def test_unhashable():
'''Test `SleekCallArgs` on unhashable arguments.'''
sca_dict = {}
args = ([1, 2], {1: [1, 2]}, {'a', 1})
sca1 = SleekCallArgs(sca_dict, f, *args)
hash(sca1)
sca_dict[sca1] = 'meow'
del args
gc_tools.collect()
# GCed because there's a `set` in `args`, and it's weakreffable:
assert len(sca_dict) == 0
kwargs = {
'a': {1: 2},
'b': [
set(),
{frozenset((3, 4))}
]
}
sca2 = SleekCallArgs(sca_dict, f, **kwargs)
hash(sca2)
sca_dict[sca2] = 'meow'
del kwargs
gc_tools.collect()
# Not GCed because all objects in `kwargs` are not weakreffable:
assert len(sca_dict) == 1
def test():
'''Test the basic workings of `WeakKeyDefaultDict`.'''
wkd_dict = WeakKeyDefaultDict(default_factory=lambda: 7)
weakreffable_object_0 = WeakreffableObject()
weakreffable_object_1 = WeakreffableObject()
weakreffable_object_2 = WeakreffableObject()
weakreffable_object_3 = WeakreffableObject()
wkd_dict[weakreffable_object_0] = 2
assert wkd_dict[weakreffable_object_0] == 2
assert wkd_dict[weakreffable_object_1] == 7
assert wkd_dict[weakreffable_object_2] == 7
assert weakreffable_object_0 in wkd_dict
assert weakreffable_object_1 in wkd_dict
assert weakreffable_object_2 in wkd_dict
assert 'meow' not in wkd_dict
assert sorted(wkd_dict.items()) == sorted(wkd_dict.iteritems()) == sorted(
((weakreffable_object_0, 2),
(weakreffable_object_1, 7),
(weakreffable_object_2, 7), )
)
assert set(wkd_dict.iterkeys()) == set(wkd_dict.keys()) == \
set((ref() for ref in wkd_dict.iterkeyrefs())) == \
set((ref() for ref in wkd_dict.keyrefs())) == \
set((weakreffable_object_0, weakreffable_object_1,
weakreffable_object_2))
weakreffable_object_3 = WeakreffableObject()
wkd_dict[weakreffable_object_3] = 123
assert len(wkd_dict.keys()) == 4
del weakreffable_object_3
gc_tools.collect()
assert len(wkd_dict.keys()) == 3
assert wkd_dict.pop(weakreffable_object_2) == 7
assert len(wkd_dict) == 2
popped_key, popped_value = wkd_dict.popitem()
assert popped_key in (weakreffable_object_0, weakreffable_object_1)
assert popped_value in (2, 7)
weakreffable_object_4 = WeakreffableObject()
weakreffable_object_5 = WeakreffableObject()
weakreffable_object_6 = WeakreffableObject()
assert weakreffable_object_4 not in wkd_dict
wkd_dict.setdefault(weakreffable_object_4, 222)
assert wkd_dict[weakreffable_object_4] == 222
wkd_dict.update({weakreffable_object_5: 444,})
assert wkd_dict[weakreffable_object_5] == 444
def test_container_iterator(self):
# Bug #3680: tp_traverse was not implemented for dictiter objects
class C(object):
pass
iterators = (CuteSleekValueDict.iteritems,
CuteSleekValueDict.itervalues,
CuteSleekValueDict.iterkeys)
for i in iterators:
obj = C()
ref = weakref.ref(obj)
container = CuteSleekValueDict(null_callback, {obj: 1})
obj.x = i(container)
del obj, container
gc_tools.collect()
self.assertIs(ref(), None, "Cycle was not collected")
def test_weak_keyed_cascading_deletes(self):
# SF bug 742860. For some reason, before 2.3 __delitem__ iterated
# over the keys via self.data.iterkeys(). If things vanished from
# the dict during this (or got added), that caused a RuntimeError.
d = WeakKeyIdentityDict()
mutate = False
class C(object):
def __init__(self, i):
self.value = i
def __hash__(self):
return hash(self.value)
def __eq__(self, other):
if mutate:
# Side effect that mutates the dict, by removing the
# last strong reference to a key.
del objs[-1]
return self.value == other.value
objs = [C(i) for i in range(4)]
for o in objs:
d[o] = o.value
del o # now the only strong references to keys are in objs
# Find the order in which iterkeys sees the keys.
objs = list(d.keys())
# Reverse it, so that the iteration implementation of __delitem__
# has to keep looping to find the first object we delete.
objs.reverse()
# Turn on mutation in C.__eq__. The first time thru the loop,
# under the iterkeys() business the first comparison will delete
# the last item iterkeys() would see, and that causes a
# RuntimeError: dictionary changed size during iteration
# when the iterkeys() loop goes around to try comparing the next
# key. After this was fixed, it just deletes the last object *our*
# "for o in obj" loop would have gotten to.
mutate = True
count = 0
for o in objs:
count += 1
del d[o]
gc_tools.collect()
self.assertEqual(len(d), 0)
self.assertEqual(count, 2)
def test():
'''Test the basic workings of `SleekCallArgs`.'''
sca_dict = {}
args = (1, 2)
sca1 = SleekCallArgs(sca_dict, f, *args)
sca_dict[sca1] = 'meow'
del args
gc_tools.collect()
assert len(sca_dict) == 1
args = (1, A())
sca2 = SleekCallArgs(sca_dict, f, *args)
sca_dict[sca2] = 'meow'
del args
gc_tools.collect()
assert len(sca_dict) == 1
def test_one_by_one():
volatile_things = [A(), 1, 4.5, 'meow', u'woof', [1, 2], (1, 2), {1: 2},
{1, 2, 3}]
unvolatile_things = [__builtins__, list, type, sum]
# Using len(csvd) as our key; just to guarantee we're not running over an
# existing key.
while volatile_things:
volatile_thing = volatile_things.pop()
csvd = CuteSleekValueDict(counter)
if _is_weakreffable(volatile_thing):
csvd[len(csvd)] = volatile_thing
count = counter()
del volatile_thing
gc_tools.collect()
assert counter() == count + 2
else:
csvd[len(csvd)] = volatile_thing
count = counter()
del volatile_thing
gc_tools.collect()
assert counter() == count + 1
while unvolatile_things:
unvolatile_thing = unvolatile_things.pop()
csvd = CuteSleekValueDict(counter)
csvd[len(csvd)] = unvolatile_thing
count = counter()
del unvolatile_thing
gc_tools.collect()
assert counter() == count + 1
def test_weakref():
'''Test that `cache` weakrefs weakreffable arguments.'''
f = cache()(counting_func)
class A: pass
a = A()
result = f(a)
assert result == f(a) == f(a) == f(a)
a_ref = weakref.ref(a)
del a
gc_tools.collect()
assert a_ref() is None
a = A()
result = f(meow=a)
assert result == f(meow=a) == f(meow=a) == f(meow=a)
a_ref = weakref.ref(a)
del a
gc_tools.collect()
assert a_ref() is None
def test_sleek_ref():
'''Test the basic workings of `SleekRef`.'''
volatile_things = [A(), 1, 4.5, 'meow', u'woof', [1, 2], (1, 2), {1: 2},
set((1, 2, 3)), (None, 3, {None: 4})]
unvolatile_things = [__builtins__, type, sum, None]
# (Used to have `list` here too but Pypy 2.0b choked on it.)
while volatile_things:
volatile_thing = volatile_things.pop()
sleek_ref = SleekRef(volatile_thing, counter)
assert sleek_ref() is volatile_thing
if _is_weakreffable(volatile_thing):
count = counter()
del volatile_thing
gc_tools.collect()
assert counter() == count + 2
nose.tools.assert_raises(SleekRefDied, sleek_ref)
else:
count = counter()
del volatile_thing
gc_tools.collect()
assert counter() == count + 1
assert sleek_ref() is not None
while unvolatile_things:
unvolatile_thing = unvolatile_things.pop()
sleek_ref = SleekRef(unvolatile_thing, counter)
assert sleek_ref() is unvolatile_thing
count = counter()
del unvolatile_thing
gc_tools.collect()
assert counter() == count + 1
# Ensuring it will not raise `SleekRefDied`:
sleek_ref()
def assert_garbage_collected(indexes):
gc_tools.collect()
assert set(indexes) == garbage_collected
def assert_garbage_collected(indexes):
gc_tools.collect()
assert set(indexes) == garbage_collected