diff --git a/example/sender.py b/example/sender.py
index 8389c95..bf38d52 100644
--- a/example/sender.py
+++ b/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)
diff --git a/example/simulator.py b/example/simulator.py
index 12b7caa..20eb878 100755
--- a/example/simulator.py
+++ b/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