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20 lines
600 B
Python
20 lines
600 B
Python
"""
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structures.py - PyLink data structures module.
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This module contains custom data structures that may be useful in various situations.
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"""
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import collections
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class KeyedDefaultdict(collections.defaultdict):
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"""
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Subclass of defaultdict allowing the key to be passed to the default factory.
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"""
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def __missing__(self, key):
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if self.default_factory is None:
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# If there is no default factory, just let defaultdict handle it
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super().__missing__(self, key)
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else:
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value = self[key] = self.default_factory(key)
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return value
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