class Dict(dict):

     def __init__(self, **kw):

         super().__init__(**kw)

     def __getattr__(self, key):

         try:

             return self[key]

         except KeyError:

             raise AttributeError(

                 r"'Dict' object has no attribute '%s'" % key)

     def __setattr__(self, key, value):

         self[key] = value

 import unittest

 from Dict import Dict

 class TestDict(unittest.TestCase):

     def setUp(self):

         print('setUp...')

     def tearDown(self):

         print('tearDown...')

     def test_init(self):

         d = Dict(a=1, b='test')

         self.assertEqual(d.a, 1)

         self.assertEqual(d.b, 'test')

         self.assertTrue(isinstance(d, dict))

     def test_key(self):

         d = Dict()

         d['key'] = 'value'

         self.assertEqual(d.key, 'value')

     def test_attr(self):

         d = Dict()

         d.key = 'value'

         self.assertTrue('key' in d)

         self.assertEqual(d['key'], 'value')

     def test_keyerror(self):

         d = Dict()

         with self.assertRaises(KeyError):

             value = d['empty']

             print(value)

     def test_attrerror(self):

         d = Dict()

         with self.assertRaises(AttributeError):

             value = d.empty

             print(value)

 if __name__ == '__main__':

     unittest.main()