The application - lists with Craig

print("Welcome to the shopping app\n" +
     "Here you will be able to write down your shopping list\n" +
     "for help: just write 'HELP'")

# Define a help function
def show_help():
    print("\n* To add an item just write what you want to add" +
         "\n* For help, just write HELP" +
         "\n* To show the shopping list, write: Show" +
         "\n* To remove an item from the list, write: Remove" +
         "\n* To finish writing your shopping list, write: Done" +
         "\n* To clear shopping list, write: Clear"
         )

# Define add to list function
def add_to_list(item):
    print(item.lower(), "added to the list")
    shopping_list.append(item)

# Define show list function
def show_list():
    noun_ending = "s"
    if len(shopping_list) < 2:
        noun_ending = ""
    print(f"\nYour shopping list cointains of {len(shopping_list)} item{noun_ending}\n")
    for idx, item in enumerate(shopping_list, 1):
        print(f"{idx}.", item.lower())

# Define remove function
def remove_from_list(item_to_remove):
    try:
        shopping_list.remove(item_to_remove.upper())
    except ValueError:
        try:
            item_to_remove = int(item_to_remove)
        except ValueError:
            print("Sorry, that item does not exist in your shopping list")
        else:
            if item_to_remove > 0 and item_to_remove <= len(shopping_list):
                print("You removed {} from the shopping list".format(shopping_list[item_to_remove - 1]))
                shopping_list.pop(item_to_remove - 1)
            else:
                print("Sorry, that item does not exist in your shopping list")
    else:
        print("You removed {} from the shopping list".format(item_to_remove))


shopping_list = []
loop_valid = True

while loop_valid:
    user_choice = input("\nWhat would you like to add to the list?  ").upper()
    try:
        user_choice = int(user_choice)
    except ValueError:
        if user_choice == "HELP":
            show_help()
        elif user_choice == "SHOW":
            if len(shopping_list) > 0:
                show_list()
            else:
                print("Your shopping list is currently empty")
        elif user_choice == "REMOVE":
            show_list()
            remove_item = input("\nTo remove an item, please specify index position or item by value:")
            remove_from_list(remove_item)
        elif user_choice == "DONE":
            print("This is your shopping list, happy shopping!")
            show_list()
            loop_valid = False
        elif user_choice == "CLEAR":
            shopping_list.clear()
            print("Your shopping list is now cleared")
        else:
            add_to_list(user_choice)