Added save and load functionality to shopping list.

shopping_list = []

def show_help():
    #print instructions
    print ("Welcome to UrList, please enter your food shopping list")
    print ("""
Enter 'DONE' to stop adding items.
Enter 'HELP' to show welcome message.
Enter 'SHOW' to see your current list.
Enter 'SAVE' to save your shopping list.
ENTER 'LOAD' to load a saved list.""")


def show_list():
  #print the list
  print ("Here's your shopping list: ")

  for item in shopping_list:
    print(item)

def append_to_list(new_item):
  # add new items to list
  shopping_list.append(new_item)
  print("Added {} List now has {} items.".format(new_item, len(shopping_list)))

def save(shopping_list):
  with open("saved_list.txt", 'w') as file_handler:
    for item in shopping_list:
        file_handler.write("{}\n".format(item))
    print("Shopping list saved")

def load():
  with open('saved_list.txt') as f:
    for line in f:
        shopping_list.append(line)

def main():
  show_help()

  while True:
    new_item = input(">  ")

    if new_item == 'DONE':
      break
    elif new_item == 'HELP':
      show_help()
      continue
    elif new_item == 'SHOW':
      show_list()
      continue
    elif new_item == 'SAVE':
      save(shopping_list)
      continue
    elif new_item == 'LOAD':
      load()
      continue
    append_to_list(new_item)
  show_list()  
main()