--- a/scripts/display-synced-trajectories.py	Fri May 25 18:15:18 2018 -0400
+++ b/scripts/display-synced-trajectories.py	Sun May 27 23:22:48 2018 -0400
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 import sys, argparse, os.path
 from datetime import datetime, timedelta
@@ -57,7 +57,7 @@
     sys.exit()
 
 if windowNames is None:
-    windowNames = ['frame{}'.format(i) for i in xrange(len(filenames))]
+    windowNames = ['frame{}'.format(i) for i in range(len(filenames))]
 #wait = 5
 #if rescale == 1.:
 for windowName in windowNames:
@@ -72,13 +72,13 @@
     key = -1
     ret = True
     nFramesShown = 0
-    for i in xrange(len(captures)):
+    for i in range(len(captures)):
         if firstFrameNums[i] > 0:
             captures[i].set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNums[i])
     while ret and not cvutils.quitKey(key):
         rets = []
         images = []
-        for i in xrange(len(captures)):
+        for i in range(len(captures)):
             if firstFrameNums[i]+nFramesShown>=0:
                 ret, img = captures[i].read()
                 if ret and args.undistort:
@@ -91,7 +91,7 @@
         if np.array(rets).any():
             #if printFrames:
             print('frame shown {0}'.format(nFramesShown))
-            for i in xrange(len(filenames)):
+            for i in range(len(filenames)):
                 if rets[i]:#firstFrameNums[i]+nFramesShown>=0:
                     for obj in objects:
                         if obj.existsAtInstant(mergedFirstFrameNum+nFramesShown):
@@ -111,7 +111,7 @@
             #    cv2.imwrite('image-{}.png'.format(frameNum), img)
         nFramesShown += args.step
         if args.step > 1:
-            for i in xrange(len(captures)):
+            for i in range(len(captures)):
                 if firstFrameNums[i]+nFramesShown >= 0:
                     captures[i].set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNums[i]+nFramesShown)
     cv2.destroyAllWindows()