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1# Copyright (c) 2010-2024 openpyxl
3from collections import defaultdict
6class BoundDictionary(defaultdict):
7 """
8 A default dictionary where elements are tightly coupled.
10 The factory method is responsible for binding the parent object to the child.
12 If a reference attribute is assigned then child objects will have the key assigned to this.
14 Otherwise it's just a defaultdict.
15 """
17 def __init__(self, reference=None, *args, **kw):
18 self.reference = reference
19 super().__init__(*args, **kw)
22 def __getitem__(self, key):
23 value = super().__getitem__(key)
24 if self.reference is not None:
25 setattr(value, self.reference, key)
26 return value