Here is the 'del' function implemented into shopping_list_3. Do let me know if this helps you. thanks

import sys
shopping_list = []
multiple_items = []
print("""Would you like to start your supreme AI shopping experience?\n Y/n""")
command = input('>')
def show_help():
    print('\nSeperate each item with a comma.')
    print('\nType DONE to quit, SHOW to see the current list, DELETE to see the delete menu and HELP to get this message')
    add_item()
def show_list():
    count = 1
    for item in shopping_list:
        print('{}: {}'.format(count, item))
        count+=1
    print("Continue adding items? Y/n")
    continue_adding = input('>')
    if continue_adding == "Y".lower():    
        add_item()
    else:
        print("Good bye!")
def delete_item():
    print("Please type the index number of the item you would like to delete")
    print("For example to delete '{}' type {}".format(shopping_list[0], '1'))
    count = 1
    for item in shopping_list:
        print('{}: {}'.format(count, item))
        count+=1
    delete = input('>')
    del shopping_list[int(delete)-1]
    add_item()
def add_item():
    print('\nPlease enter the name of the item or enter a COMMAND\nType HELP to see the available commands\nIf more than one item, Seperate each item with a comma: \n')
    command = input('>')
    if command != "DONE".lower() and command != "SHOW".lower() and command != "HELP".lower() and command != "DELETE".lower():

        print("Add this to certain spot on the list?, "
                "\ncurrently we are on number {}\nPRESS ENTER for last spot and continue or give me a NUMBER. NO LETTERS or "   "SYMBOLS:\n".format(len(shopping_list)+1))
        index = input('>')
        new_list = command.split(",")
        if index:
            spot = int(index) - 1
            for item in new_list:
                shopping_list.insert(spot, item.strip())
                spot+=1
        else:    
            for item in new_list:
                shopping_list.append(item.strip())

        add_item()
    else:
        function_dict[command]()

def exit():
    print("""Thank for shopping with us.
I know it's a bit late but we dont really sell anything...\nThe shopping list looks neat though!\nOk bye now""")
    sys.exit()    

function_dict = {"Y".lower():add_item, "HELP".lower():show_help, "SHOW".lower():show_list, "DELETE".lower():delete_item, "DONE".lower():exit}
function_dict[command]()