36 lines
552 B
Python
36 lines
552 B
Python
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"""
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# tag::BINGO_DEMO[]
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>>> bingo = BingoCage(range(3))
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>>> bingo.pick()
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1
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>>> bingo()
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0
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>>> callable(bingo)
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True
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# end::BINGO_DEMO[]
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"""
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# tag::BINGO[]
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import random
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class BingoCage:
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def __init__(self, items):
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self._items = list(items) # <1>
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random.shuffle(self._items) # <2>
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def pick(self): # <3>
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try:
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return self._items.pop()
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except IndexError:
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raise LookupError('pick from empty BingoCage') # <4>
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def __call__(self): # <5>
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return self.pick()
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# end::BINGO[]
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