# openpyxl.utils.bound_dictionary module

class openpyxl.utils.bound_dictionary.BoundDictionary(reference=None, *args, **kw)

  Bases: `defaultdict`

  A default dictionary where elements are tightly coupled.

  The factory method is responsible for binding the parent object to the child.

  If a reference attribute is assigned then child objects will have the key assigned to this.

  Otherwise it’s just a defaultdict.