PersistentSet in ZODB 3
ZODB provides a PersistentList and a PersistentMapping, but I'd like a PersistentSet. I wrote a quick class that mirrors the ancient PersistentList from ZODB 2. Because there's no UserSet in Python, I had to extend from the C-based built-in set. class PersistentSet(UserSet, Persistent): def __iand__(self, other): set.__iand__(other...