update from Atlas with major reorg

11-iface-abc/drum.py

@@ -0,0 +1,17 @@
+from random import shuffle
+
+from tombola import Tombola
+
+
+class TumblingDrum(Tombola):
+
+    def __init__(self, iterable):
+        self._balls = []
+        self.load(iterable)
+
+    def load(self, iterable):
+        self._balls.extend(iterable)
+        shuffle(self._balls)
+
+    def pick(self):
+        return self._balls.pop()