shopping_list = []

def show_help():
    print("What should we pick up at the store?")
    print("Enter DONE to stop. Enter HELP for this help. Enter SHOW to see your current list.")

def add_to_list(item):
    shopping_list.append(item)
    print("Added! List has {} items.".format(len(shopping_list)))

def show_list():
    print("Here's your list:")
    for item in shopping_list:
        print(item)

show_help()

while True:
    new_item = input("> ")
    if new_item == 'DONE':
        show_list();
        break:
    elif new_item == 'HELP':
        show_help()
        continue
    elif new_item == 'SHOW':
        show_list()
        continue
    add_to_list(new_item)
    continue

shopping_list = []

def show_help():
    print("What should we pick up at the store?")
    print("Enter DONE to stop. Enter HELP for this help. Enter SHOW to see your current list.")

def add_to_list(item):
    shopping_list.append(item)
    print("Added! List has {} items.".format(len(shopping_list)))

def show_list():
    print("Here's your list:")
    for item in shopping_list:
        print(item)

show_help()

while True:
    new_item = input("> ")
    if new_item == 'DONE':
        show_list();
        break
    elif new_item == 'HELP':
        show_help()
        continue
    elif new_item == 'SHOW':
        show_list()
        continue
    add_to_list(new_item)
    continue

Fix typo