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Message: [QUOTE="Erik Johnson, post: 2051554"] Similar to the example I gave, the lists my_list and mops shown above are executed just once: when your class definition is first parsed. The statement: def __init__(self,mops): is also executed just once, and the value for mops at that time is the value assigned to object attributes during object construction - a reference to record.mops, in your case. So, there are really only two lists here, class attributes record.my_list and record.mops. Each of your constructed objects is assigned a reference to record.mops. They all share that list. If you want a record object to have it's own list, give it a new, empty one and then populate it appropriately. [/QUOTE]