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Message: [QUOTE="Erik Johnson, post: 2051545"] Well, it's a little bit difficult, but I think I actually know what's going on. You probably need some code that looks something like this, to ensure each object has it's own, independent list: class record: def __init__(self, init_list=None): self.my_list = [] if init_list is not None: self.my_list.extend(init_list) Here's what I think you are doing, and below should make it clear why that doesn't work: class record: def __init__(self, init_list=[]): That list above, the default initializer is constructed just once (when the def statement executes)! .... def __init__(self, init_list=[]): .... self.my_list = init_list .... [/QUOTE]