convert shebang lines: python -> python3
diff --git a/Tools/scripts/checkpyc.py b/Tools/scripts/checkpyc.py
index 2e8fd5a..2dc948a 100755
--- a/Tools/scripts/checkpyc.py
+++ b/Tools/scripts/checkpyc.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 # Check that all ".pyc" files exist and are up-to-date
 # Uses module 'os'