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Copy pathtest_set.py
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2230 lines (1848 loc) · 74.5 KB
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import collections.abc
import copy
import gc
import itertools
import operator
import pickle
import re
import unittest
import warnings
import weakref
from random import randrange, shuffle
from test import support
from test.support import warnings_helper
class PassThru(Exception):
pass
def check_pass_thru():
raise PassThru
yield 1
class CustomHash:
def __init__(self, hash):
self.hash = hash
def __hash__(self):
return self.hash
def __repr__(self):
return f'<CustomHash {self.hash} at {id(self):#x}>'
class BadCmp:
def __hash__(self):
return 1
def __eq__(self, other):
raise RuntimeError
class ReprWrapper:
'Used to test self-referential repr() calls'
def __repr__(self):
return repr(self.value)
class HashCountingInt(int):
'int-like object that counts the number of times __hash__ is called'
def __init__(self, *args):
self.hash_count = 0
def __hash__(self):
self.hash_count += 1
return int.__hash__(self)
class TestJointOps:
# Tests common to both set and frozenset
def setUp(self):
self.word = word = 'simsalabim'
self.otherword = 'madagascar'
self.letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
self.s = self.thetype(word)
self.d = dict.fromkeys(word)
def test_new_or_init(self):
self.assertRaises(TypeError, self.thetype, [], 2)
self.assertRaises(TypeError, set().__init__, a=1)
def test_uniquification(self):
actual = sorted(self.s)
expected = sorted(self.d)
self.assertEqual(actual, expected)
self.assertRaises(PassThru, self.thetype, check_pass_thru())
self.assertRaises(TypeError, self.thetype, [[]])
def test_len(self):
self.assertEqual(len(self.s), len(self.d))
def test_contains(self):
for c in self.letters:
self.assertEqual(c in self.s, c in self.d)
self.assertRaises(TypeError, self.s.__contains__, [[]])
s = self.thetype([frozenset(self.letters)])
self.assertIn(self.thetype(self.letters), s)
def test_union(self):
u = self.s.union(self.otherword)
for c in self.letters:
self.assertEqual(c in u, c in self.d or c in self.otherword)
self.assertEqual(self.s, self.thetype(self.word))
self.assertEqual(type(u), self.basetype)
self.assertRaises(PassThru, self.s.union, check_pass_thru())
self.assertRaises(TypeError, self.s.union, [[]])
for C in set, frozenset, dict.fromkeys, str, list, tuple:
self.assertEqual(self.thetype('abcba').union(C('cdc')), set('abcd'))
self.assertEqual(self.thetype('abcba').union(C('efgfe')), set('abcefg'))
self.assertEqual(self.thetype('abcba').union(C('ccb')), set('abc'))
self.assertEqual(self.thetype('abcba').union(C('ef')), set('abcef'))
self.assertEqual(self.thetype('abcba').union(C('ef'), C('fg')), set('abcefg'))
# Issue #6573
x = self.thetype()
self.assertEqual(x.union(set([1]), x, set([2])), self.thetype([1, 2]))
def test_or(self):
i = self.s.union(self.otherword)
self.assertEqual(self.s | set(self.otherword), i)
self.assertEqual(self.s | frozenset(self.otherword), i)
try:
self.s | self.otherword
except TypeError:
pass
else:
self.fail("s|t did not screen-out general iterables")
def test_intersection(self):
i = self.s.intersection(self.otherword)
for c in self.letters:
self.assertEqual(c in i, c in self.d and c in self.otherword)
self.assertEqual(self.s, self.thetype(self.word))
self.assertEqual(type(i), self.basetype)
self.assertRaises(PassThru, self.s.intersection, check_pass_thru())
for C in set, frozenset, dict.fromkeys, str, list, tuple:
self.assertEqual(self.thetype('abcba').intersection(C('cdc')), set('cc'))
self.assertEqual(self.thetype('abcba').intersection(C('efgfe')), set(''))
self.assertEqual(self.thetype('abcba').intersection(C('ccb')), set('bc'))
self.assertEqual(self.thetype('abcba').intersection(C('ef')), set(''))
self.assertEqual(self.thetype('abcba').intersection(C('cbcf'), C('bag')), set('b'))
s = self.thetype('abcba')
z = s.intersection()
if self.thetype == frozenset():
self.assertEqual(id(s), id(z))
else:
self.assertNotEqual(id(s), id(z))
def test_isdisjoint(self):
def f(s1, s2):
'Pure python equivalent of isdisjoint()'
return not set(s1).intersection(s2)
for larg in '', 'a', 'ab', 'abc', 'ababac', 'cdc', 'cc', 'efgfe', 'ccb', 'ef':
s1 = self.thetype(larg)
for rarg in '', 'a', 'ab', 'abc', 'ababac', 'cdc', 'cc', 'efgfe', 'ccb', 'ef':
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s2 = C(rarg)
actual = s1.isdisjoint(s2)
expected = f(s1, s2)
self.assertEqual(actual, expected)
self.assertTrue(actual is True or actual is False)
def test_and(self):
i = self.s.intersection(self.otherword)
self.assertEqual(self.s & set(self.otherword), i)
self.assertEqual(self.s & frozenset(self.otherword), i)
try:
self.s & self.otherword
except TypeError:
pass
else:
self.fail("s&t did not screen-out general iterables")
def test_difference(self):
i = self.s.difference(self.otherword)
for c in self.letters:
self.assertEqual(c in i, c in self.d and c not in self.otherword)
self.assertEqual(self.s, self.thetype(self.word))
self.assertEqual(type(i), self.basetype)
self.assertRaises(PassThru, self.s.difference, check_pass_thru())
self.assertRaises(TypeError, self.s.difference, [[]])
for C in set, frozenset, dict.fromkeys, str, list, tuple:
self.assertEqual(self.thetype('abcba').difference(C('cdc')), set('ab'))
self.assertEqual(self.thetype('abcba').difference(C('efgfe')), set('abc'))
self.assertEqual(self.thetype('abcba').difference(C('ccb')), set('a'))
self.assertEqual(self.thetype('abcba').difference(C('ef')), set('abc'))
self.assertEqual(self.thetype('abcba').difference(), set('abc'))
self.assertEqual(self.thetype('abcba').difference(C('a'), C('b')), set('c'))
def test_sub(self):
i = self.s.difference(self.otherword)
self.assertEqual(self.s - set(self.otherword), i)
self.assertEqual(self.s - frozenset(self.otherword), i)
try:
self.s - self.otherword
except TypeError:
pass
else:
self.fail("s-t did not screen-out general iterables")
def test_symmetric_difference(self):
i = self.s.symmetric_difference(self.otherword)
for c in self.letters:
self.assertEqual(c in i, (c in self.d) ^ (c in self.otherword))
self.assertEqual(self.s, self.thetype(self.word))
self.assertEqual(type(i), self.basetype)
self.assertRaises(PassThru, self.s.symmetric_difference, check_pass_thru())
self.assertRaises(TypeError, self.s.symmetric_difference, [[]])
constructors = (set, frozenset,
dict.fromkeys, frozendict.fromkeys,
str, list, tuple)
for C in constructors:
self.assertEqual(self.thetype('abcba').symmetric_difference(C('cdc')), set('abd'))
self.assertEqual(self.thetype('abcba').symmetric_difference(C('efgfe')), set('abcefg'))
self.assertEqual(self.thetype('abcba').symmetric_difference(C('ccb')), set('a'))
self.assertEqual(self.thetype('abcba').symmetric_difference(C('ef')), set('abcef'))
def test_xor(self):
i = self.s.symmetric_difference(self.otherword)
self.assertEqual(self.s ^ set(self.otherword), i)
self.assertEqual(self.s ^ frozenset(self.otherword), i)
try:
self.s ^ self.otherword
except TypeError:
pass
else:
self.fail("s^t did not screen-out general iterables")
def test_equality(self):
self.assertEqual(self.s, set(self.word))
self.assertEqual(self.s, frozenset(self.word))
self.assertEqual(self.s == self.word, False)
self.assertNotEqual(self.s, set(self.otherword))
self.assertNotEqual(self.s, frozenset(self.otherword))
self.assertEqual(self.s != self.word, True)
def test_setOfFrozensets(self):
t = map(frozenset, ['abcdef', 'bcd', 'bdcb', 'fed', 'fedccba'])
s = self.thetype(t)
self.assertEqual(len(s), 3)
def test_sub_and_super(self):
p, q, r = map(self.thetype, ['ab', 'abcde', 'def'])
self.assertTrue(p < q)
self.assertTrue(p <= q)
self.assertTrue(q <= q)
self.assertTrue(q > p)
self.assertTrue(q >= p)
self.assertFalse(q < r)
self.assertFalse(q <= r)
self.assertFalse(q > r)
self.assertFalse(q >= r)
self.assertTrue(set('a').issubset('abc'))
self.assertTrue(set('abc').issuperset('a'))
self.assertFalse(set('a').issubset('cbs'))
self.assertFalse(set('cbs').issuperset('a'))
def test_pickling(self):
for i in range(pickle.HIGHEST_PROTOCOL + 1):
if type(self.s) not in (set, frozenset):
self.s.x = ['x']
self.s.z = ['z']
p = pickle.dumps(self.s, i)
dup = pickle.loads(p)
self.assertEqual(self.s, dup, "%s != %s" % (self.s, dup))
if type(self.s) not in (set, frozenset):
self.assertEqual(self.s.x, dup.x)
self.assertEqual(self.s.z, dup.z)
self.assertNotHasAttr(self.s, 'y')
del self.s.x, self.s.z
def test_iterator_pickling(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
itorg = iter(self.s)
data = self.thetype(self.s)
d = pickle.dumps(itorg, proto)
it = pickle.loads(d)
# Set iterators unpickle as list iterators due to the
# undefined order of set items.
# self.assertEqual(type(itorg), type(it))
self.assertIsInstance(it, collections.abc.Iterator)
self.assertEqual(self.thetype(it), data)
it = pickle.loads(d)
try:
drop = next(it)
except StopIteration:
continue
d = pickle.dumps(it, proto)
it = pickle.loads(d)
self.assertEqual(self.thetype(it), data - self.thetype((drop,)))
def test_deepcopy(self):
class Tracer:
def __init__(self, value):
self.value = value
def __hash__(self):
return self.value
def __deepcopy__(self, memo=None):
return Tracer(self.value + 1)
t = Tracer(10)
s = self.thetype([t])
dup = copy.deepcopy(s)
self.assertNotEqual(id(s), id(dup))
for elem in dup:
newt = elem
self.assertNotEqual(id(t), id(newt))
self.assertEqual(t.value + 1, newt.value)
def test_gc(self):
# Create a nest of cycles to exercise overall ref count check
class A:
pass
s = set(A() for i in range(1000))
for elem in s:
elem.cycle = s
elem.sub = elem
elem.set = set([elem])
def test_subclass_with_custom_hash(self):
# Bug #1257731
class H(self.thetype):
def __hash__(self):
return int(id(self) & 0x7fffffff)
s=H()
f=set()
f.add(s)
self.assertIn(s, f)
f.remove(s)
f.add(s)
f.discard(s)
def test_badcmp(self):
s = self.thetype([BadCmp()])
# Detect comparison errors during insertion and lookup
self.assertRaises(RuntimeError, self.thetype, [BadCmp(), BadCmp()])
self.assertRaises(RuntimeError, s.__contains__, BadCmp())
# Detect errors during mutating operations
if hasattr(s, 'add'):
self.assertRaises(RuntimeError, s.add, BadCmp())
self.assertRaises(RuntimeError, s.discard, BadCmp())
self.assertRaises(RuntimeError, s.remove, BadCmp())
def test_cyclical_repr(self):
w = ReprWrapper()
s = self.thetype([w])
w.value = s
if self.thetype == set:
self.assertEqual(repr(s), '{set(...)}')
else:
name = repr(s).partition('(')[0] # strip class name
self.assertEqual(repr(s), '%s({%s(...)})' % (name, name))
def test_do_not_rehash_dict_keys(self):
n = 10
d = dict.fromkeys(map(HashCountingInt, range(n)))
self.assertEqual(sum(elem.hash_count for elem in d), n)
s = self.thetype(d)
self.assertEqual(sum(elem.hash_count for elem in d), n)
s.difference(d)
self.assertEqual(sum(elem.hash_count for elem in d), n)
if hasattr(s, 'symmetric_difference_update'):
s.symmetric_difference_update(d)
self.assertEqual(sum(elem.hash_count for elem in d), n)
d2 = dict.fromkeys(set(d))
self.assertEqual(sum(elem.hash_count for elem in d), n)
d3 = dict.fromkeys(frozenset(d))
self.assertEqual(sum(elem.hash_count for elem in d), n)
d3 = dict.fromkeys(frozenset(d), 123)
self.assertEqual(sum(elem.hash_count for elem in d), n)
self.assertEqual(d3, dict.fromkeys(d, 123))
def test_container_iterator(self):
# Bug #3680: tp_traverse was not implemented for set iterator object
class C(object):
pass
obj = C()
ref = weakref.ref(obj)
container = set([obj, 1])
obj.x = iter(container)
del obj, container
gc.collect()
self.assertTrue(ref() is None, "Cycle was not collected")
def test_free_after_iterating(self):
support.check_free_after_iterating(self, iter, self.thetype)
class TestSet(TestJointOps, unittest.TestCase):
thetype = set
basetype = set
def test_init(self):
s = self.thetype()
s.__init__(self.word)
self.assertEqual(s, set(self.word))
s.__init__(self.otherword)
self.assertEqual(s, set(self.otherword))
self.assertRaises(TypeError, s.__init__, s, 2)
self.assertRaises(TypeError, s.__init__, 1)
def test_constructor_identity(self):
s = self.thetype(range(3))
t = self.thetype(s)
self.assertNotEqual(id(s), id(t))
def test_set_literal(self):
s = set([1,2,3])
t = {1,2,3}
self.assertEqual(s, t)
def test_set_literal_insertion_order(self):
# SF Issue #26020 -- Expect left to right insertion
s = {1, 1.0, True}
self.assertEqual(len(s), 1)
stored_value = s.pop()
self.assertEqual(type(stored_value), int)
def test_set_literal_evaluation_order(self):
# Expect left to right expression evaluation
events = []
def record(obj):
events.append(obj)
s = {record(1), record(2), record(3)}
self.assertEqual(events, [1, 2, 3])
def test_hash(self):
self.assertRaises(TypeError, hash, self.s)
def test_clear(self):
self.s.clear()
self.assertEqual(self.s, set())
self.assertEqual(len(self.s), 0)
def test_copy(self):
dup = self.s.copy()
self.assertEqual(self.s, dup)
self.assertNotEqual(id(self.s), id(dup))
self.assertEqual(type(dup), self.basetype)
def test_add(self):
self.s.add('Q')
self.assertIn('Q', self.s)
dup = self.s.copy()
self.s.add('Q')
self.assertEqual(self.s, dup)
self.assertRaises(TypeError, self.s.add, [])
def test_remove(self):
self.s.remove('a')
self.assertNotIn('a', self.s)
self.assertRaises(KeyError, self.s.remove, 'Q')
self.assertRaises(TypeError, self.s.remove, [])
s = self.thetype([frozenset(self.word)])
self.assertIn(self.thetype(self.word), s)
s.remove(self.thetype(self.word))
self.assertNotIn(self.thetype(self.word), s)
self.assertRaises(KeyError, self.s.remove, self.thetype(self.word))
def test_remove_keyerror_unpacking(self):
# https://bugs.python.org/issue1576657
for v1 in ['Q', (1,)]:
try:
self.s.remove(v1)
except KeyError as e:
v2 = e.args[0]
self.assertEqual(v1, v2)
else:
self.fail()
def test_remove_keyerror_set(self):
key = self.thetype([3, 4])
try:
self.s.remove(key)
except KeyError as e:
self.assertTrue(e.args[0] is key,
"KeyError should be {0}, not {1}".format(key,
e.args[0]))
else:
self.fail()
def test_discard(self):
self.s.discard('a')
self.assertNotIn('a', self.s)
self.s.discard('Q')
self.assertRaises(TypeError, self.s.discard, [])
s = self.thetype([frozenset(self.word)])
self.assertIn(self.thetype(self.word), s)
s.discard(self.thetype(self.word))
self.assertNotIn(self.thetype(self.word), s)
s.discard(self.thetype(self.word))
def test_pop(self):
for i in range(len(self.s)):
elem = self.s.pop()
self.assertNotIn(elem, self.s)
self.assertRaises(KeyError, self.s.pop)
def test_update(self):
retval = self.s.update(self.otherword)
self.assertEqual(retval, None)
for c in (self.word + self.otherword):
self.assertIn(c, self.s)
self.assertRaises(PassThru, self.s.update, check_pass_thru())
self.assertRaises(TypeError, self.s.update, [[]])
for p, q in (('cdc', 'abcd'), ('efgfe', 'abcefg'), ('ccb', 'abc'), ('ef', 'abcef')):
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s = self.thetype('abcba')
self.assertEqual(s.update(C(p)), None)
self.assertEqual(s, set(q))
for p in ('cdc', 'efgfe', 'ccb', 'ef', 'abcda'):
q = 'ahi'
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s = self.thetype('abcba')
self.assertEqual(s.update(C(p), C(q)), None)
self.assertEqual(s, set(s) | set(p) | set(q))
def test_ior(self):
self.s |= set(self.otherword)
for c in (self.word + self.otherword):
self.assertIn(c, self.s)
def test_intersection_update(self):
retval = self.s.intersection_update(self.otherword)
self.assertEqual(retval, None)
for c in (self.word + self.otherword):
if c in self.otherword and c in self.word:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
self.assertRaises(PassThru, self.s.intersection_update, check_pass_thru())
self.assertRaises(TypeError, self.s.intersection_update, [[]])
for p, q in (('cdc', 'c'), ('efgfe', ''), ('ccb', 'bc'), ('ef', '')):
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s = self.thetype('abcba')
self.assertEqual(s.intersection_update(C(p)), None)
self.assertEqual(s, set(q))
ss = 'abcba'
s = self.thetype(ss)
t = 'cbc'
self.assertEqual(s.intersection_update(C(p), C(t)), None)
self.assertEqual(s, set('abcba')&set(p)&set(t))
def test_iand(self):
self.s &= set(self.otherword)
for c in (self.word + self.otherword):
if c in self.otherword and c in self.word:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_difference_update(self):
retval = self.s.difference_update(self.otherword)
self.assertEqual(retval, None)
for c in (self.word + self.otherword):
if c in self.word and c not in self.otherword:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
self.assertRaises(PassThru, self.s.difference_update, check_pass_thru())
self.assertRaises(TypeError, self.s.difference_update, [[]])
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
for p, q in (('cdc', 'ab'), ('efgfe', 'abc'), ('ccb', 'a'), ('ef', 'abc')):
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s = self.thetype('abcba')
self.assertEqual(s.difference_update(C(p)), None)
self.assertEqual(s, set(q))
s = self.thetype('abcdefghih')
s.difference_update()
self.assertEqual(s, self.thetype('abcdefghih'))
s = self.thetype('abcdefghih')
s.difference_update(C('aba'))
self.assertEqual(s, self.thetype('cdefghih'))
s = self.thetype('abcdefghih')
s.difference_update(C('cdc'), C('aba'))
self.assertEqual(s, self.thetype('efghih'))
def test_isub(self):
self.s -= set(self.otherword)
for c in (self.word + self.otherword):
if c in self.word and c not in self.otherword:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_symmetric_difference_update(self):
retval = self.s.symmetric_difference_update(self.otherword)
self.assertEqual(retval, None)
for c in (self.word + self.otherword):
if (c in self.word) ^ (c in self.otherword):
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
self.assertRaises(PassThru, self.s.symmetric_difference_update, check_pass_thru())
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
for p, q in (('cdc', 'abd'), ('efgfe', 'abcefg'), ('ccb', 'a'), ('ef', 'abcef')):
for C in set, frozenset, dict.fromkeys, str, list, tuple:
s = self.thetype('abcba')
self.assertEqual(s.symmetric_difference_update(C(p)), None)
self.assertEqual(s, set(q))
def test_ixor(self):
self.s ^= set(self.otherword)
for c in (self.word + self.otherword):
if (c in self.word) ^ (c in self.otherword):
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_inplace_on_self(self):
t = self.s.copy()
t |= t
self.assertEqual(t, self.s)
t &= t
self.assertEqual(t, self.s)
t -= t
self.assertEqual(t, self.thetype())
t = self.s.copy()
t ^= t
self.assertEqual(t, self.thetype())
def test_weakref(self):
s = self.thetype('gallahad')
p = weakref.proxy(s)
self.assertEqual(str(p), str(s))
s = None
support.gc_collect() # For PyPy or other GCs.
self.assertRaises(ReferenceError, str, p)
def test_rich_compare(self):
class TestRichSetCompare:
def __gt__(self, some_set):
self.gt_called = True
return False
def __lt__(self, some_set):
self.lt_called = True
return False
def __ge__(self, some_set):
self.ge_called = True
return False
def __le__(self, some_set):
self.le_called = True
return False
# This first tries the builtin rich set comparison, which doesn't know
# how to handle the custom object. Upon returning NotImplemented, the
# corresponding comparison on the right object is invoked.
myset = {1, 2, 3}
myobj = TestRichSetCompare()
myset < myobj
self.assertTrue(myobj.gt_called)
myobj = TestRichSetCompare()
myset > myobj
self.assertTrue(myobj.lt_called)
myobj = TestRichSetCompare()
myset <= myobj
self.assertTrue(myobj.ge_called)
myobj = TestRichSetCompare()
myset >= myobj
self.assertTrue(myobj.le_called)
def test_set_membership(self):
myfrozenset = frozenset(range(3))
myset = {myfrozenset, "abc", 1}
self.assertIn(set(range(3)), myset)
self.assertNotIn(set(range(1)), myset)
myset.discard(set(range(3)))
self.assertEqual(myset, {"abc", 1})
self.assertRaises(KeyError, myset.remove, set(range(1)))
self.assertRaises(KeyError, myset.remove, set(range(3)))
def test_unhashable_element(self):
myset = {'a'}
elem = [1, 2, 3]
def check_unhashable_element():
msg = "cannot use 'list' as a set element (unhashable type: 'list')"
return self.assertRaisesRegex(TypeError, re.escape(msg))
with check_unhashable_element():
elem in myset
with check_unhashable_element():
myset.add(elem)
with check_unhashable_element():
myset.discard(elem)
# Only TypeError exception is overridden,
# other exceptions are left unchanged.
class HashError:
def __hash__(self):
raise KeyError('error')
elem2 = HashError()
with self.assertRaises(KeyError):
elem2 in myset
with self.assertRaises(KeyError):
myset.add(elem2)
with self.assertRaises(KeyError):
myset.discard(elem2)
def test_hash_collision_remove_add(self):
self.maxDiff = None
# There should be enough space, so all elements with unique hash
# will be placed in corresponding cells without collision.
n = 64
elems = [CustomHash(h) for h in range(n)]
# Elements with hash collision.
a = CustomHash(n)
b = CustomHash(n)
elems += [a, b]
s = self.thetype(elems)
self.assertEqual(len(s), len(elems), s)
s.remove(a)
# "a" has been replaced with a dummy.
del elems[n]
self.assertEqual(len(s), len(elems), s)
self.assertEqual(s, set(elems))
s.add(b)
# "b" should not replace the dummy.
self.assertEqual(len(s), len(elems), s)
self.assertEqual(s, set(elems))
class SetSubclass(set):
pass
class TestSetSubclass(TestSet):
thetype = SetSubclass
basetype = set
def test_keywords_in_subclass(self):
class subclass(set):
pass
u = subclass([1, 2])
self.assertIs(type(u), subclass)
self.assertEqual(set(u), {1, 2})
with self.assertRaises(TypeError):
subclass(sequence=())
class subclass_with_init(set):
def __init__(self, arg, newarg=None):
super().__init__(arg)
self.newarg = newarg
u = subclass_with_init([1, 2], newarg=3)
self.assertIs(type(u), subclass_with_init)
self.assertEqual(set(u), {1, 2})
self.assertEqual(u.newarg, 3)
class subclass_with_new(set):
def __new__(cls, arg, newarg=None):
self = super().__new__(cls, arg)
self.newarg = newarg
return self
u = subclass_with_new([1, 2])
self.assertIs(type(u), subclass_with_new)
self.assertEqual(set(u), {1, 2})
self.assertIsNone(u.newarg)
# disallow kwargs in __new__ only (https://bugs.python.org/issue43413#msg402000)
with self.assertRaises(TypeError):
subclass_with_new([1, 2], newarg=3)
class TestFrozenSet(TestJointOps, unittest.TestCase):
thetype = frozenset
basetype = frozenset
def test_init(self):
s = self.thetype(self.word)
s.__init__(self.otherword)
self.assertEqual(s, set(self.word))
def test_constructor_identity(self):
s = self.thetype(range(3))
t = self.thetype(s)
self.assertEqual(id(s), id(t))
def test_hash(self):
self.assertEqual(hash(self.thetype('abcdeb')),
hash(self.thetype('ebecda')))
# make sure that all permutations give the same hash value
n = 100
seq = [randrange(n) for i in range(n)]
results = set()
for i in range(200):
shuffle(seq)
results.add(hash(self.thetype(seq)))
self.assertEqual(len(results), 1)
def test_copy(self):
dup = self.s.copy()
self.assertEqual(id(self.s), id(dup))
def test_frozen_as_dictkey(self):
seq = list(range(10)) + list('abcdefg') + ['apple']
key1 = self.thetype(seq)
key2 = self.thetype(reversed(seq))
self.assertEqual(key1, key2)
self.assertNotEqual(id(key1), id(key2))
d = {}
d[key1] = 42
self.assertEqual(d[key2], 42)
def test_hash_caching(self):
f = self.thetype('abcdcda')
self.assertEqual(hash(f), hash(f))
def test_hash_effectiveness(self):
n = 13
hashvalues = set()
addhashvalue = hashvalues.add
elemmasks = [(i+1, 1<<i) for i in range(n)]
for i in range(2**n):
addhashvalue(hash(frozenset([e for e, m in elemmasks if m&i])))
self.assertEqual(len(hashvalues), 2**n)
def zf_range(n):
# https://en.wikipedia.org/wiki/Set-theoretic_definition_of_natural_numbers
nums = [frozenset()]
for i in range(n-1):
num = frozenset(nums)
nums.append(num)
return nums[:n]
def powerset(s):
for i in range(len(s)+1):
yield from map(frozenset, itertools.combinations(s, i))
for n in range(18):
t = 2 ** n
mask = t - 1
for nums in (range, zf_range):
u = len({h & mask for h in map(hash, powerset(nums(n)))})
self.assertGreater(4*u, t)
class FrozenSetSubclass(frozenset):
pass
class TestFrozenSetSubclass(TestFrozenSet):
thetype = FrozenSetSubclass
basetype = frozenset
def test_keywords_in_subclass(self):
class subclass(frozenset):
pass
u = subclass([1, 2])
self.assertIs(type(u), subclass)
self.assertEqual(set(u), {1, 2})
with self.assertRaises(TypeError):
subclass(sequence=())
class subclass_with_init(frozenset):
def __init__(self, arg, newarg=None):
self.newarg = newarg
u = subclass_with_init([1, 2], newarg=3)
self.assertIs(type(u), subclass_with_init)
self.assertEqual(set(u), {1, 2})
self.assertEqual(u.newarg, 3)
class subclass_with_new(frozenset):
def __new__(cls, arg, newarg=None):
self = super().__new__(cls, arg)
self.newarg = newarg
return self
u = subclass_with_new([1, 2], newarg=3)
self.assertIs(type(u), subclass_with_new)
self.assertEqual(set(u), {1, 2})
self.assertEqual(u.newarg, 3)
def test_constructor_identity(self):
s = self.thetype(range(3))
t = self.thetype(s)
self.assertNotEqual(id(s), id(t))
def test_copy(self):
dup = self.s.copy()
self.assertNotEqual(id(self.s), id(dup))
def test_nested_empty_constructor(self):
s = self.thetype()
t = self.thetype(s)
self.assertEqual(s, t)
def test_singleton_empty_frozenset(self):
Frozenset = self.thetype
f = frozenset()
F = Frozenset()
efs = [Frozenset(), Frozenset([]), Frozenset(()), Frozenset(''),
Frozenset(), Frozenset([]), Frozenset(()), Frozenset(''),
Frozenset(range(0)), Frozenset(Frozenset()),
Frozenset(frozenset()), f, F, Frozenset(f), Frozenset(F)]
# All empty frozenset subclass instances should have different ids
self.assertEqual(len(set(map(id, efs))), len(efs))
class SetSubclassWithSlots(set):
__slots__ = ('x', 'y', '__dict__')
class TestSetSubclassWithSlots(unittest.TestCase):
thetype = SetSubclassWithSlots
setUp = TestJointOps.setUp
test_pickling = TestJointOps.test_pickling
class FrozenSetSubclassWithSlots(frozenset):
__slots__ = ('x', 'y', '__dict__')
class TestFrozenSetSubclassWithSlots(TestSetSubclassWithSlots):
thetype = FrozenSetSubclassWithSlots
# Tests taken from test_sets.py =============================================
empty_set = set()
#==============================================================================
class TestBasicOps:
def test_repr(self):
if self.repr is not None:
self.assertEqual(repr(self.set), self.repr)
def check_repr_against_values(self):
text = repr(self.set)
self.assertStartsWith(text, '{')
self.assertEndsWith(text, '}')
result = text[1:-1].split(', ')
result.sort()
sorted_repr_values = [repr(value) for value in self.values]
sorted_repr_values.sort()
self.assertEqual(result, sorted_repr_values)
def test_length(self):
self.assertEqual(len(self.set), self.length)
def test_self_equality(self):
self.assertEqual(self.set, self.set)
def test_equivalent_equality(self):
self.assertEqual(self.set, self.dup)
def test_copy(self):
self.assertEqual(self.set.copy(), self.dup)
def test_self_union(self):
result = self.set | self.set
self.assertEqual(result, self.dup)
def test_empty_union(self):
result = self.set | empty_set
self.assertEqual(result, self.dup)
def test_union_empty(self):
result = empty_set | self.set
self.assertEqual(result, self.dup)
def test_self_intersection(self):
result = self.set & self.set
self.assertEqual(result, self.dup)
def test_empty_intersection(self):
result = self.set & empty_set
self.assertEqual(result, empty_set)
def test_intersection_empty(self):
result = empty_set & self.set
self.assertEqual(result, empty_set)
def test_self_isdisjoint(self):
result = self.set.isdisjoint(self.set)
self.assertEqual(result, not self.set)
def test_empty_isdisjoint(self):
result = self.set.isdisjoint(empty_set)
self.assertEqual(result, True)
def test_isdisjoint_empty(self):
result = empty_set.isdisjoint(self.set)
self.assertEqual(result, True)
def test_self_symmetric_difference(self):
result = self.set ^ self.set
self.assertEqual(result, empty_set)
def test_empty_symmetric_difference(self):
result = self.set ^ empty_set
self.assertEqual(result, self.set)
def test_self_difference(self):
result = self.set - self.set
self.assertEqual(result, empty_set)
def test_empty_difference(self):
result = self.set - empty_set
self.assertEqual(result, self.dup)
def test_empty_difference_rev(self):
result = empty_set - self.set
self.assertEqual(result, empty_set)
def test_iteration(self):
for v in self.set:
self.assertIn(v, self.values)
setiter = iter(self.set)
self.assertEqual(setiter.__length_hint__(), len(self.set))
def test_pickling(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
p = pickle.dumps(self.set, proto)
copy = pickle.loads(p)
self.assertEqual(self.set, copy,
"%s != %s" % (self.set, copy))