mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
1141 lines
28 KiB
Python
1141 lines
28 KiB
Python
import copy
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import pickle
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import dis
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import threading
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import types
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import unittest
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from test.support import threading_helper, check_impl_detail
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# Skip this module on other interpreters, it is cpython specific:
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if check_impl_detail(cpython=False):
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raise unittest.SkipTest('implementation detail specific to cpython')
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import _testinternalcapi
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def disabling_optimizer(func):
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def wrapper(*args, **kwargs):
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old_opt = _testinternalcapi.get_optimizer()
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_testinternalcapi.set_optimizer(None)
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try:
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return func(*args, **kwargs)
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finally:
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_testinternalcapi.set_optimizer(old_opt)
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return wrapper
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class TestLoadSuperAttrCache(unittest.TestCase):
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def test_descriptor_not_double_executed_on_spec_fail(self):
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calls = []
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class Descriptor:
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def __get__(self, instance, owner):
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calls.append((instance, owner))
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return lambda: 1
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class C:
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d = Descriptor()
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class D(C):
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def f(self):
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return super().d()
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d = D()
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self.assertEqual(d.f(), 1) # warmup
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calls.clear()
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self.assertEqual(d.f(), 1) # try to specialize
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self.assertEqual(calls, [(d, D)])
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class TestLoadAttrCache(unittest.TestCase):
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def test_descriptor_added_after_optimization(self):
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class Descriptor:
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pass
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class C:
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def __init__(self):
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self.x = 1
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x = Descriptor()
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def f(o):
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return o.x
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o = C()
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for i in range(1025):
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assert f(o) == 1
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Descriptor.__get__ = lambda self, instance, value: 2
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Descriptor.__set__ = lambda *args: None
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self.assertEqual(f(o), 2)
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def test_metaclass_descriptor_added_after_optimization(self):
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class Descriptor:
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pass
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class Metaclass(type):
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attribute = Descriptor()
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class Class(metaclass=Metaclass):
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attribute = True
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def __get__(self, instance, owner):
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return False
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def __set__(self, instance, value):
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return None
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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Descriptor.__get__ = __get__
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Descriptor.__set__ = __set__
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for _ in range(1025):
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self.assertFalse(f())
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def test_metaclass_descriptor_shadows_class_attribute(self):
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class Metaclass(type):
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@property
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def attribute(self):
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return True
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class Class(metaclass=Metaclass):
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attribute = False
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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def test_metaclass_set_descriptor_after_optimization(self):
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class Metaclass(type):
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pass
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class Class(metaclass=Metaclass):
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attribute = True
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@property
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def attribute(self):
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return False
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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Metaclass.attribute = attribute
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for _ in range(1025):
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self.assertFalse(f())
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def test_metaclass_del_descriptor_after_optimization(self):
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class Metaclass(type):
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@property
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def attribute(self):
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return True
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class Class(metaclass=Metaclass):
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attribute = False
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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del Metaclass.attribute
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for _ in range(1025):
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self.assertFalse(f())
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def test_type_descriptor_shadows_attribute_method(self):
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class Class:
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mro = None
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def f():
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return Class.mro
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for _ in range(1025):
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self.assertIsNone(f())
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def test_type_descriptor_shadows_attribute_member(self):
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class Class:
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__base__ = None
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def f():
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return Class.__base__
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for _ in range(1025):
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self.assertIs(f(), object)
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def test_type_descriptor_shadows_attribute_getset(self):
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class Class:
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__name__ = "Spam"
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def f():
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return Class.__name__
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for _ in range(1025):
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self.assertEqual(f(), "Class")
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def test_metaclass_getattribute(self):
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class Metaclass(type):
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def __getattribute__(self, name):
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return True
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class Class(metaclass=Metaclass):
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attribute = False
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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def test_metaclass_swap(self):
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class OldMetaclass(type):
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@property
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def attribute(self):
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return True
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class NewMetaclass(type):
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@property
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def attribute(self):
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return False
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class Class(metaclass=OldMetaclass):
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pass
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def f():
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return Class.attribute
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for _ in range(1025):
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self.assertTrue(f())
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Class.__class__ = NewMetaclass
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for _ in range(1025):
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self.assertFalse(f())
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def test_load_shadowing_slot_should_raise_type_error(self):
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class Class:
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__slots__ = ("slot",)
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class Sneaky:
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__slots__ = ("shadowed",)
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shadowing = Class.slot
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def f(o):
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o.shadowing
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o = Sneaky()
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o.shadowed = 42
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for _ in range(1025):
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with self.assertRaises(TypeError):
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f(o)
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def test_store_shadowing_slot_should_raise_type_error(self):
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class Class:
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__slots__ = ("slot",)
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class Sneaky:
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__slots__ = ("shadowed",)
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shadowing = Class.slot
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def f(o):
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o.shadowing = 42
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o = Sneaky()
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for _ in range(1025):
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with self.assertRaises(TypeError):
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f(o)
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def test_load_borrowed_slot_should_not_crash(self):
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class Class:
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__slots__ = ("slot",)
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class Sneaky:
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borrowed = Class.slot
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def f(o):
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o.borrowed
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o = Sneaky()
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for _ in range(1025):
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with self.assertRaises(TypeError):
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f(o)
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def test_store_borrowed_slot_should_not_crash(self):
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class Class:
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__slots__ = ("slot",)
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class Sneaky:
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borrowed = Class.slot
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def f(o):
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o.borrowed = 42
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o = Sneaky()
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for _ in range(1025):
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with self.assertRaises(TypeError):
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f(o)
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class TestLoadMethodCache(unittest.TestCase):
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def test_descriptor_added_after_optimization(self):
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class Descriptor:
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pass
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class Class:
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attribute = Descriptor()
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def __get__(self, instance, owner):
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return lambda: False
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def __set__(self, instance, value):
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return None
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def attribute():
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return True
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instance = Class()
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instance.attribute = attribute
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def f():
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return instance.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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Descriptor.__get__ = __get__
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Descriptor.__set__ = __set__
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for _ in range(1025):
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self.assertFalse(f())
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def test_metaclass_descriptor_added_after_optimization(self):
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class Descriptor:
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pass
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class Metaclass(type):
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attribute = Descriptor()
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class Class(metaclass=Metaclass):
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def attribute():
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return True
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def __get__(self, instance, owner):
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return lambda: False
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def __set__(self, instance, value):
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return None
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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Descriptor.__get__ = __get__
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Descriptor.__set__ = __set__
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for _ in range(1025):
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self.assertFalse(f())
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def test_metaclass_descriptor_shadows_class_attribute(self):
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class Metaclass(type):
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@property
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def attribute(self):
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return lambda: True
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class Class(metaclass=Metaclass):
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def attribute():
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return False
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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def test_metaclass_set_descriptor_after_optimization(self):
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class Metaclass(type):
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pass
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class Class(metaclass=Metaclass):
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def attribute():
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return True
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@property
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def attribute(self):
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return lambda: False
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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Metaclass.attribute = attribute
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for _ in range(1025):
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self.assertFalse(f())
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def test_metaclass_del_descriptor_after_optimization(self):
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class Metaclass(type):
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@property
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def attribute(self):
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return lambda: True
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class Class(metaclass=Metaclass):
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def attribute():
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return False
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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del Metaclass.attribute
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for _ in range(1025):
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self.assertFalse(f())
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def test_type_descriptor_shadows_attribute_method(self):
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class Class:
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def mro():
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return ["Spam", "eggs"]
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def f():
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return Class.mro()
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for _ in range(1025):
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self.assertEqual(f(), ["Spam", "eggs"])
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def test_type_descriptor_shadows_attribute_member(self):
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class Class:
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def __base__():
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return "Spam"
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def f():
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return Class.__base__()
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for _ in range(1025):
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self.assertNotEqual(f(), "Spam")
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def test_metaclass_getattribute(self):
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class Metaclass(type):
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def __getattribute__(self, name):
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return lambda: True
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class Class(metaclass=Metaclass):
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def attribute():
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return False
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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def test_metaclass_swap(self):
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class OldMetaclass(type):
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@property
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def attribute(self):
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return lambda: True
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class NewMetaclass(type):
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@property
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def attribute(self):
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return lambda: False
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class Class(metaclass=OldMetaclass):
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pass
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def f():
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return Class.attribute()
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for _ in range(1025):
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self.assertTrue(f())
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Class.__class__ = NewMetaclass
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for _ in range(1025):
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self.assertFalse(f())
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class TestCallCache(unittest.TestCase):
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def test_too_many_defaults_0(self):
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def f():
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pass
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f.__defaults__ = (None,)
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for _ in range(1025):
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f()
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def test_too_many_defaults_1(self):
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def f(x):
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pass
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f.__defaults__ = (None, None)
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for _ in range(1025):
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f(None)
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f()
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def test_too_many_defaults_2(self):
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def f(x, y):
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pass
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f.__defaults__ = (None, None, None)
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for _ in range(1025):
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f(None, None)
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f(None)
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f()
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@threading_helper.requires_working_threading()
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class TestRacesDoNotCrash(unittest.TestCase):
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# Careful with these. Bigger numbers have a higher chance of catching bugs,
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# but you can also burn through a *ton* of type/dict/function versions:
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ITEMS = 1000
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LOOPS = 4
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WARMUPS = 2
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WRITERS = 2
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def assert_specialized(self, f, opname):
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instructions = dis.get_instructions(f, adaptive=True)
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opnames = {instruction.opname for instruction in instructions}
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self.assertIn(opname, opnames)
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@disabling_optimizer
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def assert_races_do_not_crash(
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self, opname, get_items, read, write, *, check_items=False
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):
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# This might need a few dozen loops in some cases:
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for _ in range(self.LOOPS):
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items = get_items()
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# Reset:
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if check_items:
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for item in items:
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item.__code__ = item.__code__.replace()
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else:
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read.__code__ = read.__code__.replace()
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# Specialize:
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for _ in range(self.WARMUPS):
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read(items)
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if check_items:
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for item in items:
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self.assert_specialized(item, opname)
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else:
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self.assert_specialized(read, opname)
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# Create writers:
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writers = []
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for _ in range(self.WRITERS):
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writer = threading.Thread(target=write, args=[items])
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writers.append(writer)
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# Run:
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for writer in writers:
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writer.start()
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read(items) # BOOM!
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for writer in writers:
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writer.join()
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def test_binary_subscr_getitem(self):
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def get_items():
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class C:
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__getitem__ = lambda self, item: None
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items = []
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for _ in range(self.ITEMS):
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item = C()
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items.append(item)
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return items
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def read(items):
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for item in items:
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try:
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item[None]
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except TypeError:
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pass
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def write(items):
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for item in items:
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try:
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del item.__getitem__
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except AttributeError:
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pass
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type(item).__getitem__ = lambda self, item: None
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opname = "BINARY_SUBSCR_GETITEM"
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self.assert_races_do_not_crash(opname, get_items, read, write)
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def test_binary_subscr_list_int(self):
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def get_items():
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items = []
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for _ in range(self.ITEMS):
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item = [None]
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items.append(item)
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return items
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def read(items):
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for item in items:
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try:
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item[0]
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except IndexError:
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pass
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|
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def write(items):
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for item in items:
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item.clear()
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item.append(None)
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opname = "BINARY_SUBSCR_LIST_INT"
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self.assert_races_do_not_crash(opname, get_items, read, write)
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|
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def test_for_iter_gen(self):
|
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def get_items():
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def g():
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yield
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yield
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items = []
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for _ in range(self.ITEMS):
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item = g()
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items.append(item)
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return items
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|
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def read(items):
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for item in items:
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try:
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for _ in item:
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break
|
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except ValueError:
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pass
|
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|
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def write(items):
|
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for item in items:
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try:
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for _ in item:
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break
|
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except ValueError:
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pass
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|
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opname = "FOR_ITER_GEN"
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self.assert_races_do_not_crash(opname, get_items, read, write)
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|
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def test_for_iter_list(self):
|
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def get_items():
|
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items = []
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for _ in range(self.ITEMS):
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item = [None]
|
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items.append(item)
|
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return items
|
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|
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def read(items):
|
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for item in items:
|
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for item in item:
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break
|
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|
|
def write(items):
|
|
for item in items:
|
|
item.clear()
|
|
item.append(None)
|
|
|
|
opname = "FOR_ITER_LIST"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_class(self):
|
|
def get_items():
|
|
class C:
|
|
a = object()
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.a
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del item.a
|
|
except AttributeError:
|
|
pass
|
|
item.a = object()
|
|
|
|
opname = "LOAD_ATTR_CLASS"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_getattribute_overridden(self):
|
|
def get_items():
|
|
class C:
|
|
__getattribute__ = lambda self, name: None
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.a
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del item.__getattribute__
|
|
except AttributeError:
|
|
pass
|
|
type(item).__getattribute__ = lambda self, name: None
|
|
|
|
opname = "LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_instance_value(self):
|
|
def get_items():
|
|
class C:
|
|
pass
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
item.a = None
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
item.a
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.__dict__[None] = None
|
|
|
|
opname = "LOAD_ATTR_INSTANCE_VALUE"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_method_lazy_dict(self):
|
|
def get_items():
|
|
class C(Exception):
|
|
m = lambda self: None
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.m()
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del item.m
|
|
except AttributeError:
|
|
pass
|
|
type(item).m = lambda self: None
|
|
|
|
opname = "LOAD_ATTR_METHOD_LAZY_DICT"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_method_no_dict(self):
|
|
def get_items():
|
|
class C:
|
|
__slots__ = ()
|
|
m = lambda self: None
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.m()
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del item.m
|
|
except AttributeError:
|
|
pass
|
|
type(item).m = lambda self: None
|
|
|
|
opname = "LOAD_ATTR_METHOD_NO_DICT"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_method_with_values(self):
|
|
def get_items():
|
|
class C:
|
|
m = lambda self: None
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.m()
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del item.m
|
|
except AttributeError:
|
|
pass
|
|
type(item).m = lambda self: None
|
|
|
|
opname = "LOAD_ATTR_METHOD_WITH_VALUES"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_module(self):
|
|
def get_items():
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = types.ModuleType("<item>")
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.__name__
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
d = item.__dict__.copy()
|
|
item.__dict__.clear()
|
|
item.__dict__.update(d)
|
|
|
|
opname = "LOAD_ATTR_MODULE"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_property(self):
|
|
def get_items():
|
|
class C:
|
|
a = property(lambda self: None)
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item.a
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
try:
|
|
del type(item).a
|
|
except AttributeError:
|
|
pass
|
|
type(item).a = property(lambda self: None)
|
|
|
|
opname = "LOAD_ATTR_PROPERTY"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_attr_with_hint(self):
|
|
def get_items():
|
|
class C:
|
|
pass
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
item.a = None
|
|
# Resize into a combined unicode dict:
|
|
for i in range(29):
|
|
setattr(item, f"_{i}", None)
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
item.a
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.__dict__[None] = None
|
|
|
|
opname = "LOAD_ATTR_WITH_HINT"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_load_global_module(self):
|
|
def get_items():
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = eval("lambda: x", {"x": None})
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
item()
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.__globals__[None] = None
|
|
|
|
opname = "LOAD_GLOBAL_MODULE"
|
|
self.assert_races_do_not_crash(
|
|
opname, get_items, read, write, check_items=True
|
|
)
|
|
|
|
def test_store_attr_instance_value(self):
|
|
def get_items():
|
|
class C:
|
|
pass
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
item.a = None
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.__dict__[None] = None
|
|
|
|
opname = "STORE_ATTR_INSTANCE_VALUE"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_store_attr_with_hint(self):
|
|
def get_items():
|
|
class C:
|
|
pass
|
|
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = C()
|
|
# Resize into a combined unicode dict:
|
|
for i in range(29):
|
|
setattr(item, f"_{i}", None)
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
item.a = None
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.__dict__[None] = None
|
|
|
|
opname = "STORE_ATTR_WITH_HINT"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_store_subscr_list_int(self):
|
|
def get_items():
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = [None]
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
item[0] = None
|
|
except IndexError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.clear()
|
|
item.append(None)
|
|
|
|
opname = "STORE_SUBSCR_LIST_INT"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
def test_unpack_sequence_list(self):
|
|
def get_items():
|
|
items = []
|
|
for _ in range(self.ITEMS):
|
|
item = [None]
|
|
items.append(item)
|
|
return items
|
|
|
|
def read(items):
|
|
for item in items:
|
|
try:
|
|
[_] = item
|
|
except ValueError:
|
|
pass
|
|
|
|
def write(items):
|
|
for item in items:
|
|
item.clear()
|
|
item.append(None)
|
|
|
|
opname = "UNPACK_SEQUENCE_LIST"
|
|
self.assert_races_do_not_crash(opname, get_items, read, write)
|
|
|
|
class C:
|
|
pass
|
|
|
|
class TestInstanceDict(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
c = C()
|
|
c.a, c.b, c.c = 0,0,0
|
|
|
|
def test_values_on_instance(self):
|
|
c = C()
|
|
c.a = 1
|
|
C().b = 2
|
|
c.c = 3
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
(1, '<NULL>', 3)
|
|
)
|
|
|
|
def test_dict_materialization(self):
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
c.__dict__
|
|
self.assertIs(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
None
|
|
)
|
|
|
|
def test_dict_dematerialization(self):
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
c.__dict__
|
|
self.assertIs(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
None
|
|
)
|
|
for _ in range(100):
|
|
c.a
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
|
|
def test_dict_dematerialization_multiple_refs(self):
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
d = c.__dict__
|
|
for _ in range(100):
|
|
c.a
|
|
self.assertIs(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
None
|
|
)
|
|
self.assertIs(c.__dict__, d)
|
|
|
|
def test_dict_dematerialization_copy(self):
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
c2 = copy.copy(c)
|
|
for _ in range(100):
|
|
c.a
|
|
c2.a
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c2),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
c3 = copy.deepcopy(c)
|
|
for _ in range(100):
|
|
c.a
|
|
c3.a
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
#NOTE -- c3.__dict__ does not de-materialize
|
|
|
|
def test_dict_dematerialization_pickle(self):
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
c2 = pickle.loads(pickle.dumps(c))
|
|
for _ in range(100):
|
|
c.a
|
|
c2.a
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
self.assertEqual(
|
|
_testinternalcapi.get_object_dict_values(c2),
|
|
(1, 2, '<NULL>')
|
|
)
|
|
|
|
def test_dict_dematerialization_subclass(self):
|
|
class D(dict): pass
|
|
c = C()
|
|
c.a = 1
|
|
c.b = 2
|
|
c.__dict__ = D(c.__dict__)
|
|
for _ in range(100):
|
|
c.a
|
|
self.assertIs(
|
|
_testinternalcapi.get_object_dict_values(c),
|
|
None
|
|
)
|
|
self.assertEqual(
|
|
c.__dict__,
|
|
{'a':1, 'b':2}
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|