added chapter map to README

13-iface-abc/lotto.py

@@ -0,0 +1,30 @@
+# BEGIN LOTTERY_BLOWER
+
+import random
+
+from tombola import Tombola
+
+
+class LotteryBlower(Tombola):
+
+    def __init__(self, iterable):
+        self._balls = list(iterable)  # <1>
+
+    def load(self, iterable):
+        self._balls.extend(iterable)
+
+    def pick(self):
+        try:
+            position = random.randrange(len(self._balls))  # <2>
+        except ValueError:
+            raise LookupError('pick from empty BingoCage')
+        return self._balls.pop(position)  # <3>
+
+    def loaded(self):  # <4>
+        return bool(self._balls)
+
+    def inspect(self):  # <5>
+        return tuple(sorted(self._balls))
+
+
+# END LOTTERY_BLOWER