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cpython/Lib/test/test_weakref.py

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import gc
import sys
import unittest
import UserList
import weakref
from test import test_support
class C:
def method(self):
pass
class Callable:
bar = None
def __call__(self, x):
self.bar = x
def create_function():
def f(): pass
return f
def create_bound_method():
return C().method
def create_unbound_method():
return C.method
class TestBase(unittest.TestCase):
def setUp(self):
self.cbcalled = 0
def callback(self, ref):
self.cbcalled += 1
class ReferencesTestCase(TestBase):
def test_basic_ref(self):
self.check_basic_ref(C)
self.check_basic_ref(create_function)
self.check_basic_ref(create_bound_method)
self.check_basic_ref(create_unbound_method)
# Just make sure the tp_repr handler doesn't raise an exception.
# Live reference:
o = C()
wr = weakref.ref(o)
`wr`
# Dead reference:
del o
`wr`
def test_basic_callback(self):
self.check_basic_callback(C)
self.check_basic_callback(create_function)
self.check_basic_callback(create_bound_method)
self.check_basic_callback(create_unbound_method)
def test_multiple_callbacks(self):
o = C()
ref1 = weakref.ref(o, self.callback)
ref2 = weakref.ref(o, self.callback)
del o
self.assert_(ref1() is None,
"expected reference to be invalidated")
self.assert_(ref2() is None,
"expected reference to be invalidated")
self.assert_(self.cbcalled == 2,
"callback not called the right number of times")
def test_multiple_selfref_callbacks(self):
# Make sure all references are invalidated before callbacks are called
#
# What's important here is that we're using the first
# reference in the callback invoked on the second reference
# (the most recently created ref is cleaned up first). This
# tests that all references to the object are invalidated
# before any of the callbacks are invoked, so that we only
# have one invocation of _weakref.c:cleanup_helper() active
# for a particular object at a time.
#
def callback(object, self=self):
self.ref()
c = C()
self.ref = weakref.ref(c, callback)
ref1 = weakref.ref(c, callback)
del c
def test_proxy_ref(self):
o = C()
o.bar = 1
ref1 = weakref.proxy(o, self.callback)
ref2 = weakref.proxy(o, self.callback)
del o
def check(proxy):
proxy.bar
self.assertRaises(weakref.ReferenceError, check, ref1)
self.assertRaises(weakref.ReferenceError, check, ref2)
self.assert_(self.cbcalled == 2)
def check_basic_ref(self, factory):
o = factory()
ref = weakref.ref(o)
self.assert_(ref() is not None,
"weak reference to live object should be live")
o2 = ref()
self.assert_(o is o2,
"<ref>() should return original object if live")
def check_basic_callback(self, factory):
self.cbcalled = 0
o = factory()
ref = weakref.ref(o, self.callback)
del o
self.assert_(self.cbcalled == 1,
"callback did not properly set 'cbcalled'")
self.assert_(ref() is None,
"ref2 should be dead after deleting object reference")
def test_ref_reuse(self):
o = C()
ref1 = weakref.ref(o)
# create a proxy to make sure that there's an intervening creation
# between these two; it should make no difference
proxy = weakref.proxy(o)
ref2 = weakref.ref(o)
self.assert_(ref1 is ref2,
"reference object w/out callback should be re-used")
o = C()
proxy = weakref.proxy(o)
ref1 = weakref.ref(o)
ref2 = weakref.ref(o)
self.assert_(ref1 is ref2,
"reference object w/out callback should be re-used")
self.assert_(weakref.getweakrefcount(o) == 2,
"wrong weak ref count for object")
del proxy
self.assert_(weakref.getweakrefcount(o) == 1,
"wrong weak ref count for object after deleting proxy")
def test_proxy_reuse(self):
o = C()
proxy1 = weakref.proxy(o)
ref = weakref.ref(o)
proxy2 = weakref.proxy(o)
self.assert_(proxy1 is proxy2,
"proxy object w/out callback should have been re-used")
def test_basic_proxy(self):
o = C()
self.check_proxy(o, weakref.proxy(o))
L = UserList.UserList()
p = weakref.proxy(L)
self.failIf(p, "proxy for empty UserList should be false")
p.append(12)
self.assertEqual(len(L), 1)
self.failUnless(p, "proxy for non-empty UserList should be true")
p[:] = [2, 3]
self.assertEqual(len(L), 2)
self.assertEqual(len(p), 2)
self.failUnless(3 in p,
"proxy didn't support __contains__() properly")
p[1] = 5
self.assertEqual(L[1], 5)
self.assertEqual(p[1], 5)
L2 = UserList.UserList(L)
p2 = weakref.proxy(L2)
self.assertEqual(p, p2)
## self.assertEqual(repr(L2), repr(p2))
L3 = UserList.UserList(range(10))
p3 = weakref.proxy(L3)
self.assertEqual(L3[:], p3[:])
self.assertEqual(L3[5:], p3[5:])
self.assertEqual(L3[:5], p3[:5])
self.assertEqual(L3[2:5], p3[2:5])
# The PyWeakref_* C API is documented as allowing either NULL or
# None as the value for the callback, where either means "no
# callback". The "no callback" ref and proxy objects are supposed
# to be shared so long as they exist by all callers so long as
# they are active. In Python 2.3.3 and earlier, this guaranttee
# was not honored, and was broken in different ways for
# PyWeakref_NewRef() and PyWeakref_NewProxy(). (Two tests.)
def test_shared_ref_without_callback(self):
self.check_shared_without_callback(weakref.ref)
def test_shared_proxy_without_callback(self):
self.check_shared_without_callback(weakref.proxy)
def check_shared_without_callback(self, makeref):
o = Object(1)
p1 = makeref(o, None)
p2 = makeref(o, None)
self.assert_(p1 is p2, "both callbacks were None in the C API")
del p1, p2
p1 = makeref(o)
p2 = makeref(o, None)
self.assert_(p1 is p2, "callbacks were NULL, None in the C API")
del p1, p2
p1 = makeref(o)
p2 = makeref(o)
self.assert_(p1 is p2, "both callbacks were NULL in the C API")
del p1, p2
p1 = makeref(o, None)
p2 = makeref(o)
self.assert_(p1 is p2, "callbacks were None, NULL in the C API")
def test_callable_proxy(self):
o = Callable()
ref1 = weakref.proxy(o)
self.check_proxy(o, ref1)
self.assert_(type(ref1) is weakref.CallableProxyType,
"proxy is not of callable type")
ref1('twinkies!')
self.assert_(o.bar == 'twinkies!',
"call through proxy not passed through to original")
ref1(x='Splat.')
self.assert_(o.bar == 'Splat.',
"call through proxy not passed through to original")
# expect due to too few args
self.assertRaises(TypeError, ref1)
# expect due to too many args
self.assertRaises(TypeError, ref1, 1, 2, 3)
def check_proxy(self, o, proxy):
o.foo = 1
self.assert_(proxy.foo == 1,
"proxy does not reflect attribute addition")
o.foo = 2
self.assert_(proxy.foo == 2,
"proxy does not reflect attribute modification")
del o.foo
self.assert_(not hasattr(proxy, 'foo'),
"proxy does not reflect attribute removal")
proxy.foo = 1
self.assert_(o.foo == 1,
"object does not reflect attribute addition via proxy")
proxy.foo = 2
self.assert_(
o.foo == 2,
"object does not reflect attribute modification via proxy")
del proxy.foo
self.assert_(not hasattr(o, 'foo'),
"object does not reflect attribute removal via proxy")
def test_proxy_deletion(self):
# Test clearing of SF bug #762891
class Foo:
result = None
def __delitem__(self, accessor):
self.result = accessor
g = Foo()
f = weakref.proxy(g)
del f[0]
self.assertEqual(f.result, 0)
def test_getweakrefcount(self):
o = C()
ref1 = weakref.ref(o)
ref2 = weakref.ref(o, self.callback)
self.assert_(weakref.getweakrefcount(o) == 2,
"got wrong number of weak reference objects")
proxy1 = weakref.proxy(o)
proxy2 = weakref.proxy(o, self.callback)
self.assert_(weakref.getweakrefcount(o) == 4,
"got wrong number of weak reference objects")
del ref1, ref2, proxy1, proxy2
self.assert_(weakref.getweakrefcount(o) == 0,
"weak reference objects not unlinked from"
" referent when discarded.")
# assumes ints do not support weakrefs
self.assert_(weakref.getweakrefcount(1) == 0,
"got wrong number of weak reference objects for int")
def test_getweakrefs(self):
o = C()
ref1 = weakref.ref(o, self.callback)
ref2 = weakref.ref(o, self.callback)
del ref1
self.assert_(weakref.getweakrefs(o) == [ref2],
"list of refs does not match")
o = C()
ref1 = weakref.ref(o, self.callback)
ref2 = weakref.ref(o, self.callback)
del ref2
self.assert_(weakref.getweakrefs(o) == [ref1],
"list of refs does not match")
del ref1
self.assert_(weakref.getweakrefs(o) == [],
"list of refs not cleared")
# assumes ints do not support weakrefs
self.assert_(weakref.getweakrefs(1) == [],
"list of refs does not match for int")
def test_newstyle_number_ops(self):
class F(float):
pass
f = F(2.0)
p = weakref.proxy(f)
self.assert_(p + 1.0 == 3.0)
self.assert_(1.0 + p == 3.0) # this used to SEGV
def test_callbacks_protected(self):
# Callbacks protected from already-set exceptions?
# Regression test for SF bug #478534.
class BogusError(Exception):
pass
data = {}
def remove(k):
del data[k]
def encapsulate():
f = lambda : ()
data[weakref.ref(f, remove)] = None
raise BogusError
try:
encapsulate()
except BogusError:
pass
else:
self.fail("exception not properly restored")
try:
encapsulate()
except BogusError:
pass
else:
self.fail("exception not properly restored")
def test_sf_bug_840829(self):
# "weakref callbacks and gc corrupt memory"
# subtype_dealloc erroneously exposed a new-style instance
# already in the process of getting deallocated to gc,
# causing double-deallocation if the instance had a weakref
# callback that triggered gc.
# If the bug exists, there probably won't be an obvious symptom
# in a release build. In a debug build, a segfault will occur
# when the second attempt to remove the instance from the "list
# of all objects" occurs.
import gc
class C(object):
pass
c = C()
wr = weakref.ref(c, lambda ignore: gc.collect())
del c
# There endeth the first part. It gets worse.
del wr
c1 = C()
c1.i = C()
wr = weakref.ref(c1.i, lambda ignore: gc.collect())
c2 = C()
c2.c1 = c1
del c1 # still alive because c2 points to it
# Now when subtype_dealloc gets called on c2, it's not enough just
# that c2 is immune from gc while the weakref callbacks associated
# with c2 execute (there are none in this 2nd half of the test, btw).
# subtype_dealloc goes on to call the base classes' deallocs too,
# so any gc triggered by weakref callbacks associated with anything
# torn down by a base class dealloc can also trigger double
# deallocation of c2.
del c2
def test_callback_in_cycle_1(self):
import gc
class J(object):
pass
class II(object):
def acallback(self, ignore):
self.J
I = II()
I.J = J
I.wr = weakref.ref(J, I.acallback)
# Now J and II are each in a self-cycle (as all new-style class
# objects are, since their __mro__ points back to them). I holds
# both a weak reference (I.wr) and a strong reference (I.J) to class
# J. I is also in a cycle (I.wr points to a weakref that references
# I.acallback). When we del these three, they all become trash, but
# the cycles prevent any of them from getting cleaned up immediately.
# Instead they have to wait for cyclic gc to deduce that they're
# trash.
#
# gc used to call tp_clear on all of them, and the order in which
# it does that is pretty accidental. The exact order in which we
# built up these things manages to provoke gc into running tp_clear
# in just the right order (I last). Calling tp_clear on II leaves
# behind an insane class object (its __mro__ becomes NULL). Calling
# tp_clear on J breaks its self-cycle, but J doesn't get deleted
# just then because of the strong reference from I.J. Calling
# tp_clear on I starts to clear I's __dict__, and just happens to
# clear I.J first -- I.wr is still intact. That removes the last
# reference to J, which triggers the weakref callback. The callback
# tries to do "self.J", and instances of new-style classes look up
# attributes ("J") in the class dict first. The class (II) wants to
# search II.__mro__, but that's NULL. The result was a segfault in
# a release build, and an assert failure in a debug build.
del I, J, II
gc.collect()
def test_callback_in_cycle_2(self):
import gc
# This is just like test_callback_in_cycle_1, except that II is an
# old-style class. The symptom is different then: an instance of an
# old-style class looks in its own __dict__ first. 'J' happens to
# get cleared from I.__dict__ before 'wr', and 'J' was never in II's
# __dict__, so the attribute isn't found. The difference is that
# the old-style II doesn't have a NULL __mro__ (it doesn't have any
# __mro__), so no segfault occurs. Instead it got:
# test_callback_in_cycle_2 (__main__.ReferencesTestCase) ...
# Exception exceptions.AttributeError:
# "II instance has no attribute 'J'" in <bound method II.acallback
# of <?.II instance at 0x00B9B4B8>> ignored
class J(object):
pass
class II:
def acallback(self, ignore):
self.J
I = II()
I.J = J
I.wr = weakref.ref(J, I.acallback)
del I, J, II
gc.collect()
def test_callback_in_cycle_3(self):
import gc
# This one broke the first patch that fixed the last two. In this
# case, the objects reachable from the callback aren't also reachable
# from the object (c1) *triggering* the callback: you can get to
# c1 from c2, but not vice-versa. The result was that c2's __dict__
# got tp_clear'ed by the time the c2.cb callback got invoked.
class C:
def cb(self, ignore):
self.me
self.c1
self.wr
c1, c2 = C(), C()
c2.me = c2
c2.c1 = c1
c2.wr = weakref.ref(c1, c2.cb)
del c1, c2
gc.collect()
def test_callback_in_cycle_4(self):
import gc
# Like test_callback_in_cycle_3, except c2 and c1 have different
# classes. c2's class (C) isn't reachable from c1 then, so protecting
# objects reachable from the dying object (c1) isn't enough to stop
# c2's class (C) from getting tp_clear'ed before c2.cb is invoked.
# The result was a segfault (C.__mro__ was NULL when the callback
# tried to look up self.me).
class C(object):
def cb(self, ignore):
self.me
self.c1
self.wr
class D:
pass
c1, c2 = D(), C()
c2.me = c2
c2.c1 = c1
c2.wr = weakref.ref(c1, c2.cb)
del c1, c2, C, D
gc.collect()
def test_callback_in_cycle_resurrection(self):
import gc
# Do something nasty in a weakref callback: resurrect objects
# from dead cycles. For this to be attempted, the weakref and
# its callback must also be part of the cyclic trash (else the
# objects reachable via the callback couldn't be in cyclic trash
# to begin with -- the callback would act like an external root).
# But gc clears trash weakrefs with callbacks early now, which
# disables the callbacks, so the callbacks shouldn't get called
# at all (and so nothing actually gets resurrected).
alist = []
class C(object):
def __init__(self, value):
self.attribute = value
def acallback(self, ignore):
alist.append(self.c)
c1, c2 = C(1), C(2)
c1.c = c2
c2.c = c1
c1.wr = weakref.ref(c2, c1.acallback)
c2.wr = weakref.ref(c1, c2.acallback)
def C_went_away(ignore):
alist.append("C went away")
wr = weakref.ref(C, C_went_away)
del c1, c2, C # make them all trash
self.assertEqual(alist, []) # del isn't enough to reclaim anything
gc.collect()
# c1.wr and c2.wr were part of the cyclic trash, so should have
# been cleared without their callbacks executing. OTOH, the weakref
# to C is bound to a function local (wr), and wasn't trash, so that
# callback should have been invoked when C went away.
self.assertEqual(alist, ["C went away"])
# The remaining weakref should be dead now (its callback ran).
self.assertEqual(wr(), None)
del alist[:]
gc.collect()
self.assertEqual(alist, [])
def test_callbacks_on_callback(self):
import gc
# Set up weakref callbacks *on* weakref callbacks.
alist = []
def safe_callback(ignore):
alist.append("safe_callback called")
class C(object):
def cb(self, ignore):
alist.append("cb called")
c, d = C(), C()
c.other = d
d.other = c
callback = c.cb
c.wr = weakref.ref(d, callback) # this won't trigger
d.wr = weakref.ref(callback, d.cb) # ditto
external_wr = weakref.ref(callback, safe_callback) # but this will
self.assert_(external_wr() is callback)
# The weakrefs attached to c and d should get cleared, so that
# C.cb is never called. But external_wr isn't part of the cyclic
# trash, and no cyclic trash is reachable from it, so safe_callback
# should get invoked when the bound method object callback (c.cb)
# -- which is itself a callback, and also part of the cyclic trash --
# gets reclaimed at the end of gc.
del callback, c, d, C
self.assertEqual(alist, []) # del isn't enough to clean up cycles
gc.collect()
self.assertEqual(alist, ["safe_callback called"])
self.assertEqual(external_wr(), None)
del alist[:]
gc.collect()
self.assertEqual(alist, [])
def test_gc_during_ref_creation(self):
self.check_gc_during_creation(weakref.ref)
def test_gc_during_proxy_creation(self):
self.check_gc_during_creation(weakref.proxy)
def check_gc_during_creation(self, makeref):
thresholds = gc.get_threshold()
gc.set_threshold(1, 1, 1)
gc.collect()
class A:
pass
def callback(*args):
pass
referenced = A()
a = A()
a.a = a
a.wr = makeref(referenced)
try:
# now make sure the object and the ref get labeled as
# cyclic trash:
a = A()
weakref.ref(referenced, callback)
finally:
gc.set_threshold(*thresholds)
class Object:
def __init__(self, arg):
self.arg = arg
def __repr__(self):
return "<Object %r>" % self.arg
class MappingTestCase(TestBase):
COUNT = 10
def test_weak_values(self):
#
# This exercises d.copy(), d.items(), d[], del d[], len(d).
#
dict, objects = self.make_weak_valued_dict()
for o in objects:
self.assert_(weakref.getweakrefcount(o) == 1,
"wrong number of weak references to %r!" % o)
self.assert_(o is dict[o.arg],
"wrong object returned by weak dict!")
items1 = dict.items()
items2 = dict.copy().items()
items1.sort()
items2.sort()
self.assert_(items1 == items2,
"cloning of weak-valued dictionary did not work!")
del items1, items2
self.assert_(len(dict) == self.COUNT)
del objects[0]
self.assert_(len(dict) == (self.COUNT - 1),
"deleting object did not cause dictionary update")
del objects, o
self.assert_(len(dict) == 0,
"deleting the values did not clear the dictionary")
# regression on SF bug #447152:
dict = weakref.WeakValueDictionary()
self.assertRaises(KeyError, dict.__getitem__, 1)
dict[2] = C()
self.assertRaises(KeyError, dict.__getitem__, 2)
def test_weak_keys(self):
#
# This exercises d.copy(), d.items(), d[] = v, d[], del d[],
# len(d), d.has_key().
#
dict, objects = self.make_weak_keyed_dict()
for o in objects:
self.assert_(weakref.getweakrefcount(o) == 1,
"wrong number of weak references to %r!" % o)
self.assert_(o.arg is dict[o],
"wrong object returned by weak dict!")
items1 = dict.items()
items2 = dict.copy().items()
self.assert_(set(items1) == set(items2),
"cloning of weak-keyed dictionary did not work!")
del items1, items2
self.assert_(len(dict) == self.COUNT)
del objects[0]
self.assert_(len(dict) == (self.COUNT - 1),
"deleting object did not cause dictionary update")
del objects, o
self.assert_(len(dict) == 0,
"deleting the keys did not clear the dictionary")
o = Object(42)
dict[o] = "What is the meaning of the universe?"
self.assert_(dict.has_key(o))
self.assert_(not dict.has_key(34))
def test_weak_keyed_iters(self):
dict, objects = self.make_weak_keyed_dict()
self.check_iters(dict)
def test_weak_valued_iters(self):
dict, objects = self.make_weak_valued_dict()
self.check_iters(dict)
def check_iters(self, dict):
# item iterator:
items = dict.items()
for item in dict.iteritems():
items.remove(item)
self.assert_(len(items) == 0, "iteritems() did not touch all items")
# key iterator, via __iter__():
keys = dict.keys()
for k in dict:
keys.remove(k)
self.assert_(len(keys) == 0, "__iter__() did not touch all keys")
# key iterator, via iterkeys():
keys = dict.keys()
for k in dict.iterkeys():
keys.remove(k)
self.assert_(len(keys) == 0, "iterkeys() did not touch all keys")
# value iterator:
values = dict.values()
for v in dict.itervalues():
values.remove(v)
self.assert_(len(values) == 0,
"itervalues() did not touch all values")
def test_make_weak_keyed_dict_from_dict(self):
o = Object(3)
dict = weakref.WeakKeyDictionary({o:364})
self.assert_(dict[o] == 364)
def test_make_weak_keyed_dict_from_weak_keyed_dict(self):
o = Object(3)
dict = weakref.WeakKeyDictionary({o:364})
dict2 = weakref.WeakKeyDictionary(dict)
self.assert_(dict[o] == 364)
def make_weak_keyed_dict(self):
dict = weakref.WeakKeyDictionary()
objects = map(Object, range(self.COUNT))
for o in objects:
dict[o] = o.arg
return dict, objects
def make_weak_valued_dict(self):
dict = weakref.WeakValueDictionary()
objects = map(Object, range(self.COUNT))
for o in objects:
dict[o.arg] = o
return dict, objects
def check_popitem(self, klass, key1, value1, key2, value2):
weakdict = klass()
weakdict[key1] = value1
weakdict[key2] = value2
self.assert_(len(weakdict) == 2)
k, v = weakdict.popitem()
self.assert_(len(weakdict) == 1)
if k is key1:
self.assert_(v is value1)
else:
self.assert_(v is value2)
k, v = weakdict.popitem()
self.assert_(len(weakdict) == 0)
if k is key1:
self.assert_(v is value1)
else:
self.assert_(v is value2)
def test_weak_valued_dict_popitem(self):
self.check_popitem(weakref.WeakValueDictionary,
"key1", C(), "key2", C())
def test_weak_keyed_dict_popitem(self):
self.check_popitem(weakref.WeakKeyDictionary,
C(), "value 1", C(), "value 2")
def check_setdefault(self, klass, key, value1, value2):
self.assert_(value1 is not value2,
"invalid test"
" -- value parameters must be distinct objects")
weakdict = klass()
o = weakdict.setdefault(key, value1)
self.assert_(o is value1)
self.assert_(weakdict.has_key(key))
self.assert_(weakdict.get(key) is value1)
self.assert_(weakdict[key] is value1)
o = weakdict.setdefault(key, value2)
self.assert_(o is value1)
self.assert_(weakdict.has_key(key))
self.assert_(weakdict.get(key) is value1)
self.assert_(weakdict[key] is value1)
def test_weak_valued_dict_setdefault(self):
self.check_setdefault(weakref.WeakValueDictionary,
"key", C(), C())
def test_weak_keyed_dict_setdefault(self):
self.check_setdefault(weakref.WeakKeyDictionary,
C(), "value 1", "value 2")
def check_update(self, klass, dict):
#
# This exercises d.update(), len(d), d.keys(), d.has_key(),
# d.get(), d[].
#
weakdict = klass()
weakdict.update(dict)
self.assert_(len(weakdict) == len(dict))
for k in weakdict.keys():
self.assert_(dict.has_key(k),
"mysterious new key appeared in weak dict")
v = dict.get(k)
self.assert_(v is weakdict[k])
self.assert_(v is weakdict.get(k))
for k in dict.keys():
self.assert_(weakdict.has_key(k),
"original key disappeared in weak dict")
v = dict[k]
self.assert_(v is weakdict[k])
self.assert_(v is weakdict.get(k))
def test_weak_valued_dict_update(self):
self.check_update(weakref.WeakValueDictionary,
{1: C(), 'a': C(), C(): C()})
def test_weak_keyed_dict_update(self):
self.check_update(weakref.WeakKeyDictionary,
{C(): 1, C(): 2, C(): 3})
def test_weak_keyed_delitem(self):
d = weakref.WeakKeyDictionary()
o1 = Object('1')
o2 = Object('2')
d[o1] = 'something'
d[o2] = 'something'
self.assert_(len(d) == 2)
del d[o1]
self.assert_(len(d) == 1)
self.assert_(d.keys() == [o2])
def test_weak_valued_delitem(self):
d = weakref.WeakValueDictionary()
o1 = Object('1')
o2 = Object('2')
d['something'] = o1
d['something else'] = o2
self.assert_(len(d) == 2)
del d['something']
self.assert_(len(d) == 1)
self.assert_(d.items() == [('something else', o2)])
def test_weak_keyed_bad_delitem(self):
d = weakref.WeakKeyDictionary()
o = Object('1')
# An attempt to delete an object that isn't there should raise
# KeyError. It didn't before 2.3.
self.assertRaises(KeyError, d.__delitem__, o)
self.assertRaises(KeyError, d.__getitem__, o)
# If a key isn't of a weakly referencable type, __getitem__ and
# __setitem__ raise TypeError. __delitem__ should too.
self.assertRaises(TypeError, d.__delitem__, 13)
self.assertRaises(TypeError, d.__getitem__, 13)
self.assertRaises(TypeError, d.__setitem__, 13, 13)
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 = weakref.WeakKeyDictionary()
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 = 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]
self.assertEqual(len(d), 0)
self.assertEqual(count, 2)
from test import mapping_tests
class WeakValueDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
"""Check that WeakValueDictionary conforms to the mapping protocol"""
__ref = {"key1":Object(1), "key2":Object(2), "key3":Object(3)}
type2test = weakref.WeakValueDictionary
def _reference(self):
return self.__ref.copy()
class WeakKeyDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
"""Check that WeakKeyDictionary conforms to the mapping protocol"""
__ref = {Object("key1"):1, Object("key2"):2, Object("key3"):3}
type2test = weakref.WeakKeyDictionary
def _reference(self):
return self.__ref.copy()
def test_main():
test_support.run_unittest(
ReferencesTestCase,
MappingTestCase,
WeakValueDictionaryTestCase,
WeakKeyDictionaryTestCase,
)
if __name__ == "__main__":
test_main()
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