Instead of comparing integers: > x = 1 > y = x # does assignment make copies? > y += 1 > assert x == 1 > => succeeds, which implies that Python makes a copy when assigning
with lists: > x = [1] > y = x # does assignment make copies? > y += [1] > assert x == [1] > => fails, which implies that Python uses references when assigning Compare lists with tupels: x = (1,) y = x # does assignment make copies? y += (1,) assert x == (1,) => succeeds, which implies *what*? Regards, Peter -- http://mail.python.org/mailman/listinfo/python-list
