Fix update method

Author: MrS0m30n3

test_twodict.py

@@ -416,6 +416,11 @@ def test_update_unordered(self):
     def test_update_raises(self):
         self.assertRaises(TypeError, self.tdict.update, [('a', 10)], [('b', 20)])
 
+    def test_update_from_other(self):
+        other = TwoWayOrderedDict([('a', 10), ('b', 20), ('c', 30)])
+        self.tdict.update(other)
+        self.assertViewEqualO(self.tdict.items(), [('a', 10), ('b', 20), ('c', 30)])
+
 
 class TestSetDefault(unittest.TestCase, ExtraAssertions):
 

twodict.py

@@ -237,7 +237,7 @@ def update(self, *args, **kwargs):
             raise TypeError("expected at most 1 arguments, got {0}".format(len(args)))
 
         for item in args:
-            if type(item) == dict:
+            if isinstance(item, dict):
                 item = item.items()
 
             for key, value in item: