add setdefault to DictObject, v2.8.7

CHANGELOG.md

 # v2.8.7
 
-* added setdefault to `DictObject`
+* added setdefault and get to `DictObject`
 

satella/__init__.py

-__version__ = '2.8.7_a2'
+__version__ = '2.8.7'

satella/coding/structures/dictionaries/dict_object.py

@@ -102,6 +102,12 @@ class DictObject(tp.MutableMapping[str, T]):
         else:
             return True
 
+    def get(self, k: str, v: tp.Optional[tp.Any] = None) -> tp.Any:
+        try:
+            return self.__data[k]
+        except KeyError:
+            return v
+
 
 def apply_dict_object(v: tp.Union[tp.Any, tp.Dict[str, T]]) -> tp.Union[DictObject, tp.Any]:
     """

tests/test_coding/test_structures.py

@@ -22,6 +22,9 @@ class TestMisc(unittest.TestCase):
         self.assertEqual(a.setdefault('k', 2), 2)
         self.assertEqual(a.k, 2)
 
+        self.assertIsNone(a.get('v'))
+        self.assertEqual(a.get('k'), 2)
+
     def test_expiration_dict_manual_expiring(self):
         eed = ExpiringEntryDict(expiration_timeout=5)
         eed['test'] = 2