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21 lines
580 B
Python
21 lines
580 B
Python
class defaultdict(dict):
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def __new__(cls, *args, **kwargs):
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if len(args) >= 1:
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default_factory = args[0]
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args = args[1:]
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else:
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default_factory = None
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self = dict.__new__(cls, *args, **kwargs)
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self.default_factory = default_factory
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return self
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def __missing__(self, key):
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if self.default_factory:
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return self.default_factory()
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else:
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raise KeyError(key)
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def __repr__(self):
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return f"defaultdict({self.default_factory}, {dict.__repr__(self)})"
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