diff -urN --color a/bin/dev_appserver.py b/bin/dev_appserver.py
--- a/bin/dev_appserver.py	2020-01-23 19:38:55.457052071 -0800
+++ b/bin/dev_appserver.py	2020-01-23 19:41:10.211160929 -0800
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright 2015 Google Inc. All Rights Reserved.
 #