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Message: [QUOTE="Ben, post: 2051533"] Hello... I have a dictionary, where each value is a seperate instance of the same class: self.mop_list[record_number]=record(self.mops[:]) In my case I know that record_number takes the values 0,3,and 7 thanks to a loop, giving me three instances of the record class instantiaterd with some data I've pased in. The record object contains a list, and each element of that list should also contain an instance of a class should I append one to it: self.mop_list[record_number].my_list.append(my_class(0,0,0,self.mop_list[record_no].mops,0)) So within each record class I have access to any number of my_class instances, depending on how many times I have appended: self.mop_list[record_number].my_list[index] This seems to work without any errors. But bizzarely I find that whatever my record number, the instance of "my_class" is appended to every list. So in this case self.mop_list[0].my_list.append(my_class(Some data for the constructor)) I would expect to append an instance of my_class to self.mop_list[0].my_list But annoyingly self.mop_list[0].my_list self.mop_list[3].my_list self.mop_list[7].my_list all have an instance of my_class created and appended to them. This is really confusing and quite annoying - I don't know whether anyone out there can make head or tail of what I'm doing wrong? Cheers, Ben [/QUOTE]