Hi, I would like to create a collections.UserList subclass that can notify others when the list is mutated. I'm not sure which methods I need to override. I have checked the sources, and it seems difficult to figure out which methods needs to be overriden. For example, MutableSequence.extend is just a for loop that calls append(). Also, the clear() method just calls pop() until the sequence becomes empty. But UserList overrides extend, so if I ever want to know when the list is modified, I need to override extend() too. There are lots of base classes (UserList, MutableSequence, Sequence ) etc and some mutating methods might be inherited from those. I'll also have to do this for UserDict (which is a MutableMapping, which is a Mapping).
Is there a way to easily find out which methods of are mutating the collection? Other than going over the source and checking all (normal and inherited) methods? And finally: set is a built in container type, but we don't have a UserSet in collections. Was it ever proposed to be added to collections? Thanks, Laszlo -- https://mail.python.org/mailman/listinfo/python-list
