Add helper function to append to list value

1 files changed, 4 insertions, 0 deletions

diff --git a/lib.py b/lib.py
index 42aede6..6a8a067 100644
--- a/lib.py
+++ b/lib.py
@@ -12,6 +12,10 @@ datadir = os.environ['DATADIR']
 vars = Variables(datadir)
 
 
+def append(key, value):
+    items = vars[key] or []
+    items.append(value)
+    vars[key] = items
 
 
 def ssh_key_file_for_user(user):