tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/examples/tracing/task_switch.py b/examples/tracing/task_switch.py
index 46d43ba..161edfb 100755
--- a/examples/tracing/task_switch.py
+++ b/examples/tracing/task_switch.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 # Copyright (c) PLUMgrid, Inc.
 # Licensed under the Apache License, Version 2.0 (the "License")