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Message: [QUOTE="Ben, post: 2051551"] Ah - ok. In fact I simply had: class record: my_list =[] mops=[] def __init__(self,mops): self.mops=mops Where mops is something I pass in when i create the instance. I had thought that then each time I created an instance of the record class as an element of my dictionary: self.mop_list[record_number]=record(self.mops[:]) I would create a brand new instance of the record class.It would have a mops list initialized with mops (because the def__init__ constructor is called when the class is instantiated), and an empty, individual list my_list. I could then access each individual list by doing: self.mop_list[x].my_list[y]=something But in fact the same my_list is being accessed for all values of x, so a change to one list is in fact a change to them all. I think you might be right, but can't quite work it out myself! I'll keep trying :-) Thanks for your help, Ben [/QUOTE]