now following correct style implementations for issue #647

Author: nayanpaa

tests/test_canvas_object.py

@@ -74,7 +74,9 @@ def test_set_attributes_with_content_type(self, m):
         self.canvas_object.set_attributes(attributes)
 
         self.assertTrue(hasattr(self.canvas_object, "content-type"))
-        self.assertEqual(getattr(self.canvas_object, 'content-type'), "application/json")
+        self.assertEqual(
+            getattr(self.canvas_object, "content-type"), "application/json"
+        )
         self.assertTrue(hasattr(self.canvas_object, "content_type"))
         self.assertEqual(self.canvas_object.content_type, "another_application/json")
         self.assertTrue(hasattr(self.canvas_object, "filename"))