Cleaning code

example/sender.py

@@ -18,7 +18,7 @@
 # api.wait(duration)                             # Wait for "duration" seconds of simulated time
 # api.turn_off(duration)                         # Turn the node off for "duration" seconds (no data can be receive during this time period)
 
-import sys, random
+import random
 
 # Note that the following is required to have different instance from thread to thread
 lr=random.Random(6)

example/simulator.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 # Load ESDS
-import sys
 import esds
 
 # Use numpy to construct bandwidth and latencies matrix