S, T]
def test_repr(self):
self.assertEqual(repr(SimpleMapping),
__name__ + '.' + 'SimpleMapping')
self.assertEqual(repr(MySimpleMapping),
__name__ + '.' + 'MySimpleMapping')
def test_chain_repr(self):
T = TypeVar('T')
S = TypeVar('S')
class C(Generic[T]):
pass
X = C[Tuple[S, T]]
self.assertEqual(X, C[Tuple[S, T]])
self.assertNotEqual(X, C[Tuple[T, S]])
Y = X[T, int]
self.assertEqual(Y, X[T, int])
self.assertNotEqual(Y, X[S, int])
self.assertNotEqual(Y, X[T, str])
Z = Y[str]
self.assertEqual(Z, Y[str])
self.assertNotEqual(Z, Y[int])
self.assertNotEqual(Z, Y[T])
self.assertTrue(str(Z).endswith(
'.C[typing.Tuple[str, int]]'))
def test_new_repr(self):
T = TypeVar('T')
U = TypeVar('U', covariant=True)
S = TypeVar('S')
self.assertEqual(repr(List), 'typing.List')
self.assertEqual(repr(List[T]), 'typing.List[~T]')
self.assertEqual(repr(List[U]), 'typing.List[+U]')
self.assertEqual(repr(List[S][T][int]), 'typing.List[int]')
self.assertEqual(repr(List[int]), 'typing.List[int]')
def test_new_repr_complex(self):
T = TypeVar('T')
TS = TypeVar('TS')
self.assertEqual(repr(typing.Mapping[T, TS][TS, T]), 'typing.Mapping[~TS, ~T]')
self.assertEqual(repr(List[Tuple[T, TS]][int, T]),
'typing.List[typing.Tuple[int, ~T]]')
self.assertEqual(repr(List[Tuple[T, T]][List[int]]),
'typing.List[typing.Tuple[typing.List[int], typing.List[int]]]')
def test_new_repr_bare(self):
T = TypeVar('T')
self.assertEqual(repr(Generic[T]), 'typing.Generic[~T]')
self.assertEqual(repr(typing._Protocol[T]), 'typing.Protocol[~T]')
class C(typing.Dict[Any, Any]): ...
# this line should just work
repr(C.__mro__)
def test_dict(self):
T = TypeVar('T')
class B(Generic[T]):
pass
b = B()
b.foo = 42
self.assertEqual(b.__dict__, {'foo': 42})
class C(B[int]):
pass
c = C()
c.bar = 'abc'
self.assertEqual(c.__dict__, {'bar': 'abc'})
def test_false_subclasses(self):
class MyMapping(MutableMapping[str, str]): pass
self.assertNotIsInstance({}, MyMapping)
self.assertNotIsSubclass(dict, MyMapping)
def test_abc_bases(self):
class MM(MutableMapping[str, str]):
def __getitem__(self, k):
return None
def __setitem__(self, k, v):
pass
def __delitem__(self, k):
pass
def __iter__(self):
return iter(())
def __len__(self):
return 0
# this should just work
MM().update()
self.assertIsInstance(MM(), collections_abc.MutableMapping)
self.assertIsInstance(MM(), MutableMapping)
self.assertNotIsInstance(MM(), List)
self.assertNotIsInstance({}, MM)
def test_multiple_bases(self):
class MM1(MutableMapping[str, str], collections_abc.MutableMapping):
pass
with self.assertRaises(TypeError):
# consistent MRO not possible
class MM2(collections_abc.MutableMapping, MutableMapping[str, str]):
pass
def test_orig_bases(self):
T = TypeVar('T')
class C(typing.Dict[str, T]): ...
self.assertEqual(C.__orig_bases__, (typing.Dict[str, T],))
def test_naive_runtime_checks(self):
def naive_dict_check(obj, tp):
# Check if a dictionary conforms to Dict type
if len(tp.__parameters__) > 0:
raise NotImplementedError
if tp.__args__:
KT, VT = tp.__args__
return all(isinstance(k, KT) and isinstance(v, VT)
for k, v in obj.items())
self.assertTrue(naive_dict_check({'x': 1}, typing.Dict[str, int]))
self.assertFalse(naive_dict_check({1: 'x'}, typing.Dict[str, int]))
with self.assertRaises(NotImplementedError):
naive_dict_check({1: 'x'}, typing.Dict[str, T])
def naive_generic_check(obj, tp):
# Check if an instance conforms to the generic class
if not hasattr(obj, '__orig_class__'):
raise NotImplementedError
return obj.__orig_class__ == tp
class Node(Generic[T]): ...
self.assertTrue(naive_generic_check(Node[int](), Node[int]))
self.assertFalse(naive_generic_check(Node[str](), Node[int]))
self.assertFalse(naive_generic_check(Node[str](), List))
with self.assertRaises(NotImplementedError):
naive_generic_check([1,2,3], Node[int])
def naive_list_base_check(obj, tp):
# Check if list conforms to a List subclass
return all(isinstance(x, tp.__orig_bases__[0].__args__[0])
for x in obj)
class C(List[int]): ...
self.assertTrue(naive_list_base_check([1, 2, 3], C))
self.assertFalse(naive_list_base_check(['a', 'b'], C))
def test_multi_subscr_base(self):
T = TypeVar('T')
U = TypeVar('U')
V = TypeVar('V')
class C(List[T][U][V]): ...
class D(C, List[T][U][V]): ...
self.assertEqual(C.__parameters__, (V,))
self.assertEqual(D.__parameters__, (V,))
self.assertEqual(C[int].__parameters__, ())
self.assertEqual(D[int].__parameters__, ())
self.assertEqual(C[int].__args__, (int,))
self.assertEqual(D[int].__args__, (int,))
self.assertEqual(C.__bases__, (List,))
self.assertEqual(D.__bases__, (C, List))
self.assertEqual(C.__orig_bases__, (List[T][U][V],))
self.assertEqual(D.__orig_bases__, (C, List[T][U][V]))
def test_extended_generic_rules_eq(self):
T = TypeVar('T')
U = TypeVar('U')
self.assertEqual(Tuple[T, T][int], Tuple[int, int])
self.assertEqual(typing.Iterable[Tuple[T, T]][T], typing.Iterable[Tuple[T, T]])
with self.assertRaises(TypeError):
Tuple[T, int][()]
with self.assertRaises(TypeError):
Tuple[T, U][T, ...]
self.assertEqual(Union[T, int][int], int)
self.assertEqual(Union[T, U][int, Union[int, str]], Union[int, str])
class Base: ...
class Derived(Base): ...
self.assertEqual(Union[T, Base][Derived], Base)
with self.assertRaises(TypeError):
Union[T, int][1]
self.assertEqual(Callable[[T], T][KT], Callable[[KT], KT])
self.assertEqual(Callable[..., List[T]][int], Callable[..., List[int]])
with self.assertRaises(TypeError):
Callable[[T], U][..., int]
with self.assertRaises(TypeError):
Callable[[T], U][[], int]
def test_extended_generic_rules_repr(self):
T = TypeVar('T')
self.assertEqual(repr(Union[Tuple, Callable]).replace('typing.', ''),
'Union[Tuple, Callable]')
self.assertEqual(repr(Union[Tuple, Tuple[int]]).replace('typing.', ''),
'Tuple')
self.assertEqual(repr(Callable[..., Optional[T]][int]).replace('typing.', ''),
'Callable[..., Union[int, NoneType]]')
self.assertEqual(repr(Callable[[], List[T]][int]).replace('typing.', ''),
'Callable[[], List[int]]')
def test_generic_forvard_ref(self):
def foobar(x: List[List['T']]): ...
T = TypeVar('T')
self.assertEqual(get_type_hints(foobar, globals(), locals()), {'x': List[List[T]]})
def barfoo(x: Tuple[T, ...]): ...
self.assertIs(get_type_hints(barfoo, globals(), locals())['x'], Tuple[T, ...])
def test_extended_generic_rules_subclassing(self):
class T1(Tuple[T, KT]): ...
class T2(Tuple[T, ...]): ...
class C1(Callable[[T], T]): ...
class C2(Callable[..., int]):
def __call__(self):
return None
self.assertEqual(T1.__parameters__, (T, KT))
self.assertEqual(T1[int, str].__args__, (int, str))
self.assertEqual(T1[int, T].__origin__, T1)
self.assertEqual(T2.__parameters__, (T,))
with self.assertRaises(TypeError):
T1[int]
with self.assertRaises(TypeError):
T2[int, str]
self.assertEqual(repr(C1[int]).split('.')[-1], 'C1[int]')
self.assertEqual(C2.__parameters__, ())
self.assertIsInstance(C2(), collections_abc.Callable)
self.assertIsSubclass(C2, collections_abc.Callable)
self.assertIsSubclass(C1, collections_abc.Callable)
self.assertIsInstance(T1(), tuple)
self.assertIsSubclass(T2, tuple)
self.assertIsSubclass(Tuple[int, ...], typing.Sequence)
self.assertIsSubclass(Tuple[int, ...], typing.Iterable)
def test_fail_with_bare_union(self):
with self.assertRaises(TypeError):
List[Union]
with self.assertRaises(TypeError):
Tuple[Optional]
with self.assertRaises(TypeError):
ClassVar[ClassVar]
with self.assertRaises(TypeError):
List[ClassVar[int]]
def test_fail_with_bare_generic(self):
T = TypeVar('T')
with self.assertRaises(TypeError):
List[Generic]
with self.assertRaises(TypeError):
Tuple[Generic[T]]
with self.assertRaises(TypeError):
List[typing._Protocol]
def test_type_erasure_special(self):
T = TypeVar('T')
class MyTup(Tuple[T, T]): ...
self.assertIs(MyTup[int]().__class__, MyTup)
self.assertIs(MyTup[int]().__orig_class__, MyTup[int])
class MyCall(Callable[..., T]):
def __call__(self): return None
self.assertIs(MyCall[T]().__class__, MyCall)
self.assertIs(MyCall[T]().__orig_class__, MyCall[T])
class MyDict(typing.Dict[T, T]): ...
self.assertIs(MyDict[int]().__class__, MyDict)
self.assertIs(MyDict[int]().__orig_class__, MyDict[int])
class MyDef(typing.DefaultDict[str, T]): ...
self.assertIs(MyDef[int]().__class__, MyDef)
self.assertIs(MyDef[int]().__orig_class__, MyDef[int])
def test_all_repr_eq_any(self):
objs = (getattr(typing, el) for el in typing.__all__)
for obj in objs:
self.assertNotEqual(repr(obj), '')
self.assertEqual(obj, obj)
if getattr(obj, '__parameters__', None) and len(obj.__parameters__) == 1:
self.assertEqual(obj[Any].__args__, (Any,))
if isinstance(obj, type):
for base in obj.__mro__:
self.assertNotEqual(repr(base), '')
self.assertEqual(base, base)
def test_substitution_helper(self):
T = TypeVar('T')
KT = TypeVar('KT')
VT = TypeVar('VT')
class Map(Generic[KT, VT]):
def meth(self, k: KT, v: VT): ...
StrMap = Map[str, T]
obj = StrMap[int]()
new_args = typing._subs_tree(obj.__orig_class__)
new_annots = {k: typing._replace_arg(v, type(obj).__parameters__, new_args)
for k, v in obj.meth.__annotations__.items()}
self.assertEqual(new_annots, {'k': str, 'v': int})
def test_pickle(self):
global C # pickle wants to reference the class by name
T = TypeVar('T')
class B(Generic[T]):
pass
class C(B[int]):
pass
c = C()
c.foo = 42
c.bar = 'abc'
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
z = pickle.dumps(c, proto)
x = pickle.loads(z)
self.assertEqual(x.foo, 42)
self.assertEqual(x.bar, 'abc')
self.assertEqual(x.__dict__, {'foo': 42, 'bar': 'abc'})
simples = [Any, Union, Tuple, Callable, ClassVar, List, typing.Iterable]
for s in simples:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
z = pickle.dumps(s, proto)
x = pickle.loads(z)
self.assertEqual(s, x)
def test_copy_and_deepcopy(self):
T = TypeVar('T')
class Node(Generic[T]): ...
things = [Union[T, int], Tuple[T, int], Callable[..., T], Callable[[int], int],
Tuple[Any, Any], Node[T], Node[int], Node[Any], typing.Iterable[T],
typing.Iterable[Any], typing.Iterable[int], typing.Dict[int, str],
typing.Dict[T, Any], ClassVar[int], ClassVar[List[T]], Tuple['T', 'T'],
Union['T', int], List['T'], typing.Mapping['T', int]]
for t in things + [Any]:
self.assertEqual(t, copy(t))
self.assertEqual(t, deepcopy(t))
def test_errors(self):
with self.assertRaises(TypeError):
B = SimpleMapping[XK, Any]
class C(Generic[B]):
pass
def test_repr_2(self):
PY32 = sys.version_info[:2] < (3, 3)
class C(Generic[T]):
pass
self.assertEqual(C.__module__, __name__)
if not PY32:
self.assertEqual(C.__qualname__,
'GenericTests.test_repr_2.<locals>.C')
self.assertEqual(repr(C).split('.')[-1], 'C')
X = C[int]
self.assertEqual(X.__module__, __name__)
if not PY32:
self.assertTrue(X.__qualname__.endswith('.<locals>.C'))
self.assertEqual(repr(X).split('.')[-1], 'C[int]')
class Y(C[int]):
pass
self.assertEqual(Y.__module__, __name__)
if not PY32:
self.assertEqual(Y.__qualname__,
'GenericTests.test_repr_2.<locals>.Y')
self.assertEqual(repr(Y).split('.')[-1], 'Y')
def test_eq_1(self):
self.assertEqual(Generic, Generic)
self.assertEqual(Generic[T], Generic[T])
self.assertNotEqual(Generic[KT], Generic[VT])
def test_eq_2(self):
class A(Generic[T]):
pass
class B(Generic[T]):
pass
self.assertEqual(A, A)
self.assertNotEqual(A, B)
self.assertEqual(A[T], A[T])
self.assertNotEqual(A[T], B[T])
def test_multiple_inheritance(self):
class A(Generic[T, VT]):
pass
class B(Generic[KT, T]):
pass
class C(A[T, VT], Generic[VT, T, KT], B[KT, T]):
pass
self.assertEqual(C.__parameters__, (VT, T, KT))
def test_nested(self):
G = Generic
class Visitor(G[T]):
a = None
def set(self, a: T):
self.a = a
def get(self):
return self.a
def visit(self) -> T:
return self.a
V = Visitor[typing.List[int]]
class IntListVisitor(V):
def append(self, x: int):
self.a.append(x)
a = IntListVisitor()
a.set([])
a.append(1)
a.append(42)
self.assertEqual(a.get(), [1, 42])
def test_type_erasure(self):
T = TypeVar('T')
class Node(Generic[T]):
def __init__(self, label: T,
left: 'Node[T]' = None,
right: 'Node[T]' = None):
self.label = label # type: T
self.left = left # type: Optional[Node[T]]
self.right = right # type: Optional[Node[T]]
def foo(x: T):
a = Node(x)
b = Node[T](x)
c = Node[Any](x)
self.assertIs(type(a), Node)
self.assertIs(type(b), Node)
self.assertIs(type(c), Node)
self.assertEqual(a.label, x)
self.assertEqual(b.label, x)
self.assertEqual(c.label, x)
foo(42)
def test_implicit_any(self):
T = TypeVar('T')