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Python Python Basics (2015) Shopping List App Refactor

Posted by Terry Lowery
Terry Lowery
Courses Plus Student 1,367 Points

I am having problems with a code challenge moving things into the main function.

I verified through an editor that the code indenting was correct but it still is not validating.

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)

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

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

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The quickest way to complete the challenge is to highlight lines 22 through 43, indent 4-spaces using Ctrl-] twice, then add the line def main(): above line 22.

Manually indenting all the lines is hard to get correct within the challenge. The final code should look like:

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)
Terry Lowery
Terry Lowery
Courses Plus Student 1,367 Points

Thanks Chris, Do you know a way to indent in chrome on mac? I got this to work on my Windows VM.

Terry

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

On a Mac the equivalent is likely Command-] or ⌘-] to indented and Command-[ or ⌘-[ to unindent. In general, Command/⌘ is the same as Ctrl on PC.

Terry Lowery
PLUS
Terry Lowery
Courses Plus Student 1,367 Points
Terry Lowery
Terry Lowery
Courses Plus Student 1,367 Points

Thanks Chris, I thought I tried that but I guess I didn't hit that one. :)