Removes unused variables

main.py

@@ -128,10 +128,8 @@ def main(args):
                       trace=trace)
 
     progress = Progress(50, 500, 0.75)
-    time_per_tick = []
     while True:
         try:
-            line = '\r'
             for tick in progress:
                 until = tick / progress.ticks * trace.duration
                 env.run(until=until)