tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/tools/fileslower.py b/tools/fileslower.py
index 219a94a..e2830e9 100755
--- a/tools/fileslower.py
+++ b/tools/fileslower.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 # @lint-avoid-python-3-compatibility-imports
 #
 # fileslower  Trace slow synchronous file reads and writes.