Hi, i try to copy a sublist from list "a" to list "b". After that i alter a value in "b" and oops! value in "a" is also altered. so it looks like that: >>> a=[[1,2],[3,4]] >>> b=[] >>> b.append(a[0]) >>> b [[1, 2]] >>> b[0][0]=3 >>> a [[3, 2], [3, 4]] how can i copy a sublist without "get_a_value_from_a_list_and_put_it_into_another" Regards, Daniel