convert shebang lines: python -> python3
diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
index eebdd25..0df1fea 100644
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import unittest
 import os