def test_property___isabstractmethod__descriptor(self):
for val in (True, False, [], [1], '', '1'):
class C(object):
def foo(self):
pass
foo.__isabstractmethod__ = val
foo = DynamicClassAttribute(foo)
self.assertIs(C.__dict__['foo'].__isabstractmethod__, bool(val))
# check that the DynamicClassAttribute's __isabstractmethod__ descriptor does the
# right thing when presented with a value that fails truth testing:
class NotBool(object):
def __bool__(self):
raise ValueError()
__len__ = __bool__
with self.assertRaises(ValueError):
class C(object):
def foo(self):
pass
foo.__isabstractmethod__ = NotBool()
foo = DynamicClassAttribute(foo)
python类DynamicClassAttribute()的实例源码
def test_property___isabstractmethod__descriptor(self):
for val in (True, False, [], [1], '', '1'):
class C(object):
def foo(self):
pass
foo.__isabstractmethod__ = val
foo = DynamicClassAttribute(foo)
self.assertIs(C.__dict__['foo'].__isabstractmethod__, bool(val))
# check that the DynamicClassAttribute's __isabstractmethod__ descriptor does the
# right thing when presented with a value that fails truth testing:
class NotBool(object):
def __nonzero__(self):
raise ValueError()
__len__ = __nonzero__
with self.assertRaises(ValueError):
class C(object):
def foo(self):
pass
foo.__isabstractmethod__ = NotBool()
foo = DynamicClassAttribute(foo)
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def test_abstract_virtual(self):
self.assertRaises(TypeError, ClassWithAbstractVirtualProperty)
self.assertRaises(TypeError, ClassWithPropertyAbstractVirtual)
class APV(ClassWithPropertyAbstractVirtual):
pass
self.assertRaises(TypeError, APV)
class AVP(ClassWithAbstractVirtualProperty):
pass
self.assertRaises(TypeError, AVP)
class Okay1(ClassWithAbstractVirtualProperty):
@DynamicClassAttribute
def color(self):
return self._color
def __init__(self):
self._color = 'cyan'
with self.assertRaises(AttributeError):
Okay1.color
self.assertEqual(Okay1().color, 'cyan')
class Okay2(ClassWithAbstractVirtualProperty):
@DynamicClassAttribute
def color(self):
return self._color
def __init__(self):
self._color = 'magenta'
with self.assertRaises(AttributeError):
Okay2.color
self.assertEqual(Okay2().color, 'magenta')
# Issue 5890: subclasses of DynamicClassAttribute do not preserve method __doc__ strings
def test_docstring_copy(self):
class Foo(object):
@PropertySub
def spam(self):
"""spam wrapped in DynamicClassAttribute subclass"""
return 1
self.assertEqual(
Foo.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
def test_property_setter_copies_getter_docstring(self):
class Foo(object):
def __init__(self): self._spam = 1
@PropertySub
def spam(self):
"""spam wrapped in DynamicClassAttribute subclass"""
return self._spam
@spam.setter
def spam(self, value):
"""this docstring is ignored"""
self._spam = value
foo = Foo()
self.assertEqual(foo.spam, 1)
foo.spam = 2
self.assertEqual(foo.spam, 2)
self.assertEqual(
Foo.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
class FooSub(Foo):
spam = Foo.__dict__['spam']
@spam.setter
def spam(self, value):
"""another ignored docstring"""
self._spam = 'eggs'
foosub = FooSub()
self.assertEqual(foosub.spam, 1)
foosub.spam = 7
self.assertEqual(foosub.spam, 'eggs')
self.assertEqual(
FooSub.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
def test_classify_DynamicClassAttribute(self):
class Meta(type):
def __getattr__(self, name):
if name == 'ham':
return 'spam'
return super().__getattr__(name)
class VA(metaclass=Meta):
@types.DynamicClassAttribute
def ham(self):
return 'eggs'
should_find_dca = inspect.Attribute('ham', 'data', VA, VA.__dict__['ham'])
self.assertIn(should_find_dca, inspect.classify_class_attrs(VA))
should_find_ga = inspect.Attribute('ham', 'data', Meta, 'spam')
self.assertIn(should_find_ga, inspect.classify_class_attrs(VA))
def test_getmembers_VirtualAttribute(self):
class M(type):
def __getattr__(cls, name):
if name == 'eggs':
return 'scrambled'
return super().__getattr__(name)
class A(metaclass=M):
@types.DynamicClassAttribute
def eggs(self):
return 'spam'
self.assertIn(('eggs', 'scrambled'), inspect.getmembers(A))
self.assertIn(('eggs', 'spam'), inspect.getmembers(A()))
def test_classVirtualAttribute(self):
class Thing(object):
@types.DynamicClassAttribute
def x(self):
return self._x
_x = object()
self.assertEqual(inspect.getattr_static(Thing, 'x'), Thing.__dict__['x'])
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def __reduce_ex__(self, proto):
return self.__class__, (self._value_, )
# DynamicClassAttribute is used to provide access to the `name` and
# `value` properties of enum members while keeping some measure of
# protection from modification, while still allowing for an enumeration
# to have members named `name` and `value`. This works because enumeration
# members are not set directly on the enum class -- __getattr__ is
# used to look them up.
def test_abstract_virtual(self):
self.assertRaises(TypeError, ClassWithAbstractVirtualProperty)
self.assertRaises(TypeError, ClassWithPropertyAbstractVirtual)
class APV(ClassWithPropertyAbstractVirtual):
pass
self.assertRaises(TypeError, APV)
class AVP(ClassWithAbstractVirtualProperty):
pass
self.assertRaises(TypeError, AVP)
class Okay1(ClassWithAbstractVirtualProperty):
@DynamicClassAttribute
def color(self):
return self._color
def __init__(self):
self._color = 'cyan'
with self.assertRaises(AttributeError):
Okay1.color
self.assertEqual(Okay1().color, 'cyan')
class Okay2(ClassWithAbstractVirtualProperty):
@DynamicClassAttribute
def color(self):
return self._color
def __init__(self):
self._color = 'magenta'
with self.assertRaises(AttributeError):
Okay2.color
self.assertEqual(Okay2().color, 'magenta')
# Issue 5890: subclasses of DynamicClassAttribute do not preserve method __doc__ strings
def test_docstring_copy(self):
class Foo(object):
@PropertySub
def spam(self):
"""spam wrapped in DynamicClassAttribute subclass"""
return 1
self.assertEqual(
Foo.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
def test_property_setter_copies_getter_docstring(self):
class Foo(object):
def __init__(self): self._spam = 1
@PropertySub
def spam(self):
"""spam wrapped in DynamicClassAttribute subclass"""
return self._spam
@spam.setter
def spam(self, value):
"""this docstring is ignored"""
self._spam = value
foo = Foo()
self.assertEqual(foo.spam, 1)
foo.spam = 2
self.assertEqual(foo.spam, 2)
self.assertEqual(
Foo.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
class FooSub(Foo):
spam = Foo.__dict__['spam']
@spam.setter
def spam(self, value):
"""another ignored docstring"""
self._spam = 'eggs'
foosub = FooSub()
self.assertEqual(foosub.spam, 1)
foosub.spam = 7
self.assertEqual(foosub.spam, 'eggs')
self.assertEqual(
FooSub.__dict__['spam'].__doc__,
"spam wrapped in DynamicClassAttribute subclass")
def test_classify_DynamicClassAttribute(self):
class Meta(type):
def __getattr__(self, name):
if name == 'ham':
return 'spam'
return super().__getattr__(name)
class VA(metaclass=Meta):
@types.DynamicClassAttribute
def ham(self):
return 'eggs'
should_find_dca = inspect.Attribute('ham', 'data', VA, VA.__dict__['ham'])
self.assertIn(should_find_dca, inspect.classify_class_attrs(VA))
should_find_ga = inspect.Attribute('ham', 'data', Meta, 'spam')
self.assertIn(should_find_ga, inspect.classify_class_attrs(VA))
def test_getmembers_VirtualAttribute(self):
class M(type):
def __getattr__(cls, name):
if name == 'eggs':
return 'scrambled'
return super().__getattr__(name)
class A(metaclass=M):
@types.DynamicClassAttribute
def eggs(self):
return 'spam'
self.assertIn(('eggs', 'scrambled'), inspect.getmembers(A))
self.assertIn(('eggs', 'spam'), inspect.getmembers(A()))
def test_classVirtualAttribute(self):
class Thing(object):
@types.DynamicClassAttribute
def x(self):
return self._x
_x = object()
self.assertEqual(inspect.getattr_static(Thing, 'x'), Thing.__dict__['x'])
def getmembers(object, predicate=None):
"""Return all members of an object as (name, value) pairs sorted by name.
Optionally, only return members that satisfy a given predicate."""
if isclass(object):
mro = (object,) + getmro(object)
else:
mro = ()
results = []
processed = set()
names = dir(object)
# :dd any DynamicClassAttributes to the list of names if object is a class;
# this may result in duplicate entries if, for example, a virtual
# attribute with the same name as a DynamicClassAttribute exists
try:
for base in object.__bases__:
for k, v in base.__dict__.items():
if isinstance(v, types.DynamicClassAttribute):
names.append(k)
except AttributeError:
pass
for key in names:
# First try to get the value via getattr. Some descriptors don't
# like calling their __get__ (see bug #1785), so fall back to
# looking in the __dict__.
try:
value = getattr(object, key)
# handle the duplicate key
if key in processed:
raise AttributeError
except AttributeError:
for base in mro:
if key in base.__dict__:
value = base.__dict__[key]
break
else:
# could be a (currently) missing slot member, or a buggy
# __dir__; discard and move on
continue
if not predicate or predicate(value):
results.append((key, value))
processed.add(key)
results.sort(key=lambda pair: pair[0])
return results
def getmembers(object, predicate=None):
"""Return all members of an object as (name, value) pairs sorted by name.
Optionally, only return members that satisfy a given predicate."""
if isclass(object):
mro = (object,) + getmro(object)
else:
mro = ()
results = []
processed = set()
names = dir(object)
# :dd any DynamicClassAttributes to the list of names if object is a class;
# this may result in duplicate entries if, for example, a virtual
# attribute with the same name as a DynamicClassAttribute exists
try:
for base in object.__bases__:
for k, v in base.__dict__.items():
if isinstance(v, types.DynamicClassAttribute):
names.append(k)
except AttributeError:
pass
for key in names:
# First try to get the value via getattr. Some descriptors don't
# like calling their __get__ (see bug #1785), so fall back to
# looking in the __dict__.
try:
value = getattr(object, key)
# handle the duplicate key
if key in processed:
raise AttributeError
except AttributeError:
for base in mro:
if key in base.__dict__:
value = base.__dict__[key]
break
else:
# could be a (currently) missing slot member, or a buggy
# __dir__; discard and move on
continue
if not predicate or predicate(value):
results.append((key, value))
processed.add(key)
results.sort(key=lambda pair: pair[0])
return results
