Greetings, If I have: class contrived_collection: def __init__(self): self.item = [{1,2},{3,4},{5,6}] a = contrived_collection() b = a.item[2] How can I ask b what it is a member of? I need to somehow know later in processing that: 1. b is a member of a.item 2. a.item is a member of a Thanks, --jim