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16 lines
333 B
Python
16 lines
333 B
Python
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class DictOfSets(dict):
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def add(self, key, value):
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if key in self:
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self[key].add(value)
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else:
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self[key] = set([value])
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def discard(self, key, value):
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if not key in self:
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return
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self[key].discard(value)
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if not self[key]:
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del self[key]
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