Python inspect.getattr_static() Examples

def test_descriptor(self):
        class descriptor(object):
            def __get__(self, instance, owner):
                return 3
        class Foo(object):
            d = descriptor()

        foo = Foo()

        # for a non data descriptor we return the instance attribute
        foo.__dict__['d'] = 1
        self.assertEqual(inspect.getattr_static(foo, 'd'), 1)

        # if the descriptor is a data-desciptor we should return the
        # descriptor
        descriptor.__set__ = lambda s, i, v: None
        self.assertEqual(inspect.getattr_static(foo, 'd'), Foo.__dict__['d']) 

def test_metaclass_with_metaclass_with_dict_as_property(self):
        class MetaMeta(type):
            @property
            def __dict__(self):
                self.executed = True
                return dict(spam=42)

        class Meta(type, metaclass=MetaMeta):
            executed = False

        class Thing(metaclass=Meta):
            pass

        with self.assertRaises(AttributeError):
            inspect.getattr_static(Thing, "spam")
        self.assertFalse(Thing.executed) 

def test_metaclass(self):
        class meta(type):
            attr = 'foo'
        class Thing(object, metaclass=meta):
            pass
        self.assertEqual(inspect.getattr_static(Thing, 'attr'), 'foo')

        class sub(meta):
            pass
        class OtherThing(object, metaclass=sub):
            x = 3
        self.assertEqual(inspect.getattr_static(OtherThing, 'attr'), 'foo')

        class OtherOtherThing(OtherThing):
            pass
        # this test is odd, but it was added as it exposed a bug
        self.assertEqual(inspect.getattr_static(OtherOtherThing, 'x'), 3) 

def test_descriptor(self):
        class descriptor(object):
            def __get__(self, instance, owner):
                return 3
        class Foo(object):
            d = descriptor()

        foo = Foo()

        # for a non data descriptor we return the instance attribute
        foo.__dict__['d'] = 1
        self.assertEqual(inspect.getattr_static(foo, 'd'), 1)

        # if the descriptor is a data-desciptor we should return the
        # descriptor
        descriptor.__set__ = lambda s, i, v: None
        self.assertEqual(inspect.getattr_static(foo, 'd'), Foo.__dict__['d']) 

def test_metaclass_with_metaclass_with_dict_as_property(self):
        class MetaMeta(type):
            @property
            def __dict__(self):
                self.executed = True
                return dict(spam=42)

        class Meta(type, metaclass=MetaMeta):
            executed = False

        class Thing(metaclass=Meta):
            pass

        with self.assertRaises(AttributeError):
            inspect.getattr_static(Thing, "spam")
        self.assertFalse(Thing.executed) 

def test_metaclass(self):
        class meta(type):
            attr = 'foo'
        class Thing(object, metaclass=meta):
            pass
        self.assertEqual(inspect.getattr_static(Thing, 'attr'), 'foo')

        class sub(meta):
            pass
        class OtherThing(object, metaclass=sub):
            x = 3
        self.assertEqual(inspect.getattr_static(OtherThing, 'attr'), 'foo')

        class OtherOtherThing(OtherThing):
            pass
        # this test is odd, but it was added as it exposed a bug
        self.assertEqual(inspect.getattr_static(OtherOtherThing, 'x'), 3) 

def test_metaclass(self):
        class meta(type):
            attr = 'foo'
        class Thing(object, metaclass=meta):
            pass
        self.assertEqual(inspect.getattr_static(Thing, 'attr'), 'foo')

        class sub(meta):
            pass
        class OtherThing(object, metaclass=sub):
            x = 3
        self.assertEqual(inspect.getattr_static(OtherThing, 'attr'), 'foo')

        class OtherOtherThing(OtherThing):
            pass
        # this test is odd, but it was added as it exposed a bug
        self.assertEqual(inspect.getattr_static(OtherOtherThing, 'x'), 3) 

def test_descriptor(self):
        class descriptor(object):
            def __get__(self, instance, owner):
                return 3
        class Foo(object):
            d = descriptor()

        foo = Foo()

        # for a non data descriptor we return the instance attribute
        foo.__dict__['d'] = 1
        self.assertEqual(inspect.getattr_static(foo, 'd'), 1)

        # if the descriptor is a data-desciptor we should return the
        # descriptor
        descriptor.__set__ = lambda s, i, v: None
        self.assertEqual(inspect.getattr_static(foo, 'd'), Foo.__dict__['d']) 

def test_metaclass_with_metaclass_with_dict_as_property(self):
        class MetaMeta(type):
            @property
            def __dict__(self):
                self.executed = True
                return dict(spam=42)

        class Meta(type, metaclass=MetaMeta):
            executed = False

        class Thing(metaclass=Meta):
            pass

        with self.assertRaises(AttributeError):
            inspect.getattr_static(Thing, "spam")
        self.assertFalse(Thing.executed) 

def test_mro_as_property(self):
        class Meta(type):
            @property
            def __mro__(self):
                return (object,)

        class Base(object):
            foo = 3

        class Something(Base, metaclass=Meta):
            pass

        self.assertEqual(inspect.getattr_static(Something(), 'foo'), 3)
        self.assertEqual(inspect.getattr_static(Something, 'foo'), 3) 

def test_custom_object_dict(self):
        test = self
        test.called = False

        class Custom(dict):
            def get(self, key, default=None):
                test.called = True
                super().get(key, default)

        class Foo(object):
            a = 3
        foo = Foo()
        foo.__dict__ = Custom()
        self.assertEqual(inspect.getattr_static(foo, 'a'), 3)
        self.assertFalse(test.called) 

def get_all_static_functions(klass):
    check.invariant(sys.version_info >= (3,))

    def _yield_all():
        for attr_name in dir(klass):
            attr = inspect.getattr_static(klass, attr_name)
            if isinstance(attr, staticmethod):
                # the actual function is on the __func__ property
                yield attr.__func__

    return list(_yield_all()) 

def test_class_as_property(self):
        class Base(object):
            foo = 3

        class Something(Base):
            executed = False
            @property
            def __class__(self):
                self.executed = True
                return object

        instance = Something()
        self.assertEqual(inspect.getattr_static(instance, 'foo'), 3)
        self.assertFalse(instance.executed)
        self.assertEqual(inspect.getattr_static(Something, 'foo'), 3) 

def _property_names(self):
        """Return a set of the names of the properties defined on the model."""
        names = []
        for name in dir(self.model):
            attr = inspect.getattr_static(self.model, name)
            if isinstance(attr, property):
                names.append(name)
        return frozenset(names) 

def test_metaclass_dict_as_property(self):
        class Meta(type):
            @property
            def __dict__(self):
                self.executed = True

        class Thing(metaclass=Meta):
            executed = False

            def __init__(self):
                self.spam = 42

        instance = Thing()
        self.assertEqual(inspect.getattr_static(instance, "spam"), 42)
        self.assertFalse(Thing.executed) 

def test_module(self):
        sentinel = object()
        self.assertIsNot(inspect.getattr_static(sys, "version", sentinel),
                         sentinel) 

def __getattr__(self, name):
        # First look for a resource factory in the whole context chain
        for ctx in self.context_chain:
            factory = ctx._resource_factories_by_context_attr.get(name)
            if factory:
                return factory.generate_value(self)

        # When that fails, look directly for an attribute in the parents
        for ctx in self.context_chain[1:]:
            value = getattr_static(ctx, name, None)
            if value is not None:
                return getattr(ctx, name)

        raise AttributeError('no such context variable: {}'.format(name)) 

def test_metaclass_with_descriptor(self):
        class descriptor(object):
            def __get__(self, instance, owner):
                return 3
        class meta(type):
            d = descriptor()
        class Thing(object, metaclass=meta):
            pass
        self.assertEqual(inspect.getattr_static(Thing, 'd'), meta.__dict__['d']) 

def test_inherited_classattribute(self):
        class Thing(object):
            x = object()
        class OtherThing(Thing):
            pass

        self.assertEqual(inspect.getattr_static(OtherThing, 'x'), Thing.x) 

def test_instance_attr(self):
        class Thing(object):
            x = 2
            def __init__(self, x):
                self.x = x
        thing = Thing(3)
        self.assertEqual(inspect.getattr_static(thing, 'x'), 3)
        del thing.x
        self.assertEqual(inspect.getattr_static(thing, 'x'), 2) 

def test_inherited(self):
        class Thing(object):
            x = object()
        class OtherThing(Thing):
            pass

        something = OtherThing()
        self.assertEqual(inspect.getattr_static(something, 'x'), Thing.x) 

def test_basic(self):
        class Thing(object):
            x = object()

        thing = Thing()
        self.assertEqual(inspect.getattr_static(thing, 'x'), Thing.x)
        self.assertEqual(inspect.getattr_static(thing, 'x', None), Thing.x)
        with self.assertRaises(AttributeError):
            inspect.getattr_static(thing, 'y')

        self.assertEqual(inspect.getattr_static(thing, 'y', 3), 3) 

def get_func_in_mro(obj, code):
    """Attempt to find a function in a side-effect free way.

    This looks in obj's mro manually and does not invoke any descriptors.
    """
    val = getattr_static(obj, code.co_name, None)
    if val is None:
        return None
    if isinstance(val, (classmethod, staticmethod)):
        candidate = val.__func__
    elif isinstance(val, property) and (val.fset is None) and (val.fdel is None):
        candidate = val.fget
    else:
        candidate = val
    return if_same_code(candidate, code) 

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 _property_names(self):
        """Return a set of the names of the properties defined on the model."""
        names = []
        for name in dir(self.model):
            attr = inspect.getattr_static(self.model, name)
            if isinstance(attr, property):
                names.append(name)
        return frozenset(names) 

def test_module(self):
        sentinel = object()
        self.assertIsNot(inspect.getattr_static(sys, "version", sentinel),
                         sentinel) 

def test_metaclass_dict_as_property(self):
        class Meta(type):
            @property
            def __dict__(self):
                self.executed = True

        class Thing(metaclass=Meta):
            executed = False

            def __init__(self):
                self.spam = 42

        instance = Thing()
        self.assertEqual(inspect.getattr_static(instance, "spam"), 42)
        self.assertFalse(Thing.executed) 

def test_custom_object_dict(self):
        test = self
        test.called = False

        class Custom(dict):
            def get(self, key, default=None):
                test.called = True
                super().get(key, default)

        class Foo(object):
            a = 3
        foo = Foo()
        foo.__dict__ = Custom()
        self.assertEqual(inspect.getattr_static(foo, 'a'), 3)
        self.assertFalse(test.called) 

def test_mro_as_property(self):
        class Meta(type):
            @property
            def __mro__(self):
                return (object,)

        class Base(object):
            foo = 3

        class Something(Base, metaclass=Meta):
            pass

        self.assertEqual(inspect.getattr_static(Something(), 'foo'), 3)
        self.assertEqual(inspect.getattr_static(Something, 'foo'), 3) 

def test_class_as_property(self):
        class Base(object):
            foo = 3

        class Something(Base):
            executed = False
            @property
            def __class__(self):
                self.executed = True
                return object

        instance = Something()
        self.assertEqual(inspect.getattr_static(instance, 'foo'), 3)
        self.assertFalse(instance.executed)
        self.assertEqual(inspect.getattr_static(Something, 'foo'), 3)