Ok, thanks Steven and Andre for yours reply. This is my situation: I've a list of objects of differents classes, with a common attribute name Something like this:
class Object1: obj1_name .... other fields date class Object2: obj2_name .... other fields date ... class ObjectN: objN_name .... other fields date the lists are created dynamically at runtime, depending or not if there one or more correspondig Objects, ex. list_object1 = [object1_1, object1_2 ... object1_n] ... list_objectN = [object2_1, object2_2 ... object2_n] Then i need to include all into one global list sorting the various objects by date ex global_list = [object1_1, object2_n, object1_2 ... etc] I think that Andre solution it's the best way to solve my dynamics lists problem, now I'll verify how to create the global list and sort it -- http://mail.python.org/mailman/listinfo/python-list