Looking for feedback on code written for 'Extra Credit'

Good job! After running the code, I can see it working properly. The next steps would be to eliminate unnecessary print statements and add stronger checking of reasonable input values. Much of user input programming revolves around sanitizing input values and bulletproofing the code against erroneous values. Specific comments follow:

• when scanning to confirm an item is in the current list, it prints out 'Specified item is not in the list.' for every non-matching item. An alternative mechanism is to check for non-existence before the loop:

    if to_move not in shopping_list:
        print('Specified item is not in the list')
        return

    # Or you could simply try to remove it
    try:
        shopping_list.remove(to_move)
    except ValueError:
        print('Specified item is not in the list')
        return

    # Additional code hints:
    # if needed, you can quickly find the position of something you know is present
    index = shopping_list.index(to_move)

Other comments:

• after confirming item is in list, the number entered to confirm move target isn't verified, making the original MOVE target irrelevant. I typed in "a,b,c,d,e", "MOVE", "c", then confirmed with 4 and 2 to get "a,d,b,c,e"
• If a negative number is entered the add and MOVE functions behave unusually. "-1" inverts the list order on add.
• a non-number raises an unhandled exception.
• if the first move index given is greater than list length, an "index out of range" error is raised.
• The code doesn't check if an item is already on the list. This is OK for now, but if using remove() it will remove the first encountered match which might not be the actual target.
• The "-1" is needed because the user is working in positive integers (1, 2, 3, ...) while the list indexes use 0-based counting (0, 1, 2, ...)

Good luck on the other Extra Credit parts. Keep Going!