1 files changed, 4 insertions, 0 deletions
diff --git a/Nitrate.py b/Nitrate.py
index 59a95dc..e47c13f 100644
--- a/Nitrate.py
+++ b/Nitrate.py
@@ -1123,6 +1123,10 @@ class Container(Mutable):
         """ Container 'in' operator. """
         return item in self._items
 
+    def __len__(self):
+        """ Number of container items. """
+        return len(self._items)
+
     def __str__(self):
         """ Display items as a list for printing. """
         if self._items: