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Python Python Basics (2015) Shopping List App Refactor

Posted by Namrata Lamba
Namrata Lamba
1,347 Points

What's the error here?

Create a new function named main that doesn't take any arguments. Move everything from line 22 (show_help()) and below into your new function. You shouldn't have any code that isn't inside of a function.

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)

main()

1 Answer

Ari Misha
Ari Misha
19,323 Points
Ari Misha
Ari Misha
19,323 Points

Hiya Namrata! You've a few issues with your code. Instead of explaining all of 'em issues and bugs, i'll paste the code for your reference coz its just refactoring and nothing else. Here ya go:

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)