Use python3 print

One step closer to no more python2

Change-Id: I4dcfd7aef6e8bb3f9a04be7bc91c11749e2104f3
diff --git a/y2019/control_loops/python/drivetrain.py b/y2019/control_loops/python/drivetrain.py
index 4a68fde..0a1a90d 100644
--- a/y2019/control_loops/python/drivetrain.py
+++ b/y2019/control_loops/python/drivetrain.py
@@ -1,5 +1,6 @@
 #!/usr/bin/python
 
+from __future__ import print_function
 from frc971.control_loops.python import drivetrain
 import sys
 
@@ -41,7 +42,7 @@
     if FLAGS.plot:
         drivetrain.PlotDrivetrainMotions(kDrivetrain)
     elif len(argv) != 5:
-        print "Expected .h file name and .cc file name"
+        print("Expected .h file name and .cc file name")
     else:
         # Write the generated constants out to a file.
         drivetrain.WriteDrivetrain(argv[1:3], argv[3:5], 'y2019', kDrivetrain)