"""Unit tests for collections.py.""" import collections import copy import doctest import inspect import keyword import operator import pickle from random import choice, randrange import re import string import sys from test import support import types import unittest from collections import namedtuple, Counter, OrderedDict, _count_elements from collections import UserDict, UserString, UserList from collections import ChainMap from collections import deque from collections.abc import Awaitable, Coroutine, AsyncIterator, AsyncIterable from collections.abc import Hashable, Iterable, Iterator, Generator, Reversible from collections.abc import Sized, Container, Callable, Collection from collections.abc import Set, MutableSet from collections.abc import Mapping, MutableMapping, KeysView, ItemsView, ValuesView from collections.abc import Sequence, MutableSequence from collections.abc import ByteString class TestUserObjects(unittest.TestCase): def _superset_test(self, a, b): self.assertGreaterEqual( set(dir(a)), set(dir(b)), '{a} should have all the methods of {b}'.format( a=a.__name__, b=b.__name__, ), ) def test_str_protocol(self): self._superset_test(UserString, str) def test_list_protocol(self): self._superset_test(UserList, list) def test_dict_protocol(self): self._superset_test(UserDict, dict) ################################################################################ ### ChainMap (helper class for configparser and the string module) ################################################################################ class TestChainMap(unittest.TestCase): def test_basics(self): c = ChainMap() c['a'] = 1 c['b'] = 2 d = c.new_child() d['b'] = 20 d['c'] = 30 self.assertEqual(d.maps, [{'b':20, 'c':30}, {'a':1, 'b':2}]) # check internal state self.assertEqual(d.items(), dict(a=1, b=20, c=30).items()) # check items/iter/getitem self.assertEqual(len(d), 3) # check len for key in 'abc': # check contains self.assertIn(key, d) for k, v in dict(a=1, b=20, c=30, z=100).items(): # check get self.assertEqual(d.get(k, 100), v) del d['b'] # unmask a value self.assertEqual(d.maps, [{'c':30}, {'a':1, 'b':2}]) # check internal state self.assertEqual(d.items(), dict(a=1, b=2, c=30).items()) # check items/iter/getitem self.assertEqual(len(d), 3) # check len for key in 'abc': # check contains self.assertIn(key, d) for k, v in dict(a=1, b=2, c=30, z=100).items(): # check get self.assertEqual(d.get(k, 100), v) self.assertIn(repr(d), [ # check repr type(d).__name__ + "({'c': 30}, {'a': 1, 'b': 2})", type(d).__name__ + "({'c': 30}, {'b': 2, 'a': 1})" ]) for e in d.copy(), copy.copy(d): # check shallow copies self.assertEqual(d, e) self.assertEqual(d.maps, e.maps) self.assertIsNot(d, e) self.assertIsNot(d.maps[0], e.maps[0]) for m1, m2 in zip(d.maps[1:], e.maps[1:]): self.assertIs(m1, m2) # check deep copies for proto in range(pickle.HIGHEST_PROTOCOL + 1): e = pickle.loads(pickle.dumps(d, proto)) self.assertEqual(d, e) self.assertEqual(d.maps, e.maps) self.assertIsNot(d, e) for m1, m2 in zip(d.maps, e.maps): self.assertIsNot(m1, m2, e) for e in [copy.deepcopy(d), eval(repr(d)) ]: self.assertEqual(d, e) self.assertEqual(d.maps, e.maps) self.assertIsNot(d, e) for m1, m2 in zip(d.maps, e.maps): self.assertIsNot(m1, m2, e) f = d.new_child() f['b'] = 5 self.assertEqual(f.maps, [{'b': 5}, {'c':30}, {'a':1, 'b':2}]) self.assertEqual(f.parents.maps, [{'c':30}, {'a':1, 'b':2}]) # check parents self.assertEqual(f['b'], 5) # find first in chain self.assertEqual(f.parents['b'], 2) # look beyond maps[0] def test_constructor(self): self.assertEqual(ChainMap().maps, [{}]) # no-args --> one new dict self.assertEqual(ChainMap({1:2}).maps, [{1:2}]) # 1 arg --> list def test_bool(self): self.assertFalse(ChainMap()) self.assertFalse(ChainMap({}, {})) self.assertTrue(ChainMap({1:2}, {})) self.assertTrue(ChainMap({}, {1:2})) def test_missing(self): class DefaultChainMap(ChainMap): def __missing__(self, key): return 999 d = DefaultChainMap(dict(a=1, b=2), dict(b=20, c=30)) for k, v in dict(a=1, b=2, c=30, d=999).items(): self.assertEqual(d[k], v) # check __getitem__ w/missing for k, v in dict(a=1, b=2, c=30, d=77).items(): self.assertEqual(d.get(k, 77), v) # check get() w/ missing for k, v in dict(a=True, b=True, c=True, d=False).items(): self.assertEqual(k in d, v) # check __contains__ w/missing self.assertEqual(d.pop('a', 1001), 1, d) self.assertEqual(d.pop('a', 1002), 1002) # check pop() w/missing self.assertEqual(d.popitem(), ('b', 2)) # check popitem() w/missing with self.assertRaises(KeyError): d.popitem() def test_dict_coercion(self): d = ChainMap(dict(a=1, b=2), dict(b=20, c=30)) self.assertEqual(dict(d), dict(a=1, b=2, c=30)) self.assertEqual(dict(d.items()), dict(a=1, b=2, c=30)) def test_new_child(self): 'Tests for changes for issue #16613.' c = ChainMap() c['a'] = 1 c['b'] = 2 m = {'b':20, 'c': 30} d = c.new_child(m) self.assertEqual(d.maps, [{'b':20, 'c':30}, {'a':1, 'b':2}]) # check internal state self.assertIs(m, d.maps[0]) # Use a different map than a dict class lowerdict(dict): def __getitem__(self, key): if isinstance(key, str): key = key.lower() return dict.__getitem__(self, key) def __contains__(self, key): if isinstance(key, str): key = key.lower() return dict.__contains__(self, key) c = ChainMap() c['a'] = 1 c['b'] = 2 m = lowerdict(b=20, c=30) d = c.new_child(m) self.assertIs(m, d.maps[0]) for key in 'abc': # check contains self.assertIn(key, d) for k, v in dict(a=1, B=20, C=30, z=100).items(): # check get self.assertEqual(d.get(k, 100), v) ################################################################################ ### Named Tuples ################################################################################ TestNT = namedtuple('TestNT', 'x y z') # type used for pickle tests class TestNamedTuple(unittest.TestCase): def test_factory(self): Point = namedtuple('Point', 'x y') self.assertEqual(Point.__name__, 'Point') self.assertEqual(Point.__slots__, ()) self.assertEqual(Point.__module__, __name__) self.assertEqual(Point.__getitem__, tuple.__getitem__) self.assertEqual(Point._fields, ('x', 'y')) self.assertIn('class Point(tuple)', Point._source) self.assertRaises(ValueError, namedtuple, 'abc%', 'efg ghi') # type has non-alpha char self.assertRaises(ValueError, namedtuple, 'class', 'efg ghi') # type has keyword self.assertRaises(ValueError, namedtuple, '9abc', 'efg ghi') # type starts with digit self.assertRaises(ValueError, namedtuple, 'abc', 'efg g%hi') # field with non-alpha char self.assertRaises(ValueError, namedtuple, 'abc', 'abc class') # field has keyword self.assertRaises(ValueError, namedtuple, 'abc', '8efg 9ghi') # field starts with digit self.assertRaises(ValueError, namedtuple, 'abc', '_efg ghi') # field with leading underscore self.assertRaises(ValueError, namedtuple, 'abc', 'efg efg ghi') # duplicate field namedtuple('Point0', 'x1 y2') # Verify that numbers are allowed in names namedtuple('_', 'a b c') # Test leading underscores in a typename nt = namedtuple('nt', 'the quick brown fox') # check unicode input self.assertNotIn("u'", repr(nt._fields)) nt = namedtuple('nt', ('the', 'quick')) # check unicode input self.assertNotIn("u'", repr(nt._fields)) self.assertRaises(TypeError, Point._make, [11]) # catch too few args self.assertRaises(TypeError, Point._make, [11, 22, 33]) # catch too many args @unittest.skipIf(sys.flags.optimize >= 2, "Docstrings are omitted with -O2 and above") def test_factory_doc_attr(self): Point = namedtuple('Point', 'x y') self.assertEqual(Point.__doc__, 'Point(x, y)') @unittest.skipIf(sys.flags.optimize >= 2, "Docstrings are omitted with -O2 and above") def test_doc_writable(self): Point = namedtuple('Point', 'x y') self.assertEqual(Point.x.__doc__, 'Alias for field number 0') Point.x.__doc__ = 'docstring for Point.x' self.assertEqual(Point.x.__doc__, 'docstring for Point.x') def test_name_fixer(self): for spec, renamed in [ [('efg', 'g%hi'), ('efg', '_1')], # field with non-alpha char [('abc', 'class'), ('abc', '_1')], # field has keyword [('8efg', '9ghi'), ('_0', '_1')], # field starts with digit [('abc', '_efg'), ('abc', '_1')], # field with leading underscore [('abc', 'efg', 'efg', 'ghi'), ('abc', 'efg', '_2', 'ghi')], # duplicate field [('abc', '', 'x'), ('abc', '_1', 'x')], # fieldname is a space ]: self.assertEqual(namedtuple('NT', spec, rename=True)._fields, renamed) def test_instance(self): Point = namedtuple('Point', 'x y') p = Point(11, 22) self.assertEqual(p, Point(x=11, y=22)) self.assertEqual(p, Point(11, y=22)) self.assertEqual(p, Point(y=22, x=11)) self.assertEqual(p, Point(*(11, 22))) self.assertEqual(p, Point(**dict(x=11, y=22))) self.assertRaises(TypeError, Point, 1) # too few args self.assertRaises(TypeError, Point, 1, 2, 3) # too many args self.assertRaises(TypeError, eval, 'Point(XXX=1, y=2)', locals()) # wrong keyword argument self.assertRaises(TypeError, eval, 'Point(x=1)', locals()) # missing keyword argument self.assertEqual(repr(p), 'Point(x=11, y=22)') self.assertNotIn('__weakref__', dir(p)) self.assertEqual(p, Point._make([11, 22])) # test _make classmethod self.assertEqual(p._fields, ('x', 'y')) # test _fields attribute self.assertEqual(p._replace(x=1), (1, 22)) # test _replace method self.assertEqual(p._asdict(), dict(x=11, y=22)) # test _asdict method try: p._replace(x=1, error=2) except ValueError: pass else: self._fail('Did not detect an incorrect fieldname') # verify that field string can have commas Point = namedtuple('Point', 'x, y') p = Point(x=11, y=22) self.assertEqual(repr(p), 'Point(x=11, y=22)') # verify that fieldspec can be a non-string sequence Point = namedtuple('Point', ('x', 'y')) p = Point(x=11, y=22) self.assertEqual(repr(p), 'Point(x=11, y=22)') def test_tupleness(self): Point = namedtuple('Point', 'x y') p = Point(11, 22) self.assertIsInstance(p, tuple) self.assertEqual(p, (11, 22)) # matches a real tuple self.assertEqual(tuple(p), (11, 22)) # coercable to a real tuple self.assertEqual(list(p), [11, 22]) # coercable to a list self.assertEqual(max(p), 22) # iterable self.assertEqual(max(*p), 22) # star-able x, y = p self.assertEqual(p, (x, y)) # unpacks like a tuple self.assertEqual((p[0], p[1]), (11, 22)) # indexable like a tuple self.assertRaises(IndexError, p.__getitem__, 3) self.assertEqual(p.x, x) self.assertEqual(p.y, y) self.assertRaises(AttributeError, eval, 'p.z', locals()) def test_odd_sizes(self): Zero = namedtuple('Zero', '') self.assertEqual(Zero(), ()) self.assertEqual(Zero._make([]), ()) self.assertEqual(repr(Zero()), 'Zero()') self.assertEqual(Zero()._asdict(), {}) self.assertEqual(Zero()._fields, ()) Dot = namedtuple('Dot', 'd') self.assertEqual(Dot(1), (1,)) self.assertEqual(Dot._make([1]), (1,)) self.assertEqual(Dot(1).d, 1) self.assertEqual(repr(Dot(1)), 'Dot(d=1)') self.assertEqual(Dot(1)._asdict(), {'d':1}) self.assertEqual(Dot(1)._replace(d=999), (999,)) self.assertEqual(Dot(1)._fields, ('d',)) # n = 5000 n = 254 # SyntaxError: more than 255 arguments: names = list(set(''.join([choice(string.ascii_letters) for j in range(10)]) for i in range(n))) n = len(names) Big = namedtuple('Big', names) b = Big(*range(n)) self.assertEqual(b, tuple(range(n))) self.assertEqual(Big._make(range(n)), tuple(range(n))) for pos, name in enumerate(names): self.assertEqual(getattr(b, name), pos) repr(b) # make sure repr() doesn't blow-up d = b._asdict() d_expected = dict(zip(names, range(n))) self.assertEqual(d, d_expected) b2 = b._replace(**dict([(names[1], 999),(names[-5], 42)])) b2_expected = list(range(n)) b2_expected[1] = 999 b2_expected[-5] = 42 self.assertEqual(b2, tuple(b2_expected)) self.assertEqual(b._fields, tuple(names)) def test_pickle(self): p = TestNT(x=10, y=20, z=30) for module in (pickle,): loads = getattr(module, 'loads') dumps = getattr(module, 'dumps') for protocol in range(-1, module.HIGHEST_PROTOCOL + 1): q = loads(dumps(p, protocol)) self.assertEqual(p, q) self.assertEqual(p._fields, q._fields) self.assertNotIn(b'OrderedDict', dumps(p, protocol)) def test_copy(self): p = TestNT(x=10, y=20, z=30) for copier in copy.copy, copy.deepcopy: q = copier(p) self.assertEqual(p, q) self.assertEqual(p._fields, q._fields) def test_name_conflicts(self): # Some names like "self", "cls", "tuple", "itemgetter", and "property" # failed when used as field names. Test to make sure these now work. T = namedtuple('T', 'itemgetter property self cls tuple') t = T(1, 2, 3, 4, 5) self.assertEqual(t, (1,2,3,4,5)) newt = t._replace(itemgetter=10, property=20, self=30, cls=40, tuple=50) self.assertEqual(newt, (10,20,30,40,50)) # Broader test of all interesting names in a template with support.captured_stdout() as template: T = namedtuple('T', 'x', verbose=True) words = set(re.findall('[A-Za-z]+', template.getvalue())) words -= set(keyword.kwlist) T = namedtuple('T', words) # test __new__ values = tuple(range(len(words))) t = T(*values) self.assertEqual(t, values) t = T(**dict(zip(T._fields, values))) self.assertEqual(t, values) # test _make t = T._make(values) self.assertEqual(t, values) # exercise __repr__ repr(t) # test _asdict self.assertEqual(t._asdict(), dict(zip(T._fields, values))) # test _replace t = T._make(values) newvalues = tuple(v*10 for v in values) newt = t._replace(**dict(zip(T._fields, newvalues))) self.assertEqual(newt, newvalues) # test _fields self.assertEqual(T._fields, tuple(words)) # test __getnewargs__ self.assertEqual(t.__getnewargs__(), values) def test_repr(self): with support.captured_stdout() as template: A = namedtuple('A', 'x', verbose=True) self.assertEqual(repr(A(1)), 'A(x=1)') # repr should show the name of the subclass class B(A): pass self.assertEqual(repr(B(1)), 'B(x=1)') def test_source(self): # verify that _source can be run through exec() tmp = namedtuple('NTColor', 'red green blue') globals().pop('NTColor', None) # remove artifacts from other tests exec(tmp._source, globals()) self.assertIn('NTColor', globals()) c = NTColor(10, 20, 30) self.assertEqual((c.red, c.green, c.blue), (10, 20, 30)) self.assertEqual(NTColor._fields, ('red', 'green', 'blue')) globals().pop('NTColor', None) # clean-up after this test def test_keyword_only_arguments(self): # See issue 25628 with support.captured_stdout() as template: NT = namedtuple('NT', ['x', 'y'], verbose=True) self.assertIn('class NT', NT._source) with self.assertRaises(TypeError): NT = namedtuple('NT', ['x', 'y'], True) NT = namedtuple('NT', ['abc', 'def'], rename=True) self.assertEqual(NT._fields, ('abc', '_1')) with self.assertRaises(TypeError): NT = namedtuple('NT', ['abc', 'def'], False, True) def test_namedtuple_subclass_issue_24931(self): class Point(namedtuple('_Point', ['x', 'y'])): pass a = Point(3, 4) self.assertEqual(a._asdict(), OrderedDict([('x', 3), ('y', 4)])) a.w = 5 self.assertEqual(a.__dict__, {'w': 5}) ################################################################################ ### Abstract Base Classes ################################################################################ class ABCTestCase(unittest.TestCase): def validate_abstract_methods(self, abc, *names): methodstubs = dict.fromkeys(names, lambda s, *args: 0) # everything should work will all required methods are present C = type('C', (abc,), methodstubs) C() # instantiation should fail if a required method is missing for name in names: stubs = methodstubs.copy() del stubs[name] C = type('C', (abc,), stubs) self.assertRaises(TypeError, C, name) def validate_isinstance(self, abc, name): stub = lambda s, *args: 0 C = type('C', (object,), {'__hash__': None}) setattr(C, name, stub) self.assertIsInstance(C(), abc) self.assertTrue(issubclass(C, abc)) C = type('C', (object,), {'__hash__': None}) self.assertNotIsInstance(C(), abc) self.assertFalse(issubclass(C, abc)) def validate_comparison(self, instance): ops = ['lt', 'gt', 'le', 'ge', 'ne', 'or', 'and', 'xor', 'sub'] operators = {} for op in ops: name = '__' + op + '__' operators[name] = getattr(operator, name) class Other: def __init__(self): self.right_side = False def __eq__(self, other): self.right_side = True return True __lt__ = __eq__ __gt__ = __eq__ __le__ = __eq__ __ge__ = __eq__ __ne__ = __eq__ __ror__ = __eq__ __rand__ = __eq__ __rxor__ = __eq__ __rsub__ = __eq__ for name, op in operators.items(): if not hasattr(instance, name): continue other = Other() op(instance, other) self.assertTrue(other.right_side,'Right side not called for %s.%s' % (type(instance), name)) def _test_gen(): yield class TestOneTrickPonyABCs(ABCTestCase): def test_Awaitable(self): def gen(): yield @types.coroutine def coro(): yield async def new_coro(): pass class Bar: def __await__(self): yield class MinimalCoro(Coroutine): def send(self, value): return value def throw(self, typ, val=None, tb=None): super().throw(typ, val, tb) def __await__(self): yield non_samples = [None, int(), gen(), object()] for x in non_samples: self.assertNotIsInstance(x, Awaitable) self.assertFalse(issubclass(type(x), Awaitable), repr(type(x))) samples = [Bar(), MinimalCoro()] for x in samples: self.assertIsInstance(x, Awaitable) self.assertTrue(issubclass(type(x), Awaitable)) c = coro() # Iterable coroutines (generators with CO_ITERABLE_COROUTINE # flag don't have '__await__' method, hence can't be instances # of Awaitable. Use inspect.isawaitable to detect them. self.assertNotIsInstance(c, Awaitable) c = new_coro() self.assertIsInstance(c, Awaitable) c.close() # awoid RuntimeWarning that coro() was not awaited class CoroLike: pass Coroutine.register(CoroLike) self.assertTrue(isinstance(CoroLike(), Awaitable)) self.assertTrue(issubclass(CoroLike, Awaitable)) CoroLike = None support.gc_collect() # Kill CoroLike to clean-up ABCMeta cache def test_Coroutine(self): def gen(): yield @types.coroutine def coro(): yield async def new_coro(): pass class Bar: def __await__(self): yield class MinimalCoro(Coroutine): def send(self, value): return value def throw(self, typ, val=None, tb=None): super().throw(typ, val, tb) def __await__(self): yield non_samples = [None, int(), gen(), object(), Bar()] for x in non_samples: self.assertNotIsInstance(x, Coroutine) self.assertFalse(issubclass(type(x), Coroutine), repr(type(x))) samples = [MinimalCoro()] for x in samples: self.assertIsInstance(x, Awaitable) self.assertTrue(issubclass(type(x), Awaitable)) c = coro() # Iterable coroutines (generators with CO_ITERABLE_COROUTINE # flag don't have '__await__' method, hence can't be instances # of Coroutine. Use inspect.isawaitable to detect them. self.assertNotIsInstance(c, Coroutine) c = new_coro() self.assertIsInstance(c, Coroutine) c.close() # awoid RuntimeWarning that coro() was not awaited class CoroLike: def send(self, value): pass def throw(self, typ, val=None, tb=None): pass def close(self): pass def __await__(self): pass self.assertTrue(isinstance(CoroLike(), Coroutine)) self.assertTrue(issubclass(CoroLike, Coroutine)) class CoroLike: def send(self, value): pass def close(self): pass def __await__(self): pass self.assertFalse(isinstance(CoroLike(), Coroutine)) self.assertFalse(issubclass(CoroLike, Coroutine)) def test_Hashable(self): # Check some non-hashables non_samples = [bytearray(), list(), set(), dict()] for x in non_samples: self.assertNotIsInstance(x, Hashable) self.assertFalse(issubclass(type(x), Hashable), repr(type(x))) # Check some hashables samples = [None, int(), float(), complex(), str(), tuple(), frozenset(), int, list, object, type, bytes() ] for x in samples: self.assertIsInstance(x, Hashable) self.assertTrue(issubclass(type(x), Hashable), repr(type(x))) self.assertRaises(TypeError, Hashable) # Check direct subclassing class H(Hashable): def __hash__(self): return super().__hash__() self.assertEqual(hash(H()), 0) self.assertFalse(issubclass(int, H)) self.validate_abstract_methods(Hashable, '__hash__') self.validate_isinstance(Hashable, '__hash__') def test_AsyncIterable(self): class AI: async def __aiter__(self): return self self.assertTrue(isinstance(AI(), AsyncIterable)) self.assertTrue(issubclass(AI, AsyncIterable)) # Check some non-iterables non_samples = [None, object, []] for x in non_samples: self.assertNotIsInstance(x, AsyncIterable) self.assertFalse(issubclass(type(x), AsyncIterable), repr(type(x))) self.validate_abstract_methods(AsyncIterable, '__aiter__') self.validate_isinstance(AsyncIterable, '__aiter__') def test_AsyncIterator(self): class AI: async def __aiter__(self): return self async def __anext__(self): raise StopAsyncIteration self.assertTrue(isinstance(AI(), AsyncIterator)) self.assertTrue(issubclass(AI, AsyncIterator)) non_samples = [None, object, []] # Check some non-iterables for x in non_samples: self.assertNotIsInstance(x, AsyncIterator) self.assertFalse(issubclass(type(x), AsyncIterator), repr(type(x))) # Similarly to regular iterators (see issue 10565) class AnextOnly: async def __anext__(self): raise StopAsyncIteration self.assertNotIsInstance(AnextOnly(), AsyncIterator) self.validate_abstract_methods(AsyncIterator, '__anext__', '__aiter__') def test_Iterable(self): # Check some non-iterables non_samples = [None, 42, 3.14, 1j] for x in non_samples: self.assertNotIsInstance(x, Iterable) self.assertFalse(issubclass(type(x), Iterable), repr(type(x))) # Check some iterables samples = [bytes(), str(), tuple(), list(), set(), frozenset(), dict(), dict().keys(), dict().items(), dict().values(), _test_gen(), (x for x in []), ] for x in samples: self.assertIsInstance(x, Iterable) self.assertTrue(issubclass(type(x), Iterable), repr(type(x))) # Check direct subclassing class I(Iterable): def __iter__(self): return super().__iter__() self.assertEqual(list(I()), []) self.assertFalse(issubclass(str, I)) self.validate_abstract_methods(Iterable, '__iter__') self.validate_isinstance(Iterable, '__iter__') # Check None blocking class It: def __iter__(self): return iter([]) class ItBlocked(It): __iter__ = None self.assertTrue(issubclass(It, Iterable)) self.assertTrue(isinstance(It(), Iterable)) self.assertFalse(issubclass(ItBlocked, Iterable)) self.assertFalse(isinstance(ItBlocked(), Iterable)) def test_Reversible(self): # Check some non-reversibles non_samples = [None, 42, 3.14, 1j, dict(), set(), frozenset()] for x in non_samples: self.assertNotIsInstance(x, Reversible) self.assertFalse(issubclass(type(x), Reversible), repr(type(x))) # Check some non-reversible iterables non_reversibles = [dict().keys(), dict().items(), dict().values(), Counter(), Counter().keys(), Counter().items(), Counter().values(), _test_gen(), (x for x in []), iter([]), reversed([])] for x in non_reversibles: self.assertNotIsInstance(x, Reversible) self.assertFalse(issubclass(type(x), Reversible), repr(type(x))) # Check some reversible iterables samples = [bytes(), str(), tuple(), list(), OrderedDict(), OrderedDict().keys(), OrderedDict().items(), OrderedDict().values()] for x in samples: self.assertIsInstance(x, Reversible) self.assertTrue(issubclass(type(x), Reversible), repr(type(x))) # Check also Mapping, MutableMapping, and Sequence self.assertTrue(issubclass(Sequence, Reversible), repr(Sequence)) self.assertFalse(issubclass(Mapping, Reversible), repr(Mapping)) self.assertFalse(issubclass(MutableMapping, Reversible), repr(MutableMapping)) # Check direct subclassing class R(Reversible): def __iter__(self): return iter(list()) def __reversed__(self): return iter(list()) self.assertEqual(list(reversed(R())), []) self.assertFalse(issubclass(float, R)) self.validate_abstract_methods(Reversible, '__reversed__', '__iter__') # Check reversible non-iterable (which is not Reversible) class RevNoIter: def __reversed__(self): return reversed([]) class RevPlusIter(RevNoIter): def __iter__(self): return iter([]) self.assertFalse(issubclass(RevNoIter, Reversible)) self.assertFalse(isinstance(RevNoIter(), Reversible)) self.assertTrue(issubclass(RevPlusIter, Reversible)) self.assertTrue(isinstance(RevPlusIter(), Reversible)) # Check None blocking class Rev: def __iter__(self): return iter([]) def __reversed__(self): return reversed([]) class RevItBlocked(Rev): __iter__ = None class RevRevBlocked(Rev): __reversed__ = None self.assertTrue(issubclass(Rev, Reversible)) self.assertTrue(isinstance(Rev(), Reversible)) self.assertFalse(issubclass(RevItBlocked, Reversible)) self.assertFalse(isinstance(RevItBlocked(), Reversible)) self.assertFalse(issubclass(RevRevBlocked, Reversible)) self.assertFalse(isinstance(RevRevBlocked(), Reversible)) def test_Collection(self): # Check some non-collections non_collections = [None, 42, 3.14, 1j, lambda x: 2*x] for x in non_collections: self.assertNotIsInstance(x, Collection) self.assertFalse(issubclass(type(x), Collection), repr(type(x))) # Check some non-collection iterables non_col_iterables = [_test_gen(), iter(b''), iter(bytearray()), (x for x in []), dict().values()] for x in non_col_iterables: self.assertNotIsInstance(x, Collection) self.assertFalse(issubclass(type(x), Collection), repr(type(x))) # Check some collections samples = [set(), frozenset(), dict(), bytes(), str(), tuple(), list(), dict().keys(), dict().items()] for x in samples: self.assertIsInstance(x, Collection) self.assertTrue(issubclass(type(x), Collection), repr(type(x))) # Check also Mapping, MutableMapping, etc. self.assertTrue(issubclass(Sequence, Collection), repr(Sequence)) self.assertTrue(issubclass(Mapping, Collection), repr(Mapping)) self.assertTrue(issubclass(MutableMapping, Collection), repr(MutableMapping)) self.assertTrue(issubclass(Set, Collection), repr(Set)) self.assertTrue(issubclass(MutableSet, Collection), repr(MutableSet)) self.assertTrue(issubclass(Sequence, Collection), repr(MutableSet)) # Check direct subclassing class Col(Collection): def __iter__(self): return iter(list()) def __len__(self): return 0 def __contains__(self, item): return False class DerCol(Col): pass self.assertEqual(list(iter(Col())), []) self.assertFalse(issubclass(list, Col)) self.assertFalse(issubclass(set, Col)) self.assertFalse(issubclass(float, Col)) self.assertEqual(list(iter(DerCol())), []) self.assertFalse(issubclass(list, DerCol)) self.assertFalse(issubclass(set, DerCol)) self.assertFalse(issubclass(float, DerCol)) self.validate_abstract_methods(Collection, '__len__', '__iter__', '__contains__') # Check sized container non-iterable (which is not Collection) etc. class ColNoIter: def __len__(self): return 0 def __contains__(self, item): return False class ColNoSize: def __iter__(self): return iter([]) def __contains__(self, item): return False class ColNoCont: def __iter__(self): return iter([]) def __len__(self): return 0 self.assertFalse(issubclass(ColNoIter, Collection)) self.assertFalse(isinstance(ColNoIter(), Collection)) self.assertFalse(issubclass(ColNoSize, Collection)) self.assertFalse(isinstance(ColNoSize(), Collection)) self.assertFalse(issubclass(ColNoCont, Collection)) self.assertFalse(isinstance(ColNoCont(), Collection)) # Check None blocking class SizeBlock: def __iter__(self): return iter([]) def __contains__(self): return False __len__ = None class IterBlock: def __len__(self): return 0 def __contains__(self): return True __iter__ = None self.assertFalse(issubclass(SizeBlock, Collection)) self.assertFalse(isinstance(SizeBlock(), Collection)) self.assertFalse(issubclass(IterBlock, Collection)) self.assertFalse(isinstance(IterBlock(), Collection)) # Check None blocking in subclass class ColImpl: def __iter__(self): return iter(list()) def __len__(self): return 0 def __contains__(self, item): return False class NonCol(ColImpl): __contains__ = None self.assertFalse(issubclass(NonCol, Collection)) self.assertFalse(isinstance(NonCol(), Collection)) def test_Iterator(self): non_samples = [None, 42, 3.14, 1j, b"", "", (), [], {}, set()] for x in non_samples: self.assertNotIsInstance(x, Iterator) self.assertFalse(issubclass(type(x), Iterator), repr(type(x))) samples = [iter(bytes()), iter(str()), iter(tuple()), iter(list()), iter(dict()), iter(set()), iter(frozenset()), iter(dict().keys()), iter(dict().items()), iter(dict().values()), _test_gen(), (x for x in []), ] for x in samples: self.assertIsInstance(x, Iterator) self.assertTrue(issubclass(type(x), Iterator), repr(type(x))) self.validate_abstract_methods(Iterator, '__next__', '__iter__') # Issue 10565 class NextOnly: def __next__(self): yield 1 return self.assertNotIsInstance(NextOnly(), Iterator) def test_Generator(self): class NonGen1: def __iter__(self): return self def __next__(self): return None def close(self): pass def throw(self, typ, val=None, tb=None): pass class NonGen2: def __iter__(self): return self def __next__(self): return None def close(self): pass def send(self, value): return value class NonGen3: def close(self): pass def send(self, value): return value def throw(self, typ, val=None, tb=None): pass non_samples = [ None, 42, 3.14, 1j, b"", "", (), [], {}, set(), iter(()), iter([]), NonGen1(), NonGen2(), NonGen3()] for x in non_samples: self.assertNotIsInstance(x, Generator) self.assertFalse(issubclass(type(x), Generator), repr(type(x))) class Gen: def __iter__(self): return self def __next__(self): return None def close(self): pass def send(self, value): return value def throw(self, typ, val=None, tb=None): pass class MinimalGen(Generator): def send(self, value): return value def throw(self, typ, val=None, tb=None): super().throw(typ, val, tb) def gen(): yield 1 samples = [gen(), (lambda: (yield))(), Gen(), MinimalGen()] for x in samples: self.assertIsInstance(x, Iterator) self.assertIsInstance(x, Generator) self.assertTrue(issubclass(type(x), Generator), repr(type(x))) self.validate_abstract_methods(Generator, 'send', 'throw') # mixin tests mgen = MinimalGen() self.assertIs(mgen, iter(mgen)) self.assertIs(mgen.send(None), next(mgen)) self.assertEqual(2, mgen.send(2)) self.assertIsNone(mgen.close()) self.assertRaises(ValueError, mgen.throw, ValueError) self.assertRaisesRegex(ValueError, "^huhu$", mgen.throw, ValueError, ValueError("huhu")) self.assertRaises(StopIteration, mgen.throw, StopIteration()) class FailOnClose(Generator): def send(self, value): return value def throw(self, *args): raise ValueError self.assertRaises(ValueError, FailOnClose().close) class IgnoreGeneratorExit(Generator): def send(self, value): return value def throw(self, *args): pass self.assertRaises(RuntimeError, IgnoreGeneratorExit().close) def test_Sized(self): non_samples = [None, 42, 3.14, 1j, _test_gen(), (x for x in []), ] for x in non_samples: self.assertNotIsInstance(x, Sized) self.assertFalse(issubclass(type(x), Sized), repr(type(x))) samples = [bytes(), str(), tuple(), list(), set(), frozenset(), dict(), dict().keys(), dict().items(), dict().values(), ] for x in samples: self.assertIsInstance(x, Sized) self.assertTrue(issubclass(type(x), Sized), repr(type(x))) self.validate_abstract_methods(Sized, '__len__') self.validate_isinstance(Sized, '__len__') def test_Container(self): non_samples = [None, 42, 3.14, 1j, _test_gen(), (x for x in []), ] for x in non_samples: self.assertNotIsInstance(x, Container) self.assertFalse(issubclass(type(x), Container), repr(type(x))) samples = [bytes(), str(), tuple(), list(), set(), frozenset(), dict(), dict().keys(), dict().items(), ] for x in samples: self.assertIsInstance(x, Container) self.assertTrue(issubclass(type(x), Container), repr(type(x))) self.validate_abstract_methods(Container, '__contains__') self.validate_isinstance(Container, '__contains__') def test_Callable(self): non_samples = [None, 42, 3.14, 1j, "", b"", (), [], {}, set(), _test_gen(), (x for x in []), ] for x in non_samples: self.assertNotIsInstance(x, Callable) self.assertFalse(issubclass(type(x), Callable), repr(type(x))) samples = [lambda: None, type, int, object, len, list.append, [].append, ] for x in samples: self.assertIsInstance(x, Callable) self.assertTrue(issubclass(type(x), Callable), repr(type(x))) self.validate_abstract_methods(Callable, '__call__') self.validate_isinstance(Callable, '__call__') def test_direct_subclassing(self): for B in Hashable, Iterable, Iterator, Reversible, Sized, Container, Callable: class C(B): pass self.assertTrue(issubclass(C, B)) self.assertFalse(issubclass(int, C)) def test_registration(self): for B in Hashable, Iterable, Iterator, Reversible, Sized, Container, Callable: class C: __hash__ = None # Make sure it isn't hashable by default self.assertFalse(issubclass(C, B), B.__name__) B.register(C) self.assertTrue(issubclass(C, B)) class WithSet(MutableSet): def __init__(self, it=()): self.data = set(it) def __len__(self): return len(self.data) def __iter__(self): return iter(self.data) def __contains__(self, item): return item in self.data def add(self, item): self.data.add(item) def discard(self, item): self.data.discard(item) class TestCollectionABCs(ABCTestCase): # XXX For now, we only test some virtual inheritance properties. # We should also test the proper behavior of the collection ABCs # as real base classes or mix-in classes. def test_Set(self): for sample in [set, frozenset]: self.assertIsInstance(sample(), Set) self.assertTrue(issubclass(sample, Set)) self.validate_abstract_methods(Set, '__contains__', '__iter__', '__len__') class MySet(Set): def __contains__(self, x): return False def __len__(self): return 0 def __iter__(self): return iter([]) self.validate_comparison(MySet()) def test_hash_Set(self): class OneTwoThreeSet(Set): def __init__(self): self.contents = [1, 2, 3] def __contains__(self, x): return x in self.contents def __len__(self): return len(self.contents) def __iter__(self): return iter(self.contents) def __hash__(self): return self._hash() a, b = OneTwoThreeSet(), OneTwoThreeSet() self.assertTrue(hash(a) == hash(b)) def test_isdisjoint_Set(self): class MySet(Set): def __init__(self, itr): self.contents = itr def __contains__(self, x): return x in self.contents def __iter__(self): return iter(self.contents) def __len__(self): return len([x for x in self.contents]) s1 = MySet((1, 2, 3)) s2 = MySet((4, 5, 6)) s3 = MySet((1, 5, 6)) self.assertTrue(s1.isdisjoint(s2)) self.assertFalse(s1.isdisjoint(s3)) def test_equality_Set(self): class MySet(Set): def __init__(self, itr): self.contents = itr def __contains__(self, x): return x in self.contents def __iter__(self): return iter(self.contents) def __len__(self): return len([x for x in self.contents]) s1 = MySet((1,)) s2 = MySet((1, 2)) s3 = MySet((3, 4)) s4 = MySet((3, 4)) self.assertTrue(s2 > s1) self.assertTrue(s1 < s2) self.assertFalse(s2 <= s1) self.assertFalse(s2 <= s3) self.assertFalse(s1 >= s2) self.assertEqual(s3, s4) self.assertNotEqual(s2, s3) def test_arithmetic_Set(self): class MySet(Set): def __init__(self, itr): self.contents = itr def __contains__(self, x): return x in self.contents def __iter__(self): return iter(self.contents) def __len__(self): return len([x for x in self.contents]) s1 = MySet((1, 2, 3)) s2 = MySet((3, 4, 5)) s3 = s1 & s2 self.assertEqual(s3, MySet((3,))) def test_MutableSet(self): self.assertIsInstance(set(), MutableSet) self.assertTrue(issubclass(set, MutableSet)) self.assertNotIsInstance(frozenset(), MutableSet) self.assertFalse(issubclass(frozenset, MutableSet)) self.validate_abstract_methods(MutableSet, '__contains__', '__iter__', '__len__', 'add', 'discard') def test_issue_5647(self): # MutableSet.__iand__ mutated the set during iteration s = WithSet('abcd') s &= WithSet('cdef') # This used to fail self.assertEqual(set(s), set('cd')) def test_issue_4920(self): # MutableSet.pop() method did not work class MySet(MutableSet): __slots__=['__s'] def __init__(self,items=None): if items is None: items=[] self.__s=set(items) def __contains__(self,v): return v in self.__s def __iter__(self): return iter(self.__s) def __len__(self): return len(self.__s) def add(self,v): result=v not in self.__s self.__s.add(v) return result def discard(self,v): result=v in self.__s self.__s.discard(v) return result def __repr__(self): return "MySet(%s)" % repr(list(self)) s = MySet([5,43,2,1]) self.assertEqual(s.pop(), 1) def test_issue8750(self): empty = WithSet() full = WithSet(range(10)) s = WithSet(full) s -= s self.assertEqual(s, empty) s = WithSet(full) s ^= s self.assertEqual(s, empty) s = WithSet(full) s &= s self.assertEqual(s, full) s |= s self.assertEqual(s, full) def test_issue16373(self): # Recursion error comparing comparable and noncomparable # Set instances class MyComparableSet(Set): def __contains__(self, x): return False def __len__(self): return 0 def __iter__(self): return iter([]) class MyNonComparableSet(Set): def __contains__(self, x): return False def __len__(self): return 0 def __iter__(self): return iter([]) def __le__(self, x): return NotImplemented def __lt__(self, x): return NotImplemented cs = MyComparableSet() ncs = MyNonComparableSet() self.assertFalse(ncs < cs) self.assertTrue(ncs <= cs) self.assertFalse(ncs > cs) self.assertTrue(ncs >= cs) def test_issue26915(self): # Container membership test should check identity first class CustomEqualObject: def __eq__(self, other): return False class CustomSequence(list): def __contains__(self, value): return Sequence.__contains__(self, value) nan = float('nan') obj = CustomEqualObject() containers = [ CustomSequence([nan, obj]), ItemsView({1: nan, 2: obj}), ValuesView({1: nan, 2: obj}) ] for container in containers: for elem in container: self.assertIn(elem, container) def assertSameSet(self, s1, s2): # coerce both to a real set then check equality self.assertSetEqual(set(s1), set(s2)) def test_Set_interoperability_with_real_sets(self): # Issue: 8743 class ListSet(Set): def __init__(self, elements=()): self.data = [] for elem in elements: if elem not in self.data: self.data.append(elem) def __contains__(self, elem): return elem in self.data def __iter__(self): return iter(self.data) def __len__(self): return len(self.data) def __repr__(self): return 'Set({!r})'.format(self.data) r1 = set('abc') r2 = set('bcd') r3 = set('abcde') f1 = ListSet('abc') f2 = ListSet('bcd') f3 = ListSet('abcde') l1 = list('abccba') l2 = list('bcddcb') l3 = list('abcdeedcba') target = r1 & r2 self.assertSameSet(f1 & f2, target) self.assertSameSet(f1 & r2, target) self.assertSameSet(r2 & f1, target) self.assertSameSet(f1 & l2, target) target = r1 | r2 self.assertSameSet(f1 | f2, target) self.assertSameSet(f1 | r2, target) self.assertSameSet(r2 | f1, target) self.assertSameSet(f1 | l2, target) fwd_target = r1 - r2 rev_target = r2 - r1 self.assertSameSet(f1 - f2, fwd_target) self.assertSameSet(f2 - f1, rev_target) self.assertSameSet(f1 - r2, fwd_target) self.assertSameSet(f2 - r1, rev_target) self.assertSameSet(r1 - f2, fwd_target) self.assertSameSet(r2 - f1, rev_target) self.assertSameSet(f1 - l2, fwd_target) self.assertSameSet(f2 - l1, rev_target) target = r1 ^ r2 self.assertSameSet(f1 ^ f2, target) self.assertSameSet(f1 ^ r2, target) self.assertSameSet(r2 ^ f1, target) self.assertSameSet(f1 ^ l2, target) # Don't change the following to use assertLess or other # "more specific" unittest assertions. The current # assertTrue/assertFalse style makes the pattern of test # case combinations clear and allows us to know for sure # the exact operator being invoked. # proper subset self.assertTrue(f1 < f3) self.assertFalse(f1 < f1) self.assertFalse(f1 < f2) self.assertTrue(r1 < f3) self.assertFalse(r1 < f1) self.assertFalse(r1 < f2) self.assertTrue(r1 < r3) self.assertFalse(r1 < r1) self.assertFalse(r1 < r2) with self.assertRaises(TypeError): f1 < l3 with self.assertRaises(TypeError): f1 < l1 with self.assertRaises(TypeError): f1 < l2 # any subset self.assertTrue(f1 <= f3) self.assertTrue(f1 <= f1) self.assertFalse(f1 <= f2) self.assertTrue(r1 <= f3) self.assertTrue(r1 <= f1) self.assertFalse(r1 <= f2) self.assertTrue(r1 <= r3) self.assertTrue(r1 <= r1) self.assertFalse(r1 <= r2) with self.assertRaises(TypeError): f1 <= l3 with self.assertRaises(TypeError): f1 <= l1 with self.assertRaises(TypeError): f1 <= l2 # proper superset self.assertTrue(f3 > f1) self.assertFalse(f1 > f1) self.assertFalse(f2 > f1) self.assertTrue(r3 > r1) self.assertFalse(f1 > r1) self.assertFalse(f2 > r1) self.assertTrue(r3 > r1) self.assertFalse(r1 > r1) self.assertFalse(r2 > r1) with self.assertRaises(TypeError): f1 > l3 with self.assertRaises(TypeError): f1 > l1 with self.assertRaises(TypeError): f1 > l2 # any superset self.assertTrue(f3 >= f1) self.assertTrue(f1 >= f1) self.assertFalse(f2 >= f1) self.assertTrue(r3 >= r1) self.assertTrue(f1 >= r1) self.assertFalse(f2 >= r1) self.assertTrue(r3 >= r1) self.assertTrue(r1 >= r1) self.assertFalse(r2 >= r1) with self.assertRaises(TypeError): f1 >= l3 with self.assertRaises(TypeError): f1 >=l1 with self.assertRaises(TypeError): f1 >= l2 # equality self.assertTrue(f1 == f1) self.assertTrue(r1 == f1) self.assertTrue(f1 == r1) self.assertFalse(f1 == f3) self.assertFalse(r1 == f3) self.assertFalse(f1 == r3) self.assertFalse(f1 == l3) self.assertFalse(f1 == l1) self.assertFalse(f1 == l2) # inequality self.assertFalse(f1 != f1) self.assertFalse(r1 != f1) self.assertFalse(f1 != r1) self.assertTrue(f1 != f3) self.assertTrue(r1 != f3) self.assertTrue(f1 != r3) self.assertTrue(f1 != l3) self.assertTrue(f1 != l1) self.assertTrue(f1 != l2) def test_Mapping(self): for sample in [dict]: self.assertIsInstance(sample(), Mapping) self.assertTrue(issubclass(sample, Mapping)) self.validate_abstract_methods(Mapping, '__contains__', '__iter__', '__len__', '__getitem__') class MyMapping(Mapping): def __len__(self): return 0 def __getitem__(self, i): raise IndexError def __iter__(self): return iter(()) self.validate_comparison(MyMapping()) self.assertRaises(TypeError, reversed, MyMapping()) def test_MutableMapping(self): for sample in [dict]: self.assertIsInstance(sample(), MutableMapping) self.assertTrue(issubclass(sample, MutableMapping)) self.validate_abstract_methods(MutableMapping, '__contains__', '__iter__', '__len__', '__getitem__', '__setitem__', '__delitem__') def test_MutableMapping_subclass(self): # Test issue 9214 mymap = UserDict() mymap['red'] = 5 self.assertIsInstance(mymap.keys(), Set) self.assertIsInstance(mymap.keys(), KeysView) self.assertIsInstance(mymap.items(), Set) self.assertIsInstance(mymap.items(), ItemsView) mymap = UserDict() mymap['red'] = 5 z = mymap.keys() | {'orange'} self.assertIsInstance(z, set) list(z) mymap['blue'] = 7 # Shouldn't affect 'z' self.assertEqual(sorted(z), ['orange', 'red']) mymap = UserDict() mymap['red'] = 5 z = mymap.items() | {('orange', 3)} self.assertIsInstance(z, set) list(z) mymap['blue'] = 7 # Shouldn't affect 'z' self.assertEqual(sorted(z), [('orange', 3), ('red', 5)]) def test_Sequence(self): for sample in [tuple, list, bytes, str]: self.assertIsInstance(sample(), Sequence) self.assertTrue(issubclass(sample, Sequence)) self.assertIsInstance(range(10), Sequence) self.assertTrue(issubclass(range, Sequence)) self.assertIsInstance(memoryview(b""), Sequence) self.assertTrue(issubclass(memoryview, Sequence)) self.assertTrue(issubclass(str, Sequence)) self.validate_abstract_methods(Sequence, '__contains__', '__iter__', '__len__', '__getitem__') def test_Sequence_mixins(self): class SequenceSubclass(Sequence): def __init__(self, seq=()): self.seq = seq def __getitem__(self, index): return self.seq[index] def __len__(self): return len(self.seq) # Compare Sequence.index() behavior to (list|str).index() behavior def assert_index_same(seq1, seq2, index_args): try: expected = seq1.index(*index_args) except ValueError: with self.assertRaises(ValueError): seq2.index(*index_args) else: actual = seq2.index(*index_args) self.assertEqual( actual, expected, '%r.index%s' % (seq1, index_args)) for ty in list, str: nativeseq = ty('abracadabra') indexes = [-10000, -9999] + list(range(-3, len(nativeseq) + 3)) seqseq = SequenceSubclass(nativeseq) for letter in set(nativeseq) | {'z'}: assert_index_same(nativeseq, seqseq, (letter,)) for start in range(-3, len(nativeseq) + 3): assert_index_same(nativeseq, seqseq, (letter, start)) for stop in range(-3, len(nativeseq) + 3): assert_index_same( nativeseq, seqseq, (letter, start, stop)) def test_ByteString(self): for sample in [bytes, bytearray]: self.assertIsInstance(sample(), ByteString) self.assertTrue(issubclass(sample, ByteString)) for sample in [str, list, tuple]: self.assertNotIsInstance(sample(), ByteString) self.assertFalse(issubclass(sample, ByteString)) self.assertNotIsInstance(memoryview(b""), ByteString) self.assertFalse(issubclass(memoryview, ByteString)) def test_MutableSequence(self): for sample in [tuple, str, bytes]: self.assertNotIsInstance(sample(), MutableSequence) self.assertFalse(issubclass(sample, MutableSequence)) for sample in [list, bytearray, deque]: self.assertIsInstance(sample(), MutableSequence) self.assertTrue(issubclass(sample, MutableSequence)) self.assertFalse(issubclass(str, MutableSequence)) self.validate_abstract_methods(MutableSequence, '__contains__', '__iter__', '__len__', '__getitem__', '__setitem__', '__delitem__', 'insert') def test_MutableSequence_mixins(self): # Test the mixins of MutableSequence by creating a miminal concrete # class inherited from it. class MutableSequenceSubclass(MutableSequence): def __init__(self): self.lst = [] def __setitem__(self, index, value): self.lst[index] = value def __getitem__(self, index): return self.lst[index] def __len__(self): return len(self.lst) def __delitem__(self, index): del self.lst[index] def insert(self, index, value): self.lst.insert(index, value) mss = MutableSequenceSubclass() mss.append(0) mss.extend((1, 2, 3, 4)) self.assertEqual(len(mss), 5) self.assertEqual(mss[3], 3) mss.reverse() self.assertEqual(mss[3], 1) mss.pop() self.assertEqual(len(mss), 4) mss.remove(3) self.assertEqual(len(mss), 3) mss += (10, 20, 30) self.assertEqual(len(mss), 6) self.assertEqual(mss[-1], 30) mss.clear() self.assertEqual(len(mss), 0) ################################################################################ ### Counter ################################################################################ class CounterSubclassWithSetItem(Counter): # Test a counter subclass that overrides __setitem__ def __init__(self, *args, **kwds): self.called = False Counter.__init__(self, *args, **kwds) def __setitem__(self, key, value): self.called = True Counter.__setitem__(self, key, value) class CounterSubclassWithGet(Counter): # Test a counter subclass that overrides get() def __init__(self, *args, **kwds): self.called = False Counter.__init__(self, *args, **kwds) def get(self, key, default): self.called = True return Counter.get(self, key, default) class TestCounter(unittest.TestCase): def test_basics(self): c = Counter('abcaba') self.assertEqual(c, Counter({'a':3 , 'b': 2, 'c': 1})) self.assertEqual(c, Counter(a=3, b=2, c=1)) self.assertIsInstance(c, dict) self.assertIsInstance(c, Mapping) self.assertTrue(issubclass(Counter, dict)) self.assertTrue(issubclass(Counter, Mapping)) self.assertEqual(len(c), 3) self.assertEqual(sum(c.values()), 6) self.assertEqual(sorted(c.values()), [1, 2, 3]) self.assertEqual(sorted(c.keys()), ['a', 'b', 'c']) self.assertEqual(sorted(c), ['a', 'b', 'c']) self.assertEqual(sorted(c.items()), [('a', 3), ('b', 2), ('c', 1)]) self.assertEqual(c['b'], 2) self.assertEqual(c['z'], 0) self.assertEqual(c.__contains__('c'), True) self.assertEqual(c.__contains__('z'), False) self.assertEqual(c.get('b', 10), 2) self.assertEqual(c.get('z', 10), 10) self.assertEqual(c, dict(a=3, b=2, c=1)) self.assertEqual(repr(c), "Counter({'a': 3, 'b': 2, 'c': 1})") self.assertEqual(c.most_common(), [('a', 3), ('b', 2), ('c', 1)]) for i in range(5): self.assertEqual(c.most_common(i), [('a', 3), ('b', 2), ('c', 1)][:i]) self.assertEqual(''.join(sorted(c.elements())), 'aaabbc') c['a'] += 1 # increment an existing value c['b'] -= 2 # sub existing value to zero del c['c'] # remove an entry del c['c'] # make sure that del doesn't raise KeyError c['d'] -= 2 # sub from a missing value c['e'] = -5 # directly assign a missing value c['f'] += 4 # add to a missing value self.assertEqual(c, dict(a=4, b=0, d=-2, e=-5, f=4)) self.assertEqual(''.join(sorted(c.elements())), 'aaaaffff') self.assertEqual(c.pop('f'), 4) self.assertNotIn('f', c) for i in range(3): elem, cnt = c.popitem() self.assertNotIn(elem, c) c.clear() self.assertEqual(c, {}) self.assertEqual(repr(c), 'Counter()') self.assertRaises(NotImplementedError, Counter.fromkeys, 'abc') self.assertRaises(TypeError, hash, c) c.update(dict(a=5, b=3)) c.update(c=1) c.update(Counter('a' * 50 + 'b' * 30)) c.update() # test case with no args c.__init__('a' * 500 + 'b' * 300) c.__init__('cdc') c.__init__() self.assertEqual(c, dict(a=555, b=333, c=3, d=1)) self.assertEqual(c.setdefault('d', 5), 1) self.assertEqual(c['d'], 1) self.assertEqual(c.setdefault('e', 5), 5) self.assertEqual(c['e'], 5) def test_init(self): self.assertEqual(list(Counter(self=42).items()), [('self', 42)]) self.assertEqual(list(Counter(iterable=42).items()), [('iterable', 42)]) self.assertEqual(list(Counter(iterable=None).items()), [('iterable', None)]) self.assertRaises(TypeError, Counter, 42) self.assertRaises(TypeError, Counter, (), ()) self.assertRaises(TypeError, Counter.__init__) def test_update(self): c = Counter() c.update(self=42) self.assertEqual(list(c.items()), [('self', 42)]) c = Counter() c.update(iterable=42) self.assertEqual(list(c.items()), [('iterable', 42)]) c = Counter() c.update(iterable=None) self.assertEqual(list(c.items()), [('iterable', None)]) self.assertRaises(TypeError, Counter().update, 42) self.assertRaises(TypeError, Counter().update, {}, {}) self.assertRaises(TypeError, Counter.update) def test_copying(self): # Check that counters are copyable, deepcopyable, picklable, and #have a repr/eval round-trip words = Counter('which witch had which witches wrist watch'.split()) def check(dup): msg = "\ncopy: %s\nwords: %s" % (dup, words) self.assertIsNot(dup, words, msg) self.assertEqual(dup, words) check(words.copy()) check(copy.copy(words)) check(copy.deepcopy(words)) for proto in range(pickle.HIGHEST_PROTOCOL + 1): with self.subTest(proto=proto): check(pickle.loads(pickle.dumps(words, proto))) check(eval(repr(words))) update_test = Counter() update_test.update(words) check(update_test) check(Counter(words)) def test_copy_subclass(self): class MyCounter(Counter): pass c = MyCounter('slartibartfast') d = c.copy() self.assertEqual(d, c) self.assertEqual(len(d), len(c)) self.assertEqual(type(d), type(c)) def test_conversions(self): # Convert to: set, list, dict s = 'she sells sea shells by the sea shore' self.assertEqual(sorted(Counter(s).elements()), sorted(s)) self.assertEqual(sorted(Counter(s)), sorted(set(s))) self.assertEqual(dict(Counter(s)), dict(Counter(s).items())) self.assertEqual(set(Counter(s)), set(s)) def test_invariant_for_the_in_operator(self): c = Counter(a=10, b=-2, c=0) for elem in c: self.assertTrue(elem in c) self.assertIn(elem, c) def test_multiset_operations(self): # Verify that adding a zero counter will strip zeros and negatives c = Counter(a=10, b=-2, c=0) + Counter() self.assertEqual(dict(c), dict(a=10)) elements = 'abcd' for i in range(1000): # test random pairs of multisets p = Counter(dict((elem, randrange(-2,4)) for elem in elements)) p.update(e=1, f=-1, g=0) q = Counter(dict((elem, randrange(-2,4)) for elem in elements)) q.update(h=1, i=-1, j=0) for counterop, numberop in [ (Counter.__add__, lambda x, y: max(0, x+y)), (Counter.__sub__, lambda x, y: max(0, x-y)), (Counter.__or__, lambda x, y: max(0,x,y)), (Counter.__and__, lambda x, y: max(0, min(x,y))), ]: result = counterop(p, q) for x in elements: self.assertEqual(numberop(p[x], q[x]), result[x], (counterop, x, p, q)) # verify that results exclude non-positive counts self.assertTrue(x>0 for x in result.values()) elements = 'abcdef' for i in range(100): # verify that random multisets with no repeats are exactly like sets p = Counter(dict((elem, randrange(0, 2)) for elem in elements)) q = Counter(dict((elem, randrange(0, 2)) for elem in elements)) for counterop, setop in [ (Counter.__sub__, set.__sub__), (Counter.__or__, set.__or__), (Counter.__and__, set.__and__), ]: counter_result = counterop(p, q) set_result = setop(set(p.elements()), set(q.elements())) self.assertEqual(counter_result, dict.fromkeys(set_result, 1)) def test_inplace_operations(self): elements = 'abcd' for i in range(1000): # test random pairs of multisets p = Counter(dict((elem, randrange(-2,4)) for elem in elements)) p.update(e=1, f=-1, g=0) q = Counter(dict((elem, randrange(-2,4)) for elem in elements)) q.update(h=1, i=-1, j=0) for inplace_op, regular_op in [ (Counter.__iadd__, Counter.__add__), (Counter.__isub__, Counter.__sub__), (Counter.__ior__, Counter.__or__), (Counter.__iand__, Counter.__and__), ]: c = p.copy() c_id = id(c) regular_result = regular_op(c, q) inplace_result = inplace_op(c, q) self.assertEqual(inplace_result, regular_result) self.assertEqual(id(inplace_result), c_id) def test_subtract(self): c = Counter(a=-5, b=0, c=5, d=10, e=15,g=40) c.subtract(a=1, b=2, c=-3, d=10, e=20, f=30, h=-50) self.assertEqual(c, Counter(a=-6, b=-2, c=8, d=0, e=-5, f=-30, g=40, h=50)) c = Counter(a=-5, b=0, c=5, d=10, e=15,g=40) c.subtract(Counter(a=1, b=2, c=-3, d=10, e=20, f=30, h=-50)) self.assertEqual(c, Counter(a=-6, b=-2, c=8, d=0, e=-5, f=-30, g=40, h=50)) c = Counter('aaabbcd') c.subtract('aaaabbcce') self.assertEqual(c, Counter(a=-1, b=0, c=-1, d=1, e=-1)) c = Counter() c.subtract(self=42) self.assertEqual(list(c.items()), [('self', -42)]) c = Counter() c.subtract(iterable=42) self.assertEqual(list(c.items()), [('iterable', -42)]) self.assertRaises(TypeError, Counter().subtract, 42) self.assertRaises(TypeError, Counter().subtract, {}, {}) self.assertRaises(TypeError, Counter.subtract) def test_unary(self): c = Counter(a=-5, b=0, c=5, d=10, e=15,g=40) self.assertEqual(dict(+c), dict(c=5, d=10, e=15, g=40)) self.assertEqual(dict(-c), dict(a=5)) def test_repr_nonsortable(self): c = Counter(a=2, b=None) r = repr(c) self.assertIn("'a': 2", r) self.assertIn("'b': None", r) def test_helper_function(self): # two paths, one for real dicts and one for other mappings elems = list('abracadabra') d = dict() _count_elements(d, elems) self.assertEqual(d, {'a': 5, 'r': 2, 'b': 2, 'c': 1, 'd': 1}) m = OrderedDict() _count_elements(m, elems) self.assertEqual(m, OrderedDict([('a', 5), ('b', 2), ('r', 2), ('c', 1), ('d', 1)])) # test fidelity to the pure python version c = CounterSubclassWithSetItem('abracadabra') self.assertTrue(c.called) self.assertEqual(dict(c), {'a': 5, 'b': 2, 'c': 1, 'd': 1, 'r':2 }) c = CounterSubclassWithGet('abracadabra') self.assertTrue(c.called) self.assertEqual(dict(c), {'a': 5, 'b': 2, 'c': 1, 'd': 1, 'r':2 }) ################################################################################ ### Run tests ################################################################################ def test_main(verbose=None): NamedTupleDocs = doctest.DocTestSuite(module=collections) test_classes = [TestNamedTuple, NamedTupleDocs, TestOneTrickPonyABCs, TestCollectionABCs, TestCounter, TestChainMap, TestUserObjects, ] support.run_unittest(*test_classes) support.run_doctest(collections, verbose) if __name__ == "__main__": test_main(verbose=True)