python list duplicating instead of concatenating -

class rating():     def __init__(self, user, item, rating):         self.user = user         self.item = item         self.rating = rating      def __str__(self):         return str(user) + " " + str(item) + " " + str(rating)      def __repr__(self):         return str(user) + " " + str(item) + " " + str(rating)   data = open('data.dat').readlines() records = ()  in data:     user, item, rating = i.split()     r = rating(user, item, rating)     records += (r,)     print records 

data = [a, b, c], i'd expect records have (<record> a, <record> b, <record> c). instead contains (<record> c, <record> c, <record> c)?

you not using class attributes, global variables have defined chance.

return str(user) + " " + str(item) + " " + str(rating) 

should like

return str(self.user) + " " + str(self.item) + " " + str(self.rating)