MAINT: Use dataframe.iteritems instead of iterkv.

iterkv is deprecated.

tests/pipeline/test_events.py

@@ -354,7 +354,7 @@ class EventsLoaderTestCase(WithAssetFinder,
         # from pandas won't be tz_localized.
         dates = self.trading_days.tz_localize(None)
 
-        for asset, asset_result in results.iterkv():
+        for asset, asset_result in results.iteritems():
             relevant_events = events[events.sid == asset.sid]
             self.assertEqual(len(relevant_events), 2)
 
@@ -397,7 +397,7 @@ class EventsLoaderTestCase(WithAssetFinder,
         # Remove timezone info from trading days, since the outputs
         # from pandas won't be tz_localized.
         dates = self.trading_days.tz_localize(None)
-        for asset, asset_result in results.iterkv():
+        for asset, asset_result in results.iteritems():
             relevant_events = events[events.sid == asset.sid]
             self.assertEqual(len(relevant_events), 2)