import random
class BingoCage:
def __init__(self, items):
self._items = list(items)
random.shuffle(self._items)
def pick(self):
try:
return self._items.pop()
except IndexError:
raise LookupError('pick from empty BingoCage')
def __call__(self):
return self.pick()
A BingoCage does one thing: picks items from a shuffled list.
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