13.04.21 15:47, Peter Otten пише: > As to the | operator, maybe it could be added to Mapping?
The | operator returns a new instance, but constructor is not a part of the Mapping interface. You cannot make a general implementation, and making __or__ an abstract method will break all existing Mapping interface implementations which do not have the __or__ method. -- https://mail.python.org/mailman/listinfo/python-list
