def test_with_binding_descriptor(self):
cls = type(mocks.ClassWithDescriptor(mocks.Binding(
mocks.Descriptor())))
result = get_descriptor(cls, attrname)
self.assertIs(result, cls.__dict__[attrname])
def name_of(descriptor, owner):
"""
Given a descriptor and a class that the descriptor is stored on, returns
the name of the attribute the descriptor is stored under.
Also works if the given class is a subclass of the class that *actually*
has the descriptor attribute
:param descriptor: descriptor the name is being looked up for
:param owner: class that "owns" the descriptor
:return: the name the descriptor is stored under on *owner*
"""
return _first(attr for attr in dir(owner)
if (get_descriptor(owner, attr) is descriptor))
def name_of(descriptor, owner):
"""
Given a descriptor and a class that the descriptor is stored on, returns
the name of the attribute the descriptor is stored under.
Also works if the given class is a subclass of the class that *actually*
has the descriptor attribute
:param descriptor: descriptor the name is being looked up for
:param owner: class that "owns" the descriptor
:return: the name the descriptor is stored under on *owner*
"""
name = _first(attr for attr in dir(owner)
if (get_descriptor(owner, attr) is descriptor))
if name is None:
raise RuntimeError(
str.format("The descriptor, '{}', does not exist on type, '{}'",
descriptor, owner.__qualname__))
return name
def test_with_superclass(self):
result = get_descriptor(SubClass, 'attr')
self.assertIs(result, Class.__dict__['attr'])
def test_with_superclass(self):
result = get_descriptor(SubClass, 'attr')
self.assertIs(result, Class.__dict__['attr'])
def test_with_binding_descriptor(self):
cls = type(mocks.ClassWithDescriptor(mocks.Binding(mocks.Descriptor())))
result = get_descriptor(cls, attrname)
self.assertIs(result, cls.__dict__[attrname])
