Fix some python2-isms in prep for python3

These ones should work in both versions so we don't have to do them as
part of a global change over.

Change-Id: I2177b329d385c50d706a50a750b6c115ea3ea7ae
diff --git a/frc971/control_loops/python/haptic_wheel.py b/frc971/control_loops/python/haptic_wheel.py
index 088b204..79c9c35 100755
--- a/frc971/control_loops/python/haptic_wheel.py
+++ b/frc971/control_loops/python/haptic_wheel.py
@@ -253,7 +253,7 @@
         observer.X_hat[0, 0] = data_radians[0]
 
     last_request_current = data_request_current[0]
-    kf_torques = [[] for i in xrange(num_kf)]
+    kf_torques = [[] for i in range(num_kf)]
     for angle, current, request_current in zip(data_radians, data_current,
                                                data_request_current):
         # Predict and correct all the parameter swept observers.