--- a/python/poly-utils.py	Fri Jun 01 10:43:23 2018 -0400
+++ b/python/poly-utils.py	Fri Jun 01 10:47:49 2018 -0400
@@ -23,7 +23,7 @@
     inter = Interaction(interactionNum, TimeInterval(indicatorFrameNums[0],indicatorFrameNums[-1]), roaduserNum1, roaduserNum2) 
     inter.addVideoFilename(videoFilename)
     inter.addInteractionType(interactionType)
-    for key in indicatorsNames.keys():
+    for key in indicatorsNames:
         values= {}
         for i,t in enumerate(indicatorFrameNums):
             values[t] = data[i,key]
@@ -115,7 +115,7 @@
                     values[k]=v
                 return SeverityIndicator(indicatorName, values, mostSevereIsMax = False, maxValue = 1.), roadUserData
             else:
-                for i in xrange(time[0],time[-1]+1):
+                for i in range(time[0],time[-1]+1):
                     try:
                         tmp = getDataAtInstant(roadUserData, i)
                         values[i] = np.sum(tmp[:,5]*tmp[:,6])/np.sum(tmp[:,5])/frameRate