Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use __set_name__ method in localstack

Best Python code snippet using localstack_python

test_subclassinit.py

Source:test_subclassinit.py

...75        self.assertEqual(Left.calls, [])76        self.assertEqual(Right.calls, [])77    def test_set_name(self):78        class Descriptor:79            def __set_name__(self, owner, name):80                self.owner = owner81                self.name = name82        class A:83            d = Descriptor()84        self.assertEqual(A.d.name, "d")85        self.assertIs(A.d.owner, A)86    def test_set_name_metaclass(self):87        class Meta(type):88            def __new__(cls, name, bases, ns):89                ret = super().__new__(cls, name, bases, ns)90                self.assertEqual(ret.d.name, "d")91                self.assertIs(ret.d.owner, ret)92                return 093        class Descriptor:94            def __set_name__(self, owner, name):95                self.owner = owner96                self.name = name97        class A(metaclass=Meta):98            d = Descriptor()99        self.assertEqual(A, 0)100    def test_set_name_error(self):101        class Descriptor:102            def __set_name__(self, owner, name):103                1/0104        with self.assertRaises(RuntimeError) as cm:105            class NotGoingToWork:106                attr = Descriptor()107        exc = cm.exception108        self.assertRegex(str(exc), r'\bNotGoingToWork\b')109        self.assertRegex(str(exc), r'\battr\b')110        self.assertRegex(str(exc), r'\bDescriptor\b')111        self.assertIsInstance(exc.__cause__, ZeroDivisionError)112    def test_set_name_wrong(self):113        class Descriptor:114            def __set_name__(self):115                pass116        with self.assertRaises(RuntimeError) as cm:117            class NotGoingToWork:118                attr = Descriptor()119        exc = cm.exception120        self.assertRegex(str(exc), r'\bNotGoingToWork\b')121        self.assertRegex(str(exc), r'\battr\b')122        self.assertRegex(str(exc), r'\bDescriptor\b')123        self.assertIsInstance(exc.__cause__, TypeError)124    def test_set_name_lookup(self):125        resolved = []126        class NonDescriptor:127            def __getattr__(self, name):128                resolved.append(name)129        class A:130            d = NonDescriptor()131        self.assertNotIn('__set_name__', resolved,132                         '__set_name__ is looked up in instance dict')133    def test_set_name_init_subclass(self):134        class Descriptor:135            def __set_name__(self, owner, name):136                self.owner = owner137                self.name = name138        class Meta(type):139            def __new__(cls, name, bases, ns):140                self = super().__new__(cls, name, bases, ns)141                self.meta_owner = self.owner142                self.meta_name = self.name143                return self144        class A:145            def __init_subclass__(cls):146                cls.owner = cls.d.owner147                cls.name = cls.d.name148        class B(A, metaclass=Meta):149            d = Descriptor()150        self.assertIs(B.owner, B)151        self.assertEqual(B.name, 'd')152        self.assertIs(B.meta_owner, B)153        self.assertEqual(B.name, 'd')154    def test_set_name_modifying_dict(self):155        notified = []156        class Descriptor:157            def __set_name__(self, owner, name):158                setattr(owner, name + 'x', None)159                notified.append(name)160        class A:161            a = Descriptor()162            b = Descriptor()163            c = Descriptor()164            d = Descriptor()165            e = Descriptor()166        self.assertCountEqual(notified, ['a', 'b', 'c', 'd', 'e'])167    def test_errors(self):168        class MyMeta(type):169            pass170        with self.assertRaises(TypeError):171            class MyClass(metaclass=MyMeta, otherarg=1):...

bulkfood_v4.py

Source:bulkfood_v4.py

...39    # - self - descriptor instance,40    # - owner - the managed class,41    # - name - is the name of the attribute of owner, to which this42    #   descriptor instance was assigned in the class body of owner.43    def __set_name__(self, owner, name):44        # This is what the __init__ did in implementation without __set_name__45        self.storage_name = name46    # Same implementation as in the non-__set_name__ case.47    def __set__(self, instance, value):48        if value > 0:49            instance.__dict__[self.storage_name] = value50        else:51            msg = f'{self.storage_name} must be > 0'52            raise ValueError(msg)53    54    # __get__ isn't needed - the name of the storage attribute matches55    # the name of the managed attribute. There's no risk of a mistake,56    # missuse or malicious intent.57    # def __get__(self, instance, owner):...

main.py

Source:main.py

1from material import Material2from simulator import Simulator3def main():4    iron = Material(0, 1)5    iron.__set_name__("iron")6    iron_bar = Material(0, 15)7    iron_bar.__set_name__("iron-bar_1")8    iron_bar.add_material_to_recipe(iron, 5)9    iron_bar2 = Material(0, 8)10    iron_bar2.__set_name__("iron-bar_2")11    iron_bar2.add_material_to_recipe(iron, 5)12    iron_bolt = Material(0, 10)13    iron_bolt.__set_name__("iron-bolt")14    iron_bolt.add_material_to_recipe(iron_bar, 2)15    copper = Material(0, 2)16    copper.__set_name__("copper")17    copper_bar = Material(0, 8)18    copper_bar.__set_name__("copper-bar")19    copper_bar.add_material_to_recipe(copper, 5)20    plate = Material(0, 30)21    plate.__set_name__("plate")22    plate.add_material_to_recipe(iron_bolt, 1)23    plate.add_material_to_recipe(copper_bar, 3)24    simulator = Simulator(120, [iron, iron_bar, iron_bar2, iron_bolt, copper, copper_bar, plate])25    simulator.simulate()26if __name__ == "__main__":...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.