diff --git a/moto/swf/models/__init__.py b/moto/swf/models/__init__.py
index 3b9129c2a..18db47e24 100644
--- a/moto/swf/models/__init__.py
+++ b/moto/swf/models/__init__.py
@@ -111,7 +111,7 @@ class SWFBackend(BaseBackend):
         self._check_string(domain_name)
         self._check_string(name)
         self._check_string(version)
-        for _, value in kwargs.iteritems():
+        for _, value in kwargs.items():
             self._check_none_or_string(value)
         domain = self._get_domain(domain_name)
         _type = domain.get_type(kind, name, version, ignore_empty=True)
@@ -146,7 +146,7 @@ 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.iteritems():
+        for _, value in kwargs.items():
             self._check_none_or_string(value)
 
         domain = self._get_domain(domain_name)
@@ -190,7 +190,7 @@ class SWFBackend(BaseBackend):
         #
         # TODO: handle long polling (case 2) for decision tasks
         candidates = []
-        for _task_list, tasks in domain.decision_task_lists.iteritems():
+        for _task_list, tasks in domain.decision_task_lists.items():
             if _task_list == task_list:
                 candidates += filter(lambda t: t.state == "SCHEDULED", tasks)
         if any(candidates):
@@ -290,7 +290,7 @@ class SWFBackend(BaseBackend):
         #
         # TODO: handle long polling (case 2) for activity tasks
         candidates = []
-        for _task_list, tasks in domain.activity_task_lists.iteritems():
+        for _task_list, tasks in domain.activity_task_lists.items():
             if _task_list == task_list:
                 candidates += filter(lambda t: t.state == "SCHEDULED", tasks)
         if any(candidates):
@@ -309,7 +309,7 @@ class SWFBackend(BaseBackend):
         self._process_timeouts()
         domain = self._get_domain(domain_name)
         count = 0
-        for _task_list, tasks in domain.activity_task_lists.iteritems():
+        for _task_list, tasks in domain.activity_task_lists.items():
             if _task_list == task_list:
                 pending = [t for t in tasks if t.state in ["SCHEDULED", "STARTED"]]
                 count += len(pending)
diff --git a/moto/swf/models/domain.py b/moto/swf/models/domain.py
index 066060b66..55bf1b8e8 100644
--- a/moto/swf/models/domain.py
+++ b/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].iteritems():
-            for _, _type in family.iteritems():
+        for _, family in self.types[kind].items():
+            for _, _type in family.items():
                 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.iteritems():
+        for _, tasks in self.activity_task_lists.items():
             _all += tasks
         return _all
 
@@ -119,6 +119,6 @@ class Domain(object):
     @property
     def decision_tasks(self):
         _all = []
-        for _, tasks in self.decision_task_lists.iteritems():
+        for _, tasks in self.decision_task_lists.items():
             _all += tasks
         return _all
diff --git a/moto/swf/models/generic_type.py b/moto/swf/models/generic_type.py
index 76fa98666..7c8389fbe 100644
--- a/moto/swf/models/generic_type.py
+++ b/moto/swf/models/generic_type.py
@@ -10,7 +10,7 @@ class GenericType(object):
         self.status = "REGISTERED"
         if "description" in kwargs:
             self.description = kwargs.pop("description")
-        for key, value in kwargs.iteritems():
+        for key, value in kwargs.items():
             self.__setattr__(key, value)
         # default values set to none
         for key in self._configuration_keys:
diff --git a/moto/swf/models/history_event.py b/moto/swf/models/history_event.py
index 176c92d7d..0b53f8659 100644
--- a/moto/swf/models/history_event.py
+++ b/moto/swf/models/history_event.py
@@ -10,7 +10,7 @@ class HistoryEvent(object):
         self.event_id = event_id
         self.event_type = event_type
         self.event_timestamp = now_timestamp()
-        for key, value in kwargs.iteritems():
+        for key, value in kwargs.items():
             self.__setattr__(key, value)
         # break soon if attributes are not valid
         self.event_attributes()
diff --git a/moto/swf/models/workflow_execution.py b/moto/swf/models/workflow_execution.py
index 8674d07fb..14523b079 100644
--- a/moto/swf/models/workflow_execution.py
+++ b/moto/swf/models/workflow_execution.py
@@ -256,7 +256,7 @@ class WorkflowExecution(object):
     def _check_decision_attributes(self, kind, value, decision_id):
         problems = []
         constraints = DECISIONS_FIELDS.get(kind, {})
-        for key, constraint in constraints.iteritems():
+        for key, constraint in constraints.items():
             if constraint["required"] and not value.get(key):
                 problems.append({
                     "type": "null_value",
diff --git a/tests/test_swf/test_utils.py b/tests/test_swf/test_utils.py
index 9f7da8857..f8ff08f22 100644
--- a/tests/test_swf/test_utils.py
+++ b/tests/test_swf/test_utils.py
@@ -13,7 +13,7 @@ def test_decapitalize():
         "FooBar": "fooBar",
         "FOO BAR": "fOO BAR",
     }
-    for before, after in cases.iteritems():
+    for before, after in cases.items():
         decapitalize(before).should.equal(after)
 
 @freeze_time("2015-01-01 12:00:00")
diff --git a/tests/test_swf/utils.py b/tests/test_swf/utils.py
index e6d73fe9a..70cbc4c13 100644
--- a/tests/test_swf/utils.py
+++ b/tests/test_swf/utils.py
@@ -29,7 +29,7 @@ SCHEDULE_ACTIVITY_TASK_DECISION = {
         "taskList": { "name": "activity-task-list" },
     }
 }
-for key, value in ACTIVITY_TASK_TIMEOUTS.iteritems():
+for key, value in ACTIVITY_TASK_TIMEOUTS.items():
     SCHEDULE_ACTIVITY_TASK_DECISION["scheduleActivityTaskDecisionAttributes"][key] = value
 
 # A test Domain