convert shebang lines: python -> python3
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index edc9334..ef82d81 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 import os
 import os.path