tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/tools/lib/uflow.py b/tools/lib/uflow.py
index 2bfe36b..63fab87 100755
--- a/tools/lib/uflow.py
+++ b/tools/lib/uflow.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 # @lint-avoid-python-3-compatibility-imports
 #
 # uflow  Trace method execution flow in high-level languages.