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"""Tests for C-implemented GenericAlias."""
import unittest
import pickle
import copy
from collections import (
defaultdict, deque, OrderedDict, Counter, UserDict, UserList
)
from collections.abc import *
from concurrent.futures import Future
from concurrent.futures.thread import _WorkItem
from contextlib import AbstractContextManager, AbstractAsyncContextManager
from contextvars import ContextVar, Token
from dataclasses import Field
from functools import partial, partialmethod, cached_property
from graphlib import TopologicalSorter
from logging import LoggerAdapter, StreamHandler
from mailbox import Mailbox, _PartialFile
try:
import ctypes
except ImportError:
ctypes = None
from difflib import SequenceMatcher
from filecmp import dircmp
from fileinput import FileInput
from itertools import chain
from http.cookies import Morsel
try:
from multiprocessing.managers import ValueProxy
from multiprocessing.pool import ApplyResult
from multiprocessing.queues import SimpleQueue as MPSimpleQueue
except ImportError:
# _multiprocessing module is optional
ValueProxy = None
ApplyResult = None
MPSimpleQueue = None
try:
from multiprocessing.shared_memory import ShareableList
except ImportError:
# multiprocessing.shared_memory is not available on e.g. Android
ShareableList = None
from os import DirEntry
from re import Pattern, Match
from types import GenericAlias, MappingProxyType, AsyncGeneratorType
from tempfile import TemporaryDirectory, SpooledTemporaryFile
from urllib.parse import SplitResult, ParseResult
from unittest.case import _AssertRaisesContext
from queue import Queue, SimpleQueue
from weakref import WeakSet, ReferenceType, ref
import typing
from typing import Unpack
from typing import TypeVar
T = TypeVar('T')
K = TypeVar('K')
V = TypeVar('V')
_UNPACKED_TUPLES = [
# Unpacked tuple using `*`
(*tuple[int],)[0],
(*tuple[T],)[0],
(*tuple[int, str],)[0],
(*tuple[int, ...],)[0],
(*tuple[T, ...],)[0],
tuple[*tuple[int, ...]],
tuple[*tuple[T, ...]],
tuple[str, *tuple[int, ...]],
tuple[*tuple[int, ...], str],
tuple[float, *tuple[int, ...], str],
tuple[*tuple[*tuple[int, ...]]],
# Unpacked tuple using `Unpack`
Unpack[tuple[int]],
Unpack[tuple[T]],
Unpack[tuple[int, str]],
Unpack[tuple[int, ...]],
Unpack[tuple[T, ...]],
tuple[Unpack[tuple[int, ...]]],
tuple[Unpack[tuple[T, ...]]],
tuple[str, Unpack[tuple[int, ...]]],
tuple[Unpack[tuple[int, ...]], str],
tuple[float, Unpack[tuple[int, ...]], str],
tuple[Unpack[tuple[Unpack[tuple[int, ...]]]]],
# Unpacked tuple using `*` AND `Unpack`
tuple[Unpack[tuple[*tuple[int, ...]]]],
tuple[*tuple[Unpack[tuple[int, ...]]]],
]
class BaseTest(unittest.TestCase):
"""Test basics."""
generic_types = [type, tuple, list, dict, set, frozenset, enumerate,
defaultdict, deque,
SequenceMatcher,
dircmp,
FileInput,
OrderedDict, Counter, UserDict, UserList,
Pattern, Match,
partial, partialmethod, cached_property,
TopologicalSorter,
AbstractContextManager, AbstractAsyncContextManager,
Awaitable, Coroutine,
AsyncIterable, AsyncIterator,
AsyncGenerator, Generator,
Iterable, Iterator,
Reversible,
Container, Collection,
Mailbox, _PartialFile,
ContextVar, Token,
Field,
Set, MutableSet,
Mapping, MutableMapping, MappingView,
KeysView, ItemsView, ValuesView,
Sequence, MutableSequence,
MappingProxyType, AsyncGeneratorType,
DirEntry,
chain,
LoggerAdapter, StreamHandler,
TemporaryDirectory, SpooledTemporaryFile,
Queue, SimpleQueue,
_AssertRaisesContext,
SplitResult, ParseResult,
WeakSet, ReferenceType, ref,
ShareableList,
Future, _WorkItem,
Morsel]
if ctypes is not None:
generic_types.extend((ctypes.Array, ctypes.LibraryLoader))
if ValueProxy is not None:
generic_types.extend((ValueProxy, ApplyResult, MPSimpleQueue))
def test_subscriptable(self):
for t in self.generic_types:
if t is None:
continue
tname = t.__name__
with self.subTest(f"Testing {tname}"):
alias = t[int]
self.assertIs(alias.__origin__, t)
self.assertEqual(alias.__args__, (int,))
self.assertEqual(alias.__parameters__, ())
def test_unsubscriptable(self):
for t in int, str, float, Sized, Hashable:
tname = t.__name__
with self.subTest(f"Testing {tname}"):
with self.assertRaisesRegex(TypeError, tname):
t[int]
def test_instantiate(self):
for t in tuple, list, dict, set, frozenset, defaultdict, deque:
tname = t.__name__
with self.subTest(f"Testing {tname}"):
alias = t[int]
self.assertEqual(alias(), t())
if t is dict:
self.assertEqual(alias(iter([('a', 1), ('b', 2)])), dict(a=1, b=2))
self.assertEqual(alias(a=1, b=2), dict(a=1, b=2))
elif t is defaultdict:
def default():
return 'value'
a = alias(default)
d = defaultdict(default)
self.assertEqual(a['test'], d['test'])
else:
self.assertEqual(alias(iter((1, 2, 3))), t((1, 2, 3)))
def test_unbound_methods(self):
t = list[int]
a = t()
t.append(a, 'foo')
self.assertEqual(a, ['foo'])
x = t.__getitem__(a, 0)
self.assertEqual(x, 'foo')
self.assertEqual(t.__len__(a), 1)
def test_subclassing(self):
class C(list[int]):
pass
self.assertEqual(C.__bases__, (list,))
self.assertEqual(C.__class__, type)
def test_class_methods(self):
t = dict[int, None]
self.assertEqual(dict.fromkeys(range(2)), {0: None, 1: None}) # This works
self.assertEqual(t.fromkeys(range(2)), {0: None, 1: None}) # Should be equivalent
def test_no_chaining(self):
t = list[int]
with self.assertRaises(TypeError):
t[int]
def test_generic_subclass(self):
class MyList(list):
pass
t = MyList[int]
self.assertIs(t.__origin__, MyList)
self.assertEqual(t.__args__, (int,))
self.assertEqual(t.__parameters__, ())
def test_repr(self):
class MyList(list):
pass
self.assertEqual(repr(list[str]), 'list[str]')
self.assertEqual(repr(list[()]), 'list[()]')
self.assertEqual(repr(tuple[int, ...]), 'tuple[int, ...]')
x1 = tuple[
tuple( # Effectively the same as starring; TODO
tuple[int]
)
]
self.assertEqual(repr(x1), 'tuple[*tuple[int]]')
x2 = tuple[
tuple( # Ditto TODO
tuple[int, str]
)
]
self.assertEqual(repr(x2), 'tuple[*tuple[int, str]]')
x3 = tuple[
tuple( # Ditto TODO
tuple[int, ...]
)
]
self.assertEqual(repr(x3), 'tuple[*tuple[int, ...]]')
self.assertTrue(repr(MyList[int]).endswith('.BaseTest.test_repr.<locals>.MyList[int]'))
self.assertEqual(repr(list[str]()), '[]') # instances should keep their normal repr
def test_exposed_type(self):
import types
a = types.GenericAlias(list, int)
self.assertEqual(str(a), 'list[int]')
self.assertIs(a.__origin__, list)
self.assertEqual(a.__args__, (int,))
self.assertEqual(a.__parameters__, ())
def test_parameters(self):
from typing import List, Dict, Callable
D0 = dict[str, int]
self.assertEqual(D0.__args__, (str, int))
self.assertEqual(D0.__parameters__, ())
D1a = dict[str, V]
self.assertEqual(D1a.__args__, (str, V))
self.assertEqual(D1a.__parameters__, (V,))
D1b = dict[K, int]
self.assertEqual(D1b.__args__, (K, int))
self.assertEqual(D1b.__parameters__, (K,))
D2a = dict[K, V]
self.assertEqual(D2a.__args__, (K, V))
self.assertEqual(D2a.__parameters__, (K, V))
D2b = dict[T, T]
self.assertEqual(D2b.__args__, (T, T))
self.assertEqual(D2b.__parameters__, (T,))
L0 = list[str]
self.assertEqual(L0.__args__, (str,))
self.assertEqual(L0.__parameters__, ())
L1 = list[T]
self.assertEqual(L1.__args__, (T,))
self.assertEqual(L1.__parameters__, (T,))
L2 = list[list[T]]
self.assertEqual(L2.__args__, (list[T],))
self.assertEqual(L2.__parameters__, (T,))
L3 = list[List[T]]
self.assertEqual(L3.__args__, (List[T],))
self.assertEqual(L3.__parameters__, (T,))
L4a = list[Dict[K, V]]
self.assertEqual(L4a.__args__, (Dict[K, V],))
self.assertEqual(L4a.__parameters__, (K, V))
L4b = list[Dict[T, int]]
self.assertEqual(L4b.__args__, (Dict[T, int],))
self.assertEqual(L4b.__parameters__, (T,))
L5 = list[Callable[[K, V], K]]
self.assertEqual(L5.__args__, (Callable[[K, V], K],))
self.assertEqual(L5.__parameters__, (K, V))
T1 = tuple[
tuple( # Ditto TODO
tuple[int]
)
]
self.assertEqual(
T1.__args__,
tuple( # Ditto TODO
tuple[int]
)
)
self.assertEqual(T1.__parameters__, ())
T2 = tuple[
tuple( # Ditto TODO
tuple[T]
)
]
self.assertEqual(
T2.__args__,
tuple( # Ditto TODO
tuple[T]
)
)
self.assertEqual(T2.__parameters__, (T,))
T4 = tuple[
tuple( # Ditto TODO
tuple[int, str]
)
]
self.assertEqual(
T4.__args__,
tuple( # Ditto TODO
tuple[int, str]
)
)
self.assertEqual(T4.__parameters__, ())
def test_parameter_chaining(self):
from typing import List, Dict, Union, Callable
self.assertEqual(list[T][int], list[int])
self.assertEqual(dict[str, T][int], dict[str, int])
self.assertEqual(dict[T, int][str], dict[str, int])
self.assertEqual(dict[K, V][str, int], dict[str, int])
self.assertEqual(dict[T, T][int], dict[int, int])
self.assertEqual(list[list[T]][int], list[list[int]])
self.assertEqual(list[dict[T, int]][str], list[dict[str, int]])
self.assertEqual(list[dict[str, T]][int], list[dict[str, int]])
self.assertEqual(list[dict[K, V]][str, int], list[dict[str, int]])
self.assertEqual(dict[T, list[int]][str], dict[str, list[int]])
self.assertEqual(list[List[T]][int], list[List[int]])
self.assertEqual(list[Dict[K, V]][str, int], list[Dict[str, int]])
self.assertEqual(list[Union[K, V]][str, int], list[Union[str, int]])
self.assertEqual(list[Callable[[K, V], K]][str, int],
list[Callable[[str, int], str]])
self.assertEqual(dict[T, List[int]][str], dict[str, List[int]])
with self.assertRaises(TypeError):
list[int][int]
dict[T, int][str, int]
dict[str, T][str, int]
dict[T, T][str, int]
def test_equality(self):
self.assertEqual(list[int], list[int])
self.assertEqual(dict[str, int], dict[str, int])
self.assertEqual((*tuple[int],)[0], (*tuple[int],)[0])
self.assertEqual(
tuple[
tuple( # Effectively the same as starring; TODO
tuple[int]
)
],
tuple[
tuple( # Ditto TODO
tuple[int]
)
]
)
self.assertNotEqual(dict[str, int], dict[str, str])
self.assertNotEqual(list, list[int])
self.assertNotEqual(list[int], list)
self.assertNotEqual(list[int], tuple[int])
self.assertNotEqual((*tuple[int],)[0], tuple[int])
def test_isinstance(self):
self.assertTrue(isinstance([], list))
with self.assertRaises(TypeError):
isinstance([], list[str])
def test_issubclass(self):
class L(list): ...
self.assertTrue(issubclass(L, list))
with self.assertRaises(TypeError):
issubclass(L, list[str])
def test_type_generic(self):
t = type[int]
Test = t('Test', (), {})
self.assertTrue(isinstance(Test, type))
test = Test()
self.assertEqual(t(test), Test)
self.assertEqual(t(0), int)
def test_type_subclass_generic(self):
class MyType(type):
pass
with self.assertRaisesRegex(TypeError, 'MyType'):
MyType[int]
def test_pickle(self):
aliases = [GenericAlias(list, T)] + _UNPACKED_TUPLES
for alias in aliases:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(alias=alias, proto=proto):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(loaded.__origin__, alias.__origin__)
self.assertEqual(loaded.__args__, alias.__args__)
self.assertEqual(loaded.__parameters__, alias.__parameters__)
self.assertEqual(type(loaded), type(alias))
def test_copy(self):
class X(list):
def __copy__(self):
return self
def __deepcopy__(self, memo):
return self
aliases = [
GenericAlias(list, T),
GenericAlias(deque, T),
GenericAlias(X, T)
] + _UNPACKED_TUPLES
for alias in aliases:
with self.subTest(alias=alias):
copied = copy.copy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
copied = copy.deepcopy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
def test_unpack(self):
alias = tuple[str, ...]
self.assertIs(alias.__unpacked__, False)
unpacked = (*alias,)[0]
self.assertIs(unpacked.__unpacked__, True)
def test_union(self):
a = typing.Union[list[int], list[str]]
self.assertEqual(a.__args__, (list[int], list[str]))
self.assertEqual(a.__parameters__, ())
def test_union_generic(self):
a = typing.Union[list[T], tuple[T, ...]]
self.assertEqual(a.__args__, (list[T], tuple[T, ...]))
self.assertEqual(a.__parameters__, (T,))
def test_dir(self):
dir_of_gen_alias = set(dir(list[int]))
self.assertTrue(dir_of_gen_alias.issuperset(dir(list)))
for generic_alias_property in ("__origin__", "__args__", "__parameters__"):
self.assertIn(generic_alias_property, dir_of_gen_alias)
def test_weakref(self):
for t in self.generic_types:
if t is None:
continue
tname = t.__name__
with self.subTest(f"Testing {tname}"):
alias = t[int]
self.assertEqual(ref(alias)(), alias)
def test_no_kwargs(self):
# bpo-42576
with self.assertRaises(TypeError):
GenericAlias(bad=float)
def test_subclassing_types_genericalias(self):
class SubClass(GenericAlias): ...
alias = SubClass(list, int)
class Bad(GenericAlias):
def __new__(cls, *args, **kwargs):
super().__new__(cls, *args, **kwargs)
self.assertEqual(alias, list[int])
with self.assertRaises(TypeError):
Bad(list, int, bad=int)
def test_iter_creates_starred_tuple(self):
t = tuple[int, str]
iter_t = iter(t)
x = next(iter_t)
self.assertEqual(repr(x), '*tuple[int, str]')
def test_calling_next_twice_raises_stopiteration(self):
t = tuple[int, str]
iter_t = iter(t)
next(iter_t)
with self.assertRaises(StopIteration):
next(iter_t)
def test_del_iter(self):
t = tuple[int, str]
iter_x = iter(t)
del iter_x
if __name__ == "__main__":
unittest.main()