Benjamin Peterson wrote:
IIRC this was because UserDict tries to be a MutableMapping but abcs require new style classes.
Are there any use cases for UserList and UserDict in new code, now that list and dict can be subclassed? If not, I don't think it would be a big problem if they were left out of the ABC ecosystem. No worse than what happens to any other existing user-defined class that predates ABCs -- if people want them to inherit from ABCs, they have to update their code. In this case, the update would consist of changing subclasses to inherit from list or dict instead. -- Greg _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
