| import unittest |
| from test import support |
| from weakref import proxy, ref, WeakSet |
| import operator |
| import copy |
| import string |
| import os |
| from random import randrange, shuffle |
| import sys |
| import warnings |
| import collections |
| from collections import UserString as ustr |
| import gc |
| import contextlib |
| |
| |
| class Foo: |
| pass |
| |
| class RefCycle: |
| def __init__(self): |
| self.cycle = self |
| |
| |
| class TestWeakSet(unittest.TestCase): |
| |
| def setUp(self): |
| # need to keep references to them |
| self.items = [ustr(c) for c in ('a', 'b', 'c')] |
| self.items2 = [ustr(c) for c in ('x', 'y', 'z')] |
| self.letters = [ustr(c) for c in string.ascii_letters] |
| self.s = WeakSet(self.items) |
| self.d = dict.fromkeys(self.items) |
| self.obj = ustr('F') |
| self.fs = WeakSet([self.obj]) |
| |
| def test_methods(self): |
| weaksetmethods = dir(WeakSet) |
| for method in dir(set): |
| if method == 'test_c_api' or method.startswith('_'): |
| continue |
| self.assertIn(method, weaksetmethods, |
| "WeakSet missing method " + method) |
| |
| def test_new_or_init(self): |
| self.assertRaises(TypeError, WeakSet, [], 2) |
| |
| def test_len(self): |
| self.assertEqual(len(self.s), len(self.d)) |
| self.assertEqual(len(self.fs), 1) |
| del self.obj |
| self.assertEqual(len(self.fs), 0) |
| |
| def test_contains(self): |
| for c in self.letters: |
| self.assertEqual(c in self.s, c in self.d) |
| # 1 is not weakref'able, but that TypeError is caught by __contains__ |
| self.assertNotIn(1, self.s) |
| self.assertIn(self.obj, self.fs) |
| del self.obj |
| self.assertNotIn(ustr('F'), self.fs) |
| |
| def test_union(self): |
| u = self.s.union(self.items2) |
| for c in self.letters: |
| self.assertEqual(c in u, c in self.d or c in self.items2) |
| self.assertEqual(self.s, WeakSet(self.items)) |
| self.assertEqual(type(u), WeakSet) |
| self.assertRaises(TypeError, self.s.union, [[]]) |
| for C in set, frozenset, dict.fromkeys, list, tuple: |
| x = WeakSet(self.items + self.items2) |
| c = C(self.items2) |
| self.assertEqual(self.s.union(c), x) |
| |
| def test_or(self): |
| i = self.s.union(self.items2) |
| self.assertEqual(self.s | set(self.items2), i) |
| self.assertEqual(self.s | frozenset(self.items2), i) |
| |
| def test_intersection(self): |
| i = self.s.intersection(self.items2) |
| for c in self.letters: |
| self.assertEqual(c in i, c in self.d and c in self.items2) |
| self.assertEqual(self.s, WeakSet(self.items)) |
| self.assertEqual(type(i), WeakSet) |
| for C in set, frozenset, dict.fromkeys, list, tuple: |
| x = WeakSet([]) |
| self.assertEqual(self.s.intersection(C(self.items2)), x) |
| |
| def test_isdisjoint(self): |
| self.assertTrue(self.s.isdisjoint(WeakSet(self.items2))) |
| self.assertTrue(not self.s.isdisjoint(WeakSet(self.letters))) |
| |
| def test_and(self): |
| i = self.s.intersection(self.items2) |
| self.assertEqual(self.s & set(self.items2), i) |
| self.assertEqual(self.s & frozenset(self.items2), i) |
| |
| def test_difference(self): |
| i = self.s.difference(self.items2) |
| for c in self.letters: |
| self.assertEqual(c in i, c in self.d and c not in self.items2) |
| self.assertEqual(self.s, WeakSet(self.items)) |
| self.assertEqual(type(i), WeakSet) |
| self.assertRaises(TypeError, self.s.difference, [[]]) |
| |
| def test_sub(self): |
| i = self.s.difference(self.items2) |
| self.assertEqual(self.s - set(self.items2), i) |
| self.assertEqual(self.s - frozenset(self.items2), i) |
| |
| def test_symmetric_difference(self): |
| i = self.s.symmetric_difference(self.items2) |
| for c in self.letters: |
| self.assertEqual(c in i, (c in self.d) ^ (c in self.items2)) |
| self.assertEqual(self.s, WeakSet(self.items)) |
| self.assertEqual(type(i), WeakSet) |
| self.assertRaises(TypeError, self.s.symmetric_difference, [[]]) |
| |
| def test_xor(self): |
| i = self.s.symmetric_difference(self.items2) |
| self.assertEqual(self.s ^ set(self.items2), i) |
| self.assertEqual(self.s ^ frozenset(self.items2), i) |
| |
| def test_sub_and_super(self): |
| pl, ql, rl = map(lambda s: [ustr(c) for c in s], ['ab', 'abcde', 'def']) |
| p, q, r = map(WeakSet, (pl, ql, rl)) |
| 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_gc(self): |
| # Create a nest of cycles to exercise overall ref count check |
| s = WeakSet(Foo() for i in range(1000)) |
| for elem in s: |
| elem.cycle = s |
| elem.sub = elem |
| elem.set = WeakSet([elem]) |
| |
| def test_subclass_with_custom_hash(self): |
| # Bug #1257731 |
| class H(WeakSet): |
| 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_init(self): |
| s = WeakSet() |
| s.__init__(self.items) |
| self.assertEqual(s, self.s) |
| s.__init__(self.items2) |
| self.assertEqual(s, WeakSet(self.items2)) |
| self.assertRaises(TypeError, s.__init__, s, 2); |
| self.assertRaises(TypeError, s.__init__, 1); |
| |
| def test_constructor_identity(self): |
| s = WeakSet(self.items) |
| t = WeakSet(s) |
| self.assertNotEqual(id(s), id(t)) |
| |
| def test_hash(self): |
| self.assertRaises(TypeError, hash, self.s) |
| |
| def test_clear(self): |
| self.s.clear() |
| self.assertEqual(self.s, WeakSet([])) |
| 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)) |
| |
| def test_add(self): |
| x = ustr('Q') |
| self.s.add(x) |
| self.assertIn(x, self.s) |
| dup = self.s.copy() |
| self.s.add(x) |
| self.assertEqual(self.s, dup) |
| self.assertRaises(TypeError, self.s.add, []) |
| self.fs.add(Foo()) |
| self.assertTrue(len(self.fs) == 1) |
| self.fs.add(self.obj) |
| self.assertTrue(len(self.fs) == 1) |
| |
| def test_remove(self): |
| x = ustr('a') |
| self.s.remove(x) |
| self.assertNotIn(x, self.s) |
| self.assertRaises(KeyError, self.s.remove, x) |
| self.assertRaises(TypeError, self.s.remove, []) |
| |
| def test_discard(self): |
| a, q = ustr('a'), ustr('Q') |
| self.s.discard(a) |
| self.assertNotIn(a, self.s) |
| self.s.discard(q) |
| self.assertRaises(TypeError, self.s.discard, []) |
| |
| 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.items2) |
| self.assertEqual(retval, None) |
| for c in (self.items + self.items2): |
| self.assertIn(c, self.s) |
| self.assertRaises(TypeError, self.s.update, [[]]) |
| |
| def test_update_set(self): |
| self.s.update(set(self.items2)) |
| for c in (self.items + self.items2): |
| self.assertIn(c, self.s) |
| |
| def test_ior(self): |
| self.s |= set(self.items2) |
| for c in (self.items + self.items2): |
| self.assertIn(c, self.s) |
| |
| def test_intersection_update(self): |
| retval = self.s.intersection_update(self.items2) |
| self.assertEqual(retval, None) |
| for c in (self.items + self.items2): |
| if c in self.items2 and c in self.items: |
| self.assertIn(c, self.s) |
| else: |
| self.assertNotIn(c, self.s) |
| self.assertRaises(TypeError, self.s.intersection_update, [[]]) |
| |
| def test_iand(self): |
| self.s &= set(self.items2) |
| for c in (self.items + self.items2): |
| if c in self.items2 and c in self.items: |
| self.assertIn(c, self.s) |
| else: |
| self.assertNotIn(c, self.s) |
| |
| def test_difference_update(self): |
| retval = self.s.difference_update(self.items2) |
| self.assertEqual(retval, None) |
| for c in (self.items + self.items2): |
| if c in self.items and c not in self.items2: |
| self.assertIn(c, self.s) |
| else: |
| self.assertNotIn(c, self.s) |
| self.assertRaises(TypeError, self.s.difference_update, [[]]) |
| self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]]) |
| |
| def test_isub(self): |
| self.s -= set(self.items2) |
| for c in (self.items + self.items2): |
| if c in self.items and c not in self.items2: |
| self.assertIn(c, self.s) |
| else: |
| self.assertNotIn(c, self.s) |
| |
| def test_symmetric_difference_update(self): |
| retval = self.s.symmetric_difference_update(self.items2) |
| self.assertEqual(retval, None) |
| for c in (self.items + self.items2): |
| if (c in self.items) ^ (c in self.items2): |
| self.assertIn(c, self.s) |
| else: |
| self.assertNotIn(c, self.s) |
| self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]]) |
| |
| def test_ixor(self): |
| self.s ^= set(self.items2) |
| for c in (self.items + self.items2): |
| if (c in self.items) ^ (c in self.items2): |
| 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, WeakSet()) |
| t = self.s.copy() |
| t ^= t |
| self.assertEqual(t, WeakSet()) |
| |
| def test_eq(self): |
| # issue 5964 |
| self.assertTrue(self.s == self.s) |
| self.assertTrue(self.s == WeakSet(self.items)) |
| self.assertFalse(self.s == set(self.items)) |
| self.assertFalse(self.s == list(self.items)) |
| self.assertFalse(self.s == tuple(self.items)) |
| self.assertFalse(self.s == WeakSet([Foo])) |
| self.assertFalse(self.s == 1) |
| |
| def test_weak_destroy_while_iterating(self): |
| # Issue #7105: iterators shouldn't crash when a key is implicitly removed |
| # Create new items to be sure no-one else holds a reference |
| items = [ustr(c) for c in ('a', 'b', 'c')] |
| s = WeakSet(items) |
| it = iter(s) |
| next(it) # Trigger internal iteration |
| # Destroy an item |
| del items[-1] |
| gc.collect() # just in case |
| # We have removed either the first consumed items, or another one |
| self.assertIn(len(list(it)), [len(items), len(items) - 1]) |
| del it |
| # The removal has been committed |
| self.assertEqual(len(s), len(items)) |
| |
| def test_weak_destroy_and_mutate_while_iterating(self): |
| # Issue #7105: iterators shouldn't crash when a key is implicitly removed |
| items = [ustr(c) for c in string.ascii_letters] |
| s = WeakSet(items) |
| @contextlib.contextmanager |
| def testcontext(): |
| try: |
| it = iter(s) |
| next(it) |
| del it |
| # Schedule an item for removal and recreate it |
| u = ustr(str(items.pop())) |
| gc.collect() # just in case |
| yield u |
| finally: |
| it = None # should commit all removals |
| |
| with testcontext() as u: |
| self.assertNotIn(u, s) |
| with testcontext() as u: |
| self.assertRaises(KeyError, s.remove, u) |
| self.assertNotIn(u, s) |
| with testcontext() as u: |
| s.add(u) |
| self.assertIn(u, s) |
| t = s.copy() |
| with testcontext() as u: |
| s.update(t) |
| self.assertEqual(len(s), len(t)) |
| with testcontext() as u: |
| s.clear() |
| self.assertEqual(len(s), 0) |
| |
| def test_len_cycles(self): |
| N = 20 |
| items = [RefCycle() for i in range(N)] |
| s = WeakSet(items) |
| del items |
| it = iter(s) |
| try: |
| next(it) |
| except StopIteration: |
| pass |
| gc.collect() |
| n1 = len(s) |
| del it |
| gc.collect() |
| n2 = len(s) |
| # one item may be kept alive inside the iterator |
| self.assertIn(n1, (0, 1)) |
| self.assertEqual(n2, 0) |
| |
| def test_len_race(self): |
| # Extended sanity checks for len() in the face of cyclic collection |
| self.addCleanup(gc.set_threshold, *gc.get_threshold()) |
| for th in range(1, 100): |
| N = 20 |
| gc.collect(0) |
| gc.set_threshold(th, th, th) |
| items = [RefCycle() for i in range(N)] |
| s = WeakSet(items) |
| del items |
| # All items will be collected at next garbage collection pass |
| it = iter(s) |
| try: |
| next(it) |
| except StopIteration: |
| pass |
| n1 = len(s) |
| del it |
| n2 = len(s) |
| self.assertGreaterEqual(n1, 0) |
| self.assertLessEqual(n1, N) |
| self.assertGreaterEqual(n2, 0) |
| self.assertLessEqual(n2, n1) |
| |
| |
| def test_main(verbose=None): |
| support.run_unittest(TestWeakSet) |
| |
| if __name__ == "__main__": |
| test_main(verbose=True) |