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