# Copyright (c) 2010-2024 openpyxl
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from collections import defaultdict
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class BoundDictionary(defaultdict):
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"""
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A default dictionary where elements are tightly coupled.
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The factory method is responsible for binding the parent object to the child.
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If a reference attribute is assigned then child objects will have the key assigned to this.
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Otherwise it's just a defaultdict.
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"""
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def __init__(self, reference=None, *args, **kw):
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self.reference = reference
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super().__init__(*args, **kw)
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def __getitem__(self, key):
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value = super().__getitem__(key)
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if self.reference is not None:
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setattr(value, self.reference, key)
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return value
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