Set a default settings module

manage.py

@@ -1,7 +1,11 @@
 #!/usr/bin/env python
 import sys
+import os
+
 
 if __name__ == "__main__":
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'settings')
+
     from django.core.management import execute_from_command_line
 
     execute_from_command_line(sys.argv)