Shopping list take 3- lines separating my list...

import os

shopping_list = []


def clear_screen():
  os.system("cls" if os.name == "nt" else "clear")


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

def add_to_list(item):
  show_list()
  if len(shopping_list):
    position = input("Where should I add {}?\n"
                     "Press ENTER to add to the end of the list\n"
                     "> ".format(item))
  else:
    position = 0

  try:
    position = abs(int(position))
  except ValueError:
    position = None
  if position is not None:
    shopping_list.insert(position-1, item)
  else:
    shopping_list.append(new_item)

  show_list()


def show_list():
  clear_screen()

  print("Here's your list:")

  index = 1
  for item in shopping_list:
    print("{}. {}".format(index, item))
    index += 1

    print("_"*10)

show_help()

while True:
  new_item = input("> ")

  if new_item.upper()  == 'DONE' or new_item.upper() == 'QUIT':
    break
  elif new_item.upper() == 'HELP':
    show_help()
    continue
  elif new_item.upper() == 'SHOW':
    show_list()
  else:
    add_to_list(new_item)

show_list()