Use dict.values() instead of dict.items() where possible

(suggested in @spulec review)

moto/swf/models/__init__.py

@@ -113,7 +113,7 @@ class SWFBackend(BaseBackend):
         self._check_string(domain_name)
         self._check_string(name)
         self._check_string(version)
-        for _, value in kwargs.items():
+        for value in kwargs.values():
             self._check_none_or_string(value)
         domain = self._get_domain(domain_name)
         _type = domain.get_type(kind, name, version, ignore_empty=True)
@@ -148,7 +148,7 @@ class SWFBackend(BaseBackend):
         self._check_string(workflow_name)
         self._check_string(workflow_version)
         self._check_none_or_list_of_strings(tag_list)
-        for _, value in kwargs.items():
+        for value in kwargs.values():
             self._check_none_or_string(value)
 
         domain = self._get_domain(domain_name)

moto/swf/models/domain.py

@@ -63,8 +63,8 @@ class Domain(object):
 
     def find_types(self, kind, status):
         _all = []
-        for _, family in self.types[kind].items():
+        for family in self.types[kind].values():
-            for _, _type in family.items():
+            for _type in family.values():
                 if _type.status == status:
                     _all.append(_type)
         return _all
@@ -107,7 +107,7 @@ class Domain(object):
     @property
     def activity_tasks(self):
         _all = []
-        for _, tasks in self.activity_task_lists.items():
+        for tasks in self.activity_task_lists.values():
             _all += tasks
         return _all
 
@@ -119,6 +119,6 @@ class Domain(object):
     @property
     def decision_tasks(self):
         _all = []
-        for _, tasks in self.decision_task_lists.items():
+        for tasks in self.decision_task_lists.values():
             _all += tasks
         return _all