updated contents from Atlas repo

interfaces/bingo.py

@@ -0,0 +1,19 @@
+import random
+
+from tombola import Tombola
+
+
+class BingoCage(Tombola):  # <1>
+
+    def __init__(self, items):
+        self._balls = list(items)  # <2>
+
+    def load(self, items):
+        self._balls.extend(items)
+
+    def pop(self):
+        try:
+            position = random.randrange(len(self._balls))  # <4>
+        except ValueError:
+            raise LookupError('pop from empty BingoCage')
+        return self._balls.pop(position)