the python utility 'reverse' is reversing in-place. if you need a new list of reversed items? In such case the original list should be copied (by the member utility 'copy') into the new list and the function 'revers' applied on the new list: a=[1,2,3,4,5] b=a.copy() 'b' and 'a' are different objects id(a) 80088808 id(b) 8526344 print(b) [ 1,2,3,4,5] b.reverse() print(b) [5, 4, 3, 2, 1]

As a veteran of israeli hi-tech (above 21 years) i say these rules seem very useful. i also started to formulate my own set of rules - philosophy for SW Engineers https://www.ramugedia.com/philosophy-for-sw-engineers