add missing sys

diff --git a/ch13/ansible/roles/mezzanine/files/wait_for_db.py b/ch13/ansible/roles/mezzanine/files/wait_for_db.py
index 272df6a..e549d14 100644 (file)
--- a/ch13/ansible/roles/mezzanine/files/wait_for_db.py
+++ b/ch13/ansible/roles/mezzanine/files/wait_for_db.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 import os
 import psycopg2
+import sys
 import time
 
 dbname = os.environ.get("DATABASE_NAME", ""),