Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Basics (2015) Shopping List App Refactor

Christopher Parke
Christopher Parke
21,978 Points

create a new function called main

Dont get what's wrong here.

shopping_list.py
def show_help():
    # print out instructions on how to use the app
    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 show_list(shopping_list):
    # print out the list
    print("Here's your list:")

    for item in shopping_list:
        print(item)

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


def main():
  show_help()

  # make a list to hold onto our items
  shopping_list = []

  while True:
    # ask for new items
     new_item = input("> ")

    # be able to quit the app
      if new_item == 'DONE':
         break
      elif new_item == 'HELP':
         show_help()
          continue
      elif new_item == 'SHOW':
          show_list(shopping_list)
          continue
      add_to_list(shopping_list, new_item)
      show_list(shopping_list)

2 Answers

Steven Parker
Steven Parker
215,984 Points

It looks like you moved that last line into the loop. It should be inside the function, but not indented so much as to be inside the loop.

Christopher Parke
Christopher Parke
21,978 Points

How does python know when my function is over? Feels weird without curly braces in the language.

Steven Parker
Steven Parker
215,984 Points

As you know, python relies on indentation.

:point_right: It knows your function has ended when it encounters a line that is is not indented, or the end of file.