Raymond Hettinger added the comment: It's not a bug. Guido designed the Set ABC to use operators instead of the named methods. The += operator for the __ior__() method that provides much of the same functionality.
In your concrete class, you can add an update() method easily: class MySet(Set): update = Set.__ior__() Mutable mapping has an update() method because it is an essential part of the mapping API and because there is no operator equivalent as there is for the set API. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22089> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com