Method testSetattrWrapperNameIntern

Lib/test/test_class.py:656–674

(self)

    @cpython_only
    def testSetattrWrapperNameIntern(self):
        # Issue #25794: __setattr__ should intern the attribute name
        class A:
            pass

        def add(self, other):
            return 'summa'

        name = str(b'__add__', 'ascii')  # shouldn't be optimized
        self.assertIsNot(name, '__add__')  # not interned
        type.__setattr__(A, name, add)
        self.assertEqual(A() + 1, 'summa')

        name2 = str(b'__add__', 'ascii')
        self.assertIsNot(name2, '__add__')
        self.assertIsNot(name2, name)
        type.__delattr__(A, name2)
        with self.assertRaises(TypeError):
            A() + 1

    def testSetattrNonStringName(self):
        class A: