12.04.21 19:01, Andreas R Maier пише: > Hi, > I have written some classes that represent immutable views on collections > (see "immutable-views" package on Pypi). > > Currently, these view classes inherit from the abstract collection classes > such as Mapping, Sequence, Set. However, they implement the read-only methods > of dict, list and set, which provides some more methods compared to the > abstract collection classes. For example, class "dict" provides copy() or > __reversed__() and the newer OR-operator methods all of which are not defined > on the abstract class "Mapping". > > Note that the view classes do not provide any of the modifying methods of > "dict" and "list", because after all the views are supposed to be immutable. > > My question is, should the dict view class inherit from Mapping or from dict, > and likewise, should the list view class inherit from Sequence or from list?
If it is a view, and represents a data stored in another object, it cannot be a subclass of concrete collection class. -- https://mail.python.org/mailman/listinfo/python-list
