Created
January 11, 2015 20:33
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| class OptimisticDict(dict): | |
| def __init__(self, factory_func): | |
| self.factory_func = factory_func | |
| super(OptimisticDict, self).__init__() | |
| def __missing__(self, key): | |
| self[key] = self.factory_func(key) | |
| return self.factory_func(key) |
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