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Python Python Basics (2015) Shopping List App Shopping List Takeaways

Kyle Hille
Kyle Hille
720 Points
Posted by Kyle Hille
Kyle Hille
720 Points

shopping list deleting an item from the list, how to? Python

So there is a video that Kenneth Love teaches about creating a shopping list. I wanted to add onto it, just for my own learning sake and add the ability to delete an item from the list.

The problem is, that it never deletes it haha. I'm sure I have done something simple, or maybe I'm just crazy and wrong, but here is what I have : 

shopping_list = []

def show_help():
    print("What should we pick up at the store?")
    print("""
Enter 'DONE' to stop adding items.
Enter 'SHOW' to show your current list.
Enter 'DELE' to delete an item from the list.
Enter 'HELP' to get back to this message.
""")
def show_list():
    print("Here is your list :")
    for item in shopping_list:
        print(item)

def add_to_list(new_item):
    shopping_list.append(new_item)
    print("Added {}. List now has {} items.".format(new_item, len(shopping_list)))
#created a new function    
def delete_from_list():
#get input from user to figure out what they want to remove
    delete_me = input("Which item would you like to delete from the list? ")
#remove that item from the list
    shopping_list.remove(delete_me)
#written confirmation showing that item has been removed from the list
        print("{} has been removed from the list.".format(delete_me))

show_help()

while True:
    new_item = input("> ")

    if new_item == 'DONE':
        break
    elif new_item == 'DELE':
#shows the list, so you don't have to try to delete from memory
        show_list()
#run delete_from_list function
        delete_from_list()
        continue
    elif new_item == 'HELP':
        show_help()
        continue
    elif new_item == 'SHOW':
        show_list()
        continue
    add_to_list(new_item)

show_list()
Kyle Hille
Kyle Hille
720 Points
Kyle Hille
Kyle Hille
720 Points

And three minutes later, while waiting for an answer, I think to myself : It would be nice to know how many items you have left in your list after you remove one, so you don't have to type in another item, just to remove it again, or type SHOW to have a full count. So I copy pasted from the add_to_list function and now it works? I'm not really sure what caused this? I did not change anything from the elif == 'DONE' call.

def delete_from_list():
    delete_me = input("Which item would you like to delete from the list? ")
    shopping_list.remove(delete_me)
    print("{} has been removed from the list. You now have {}items".format(delete_me, len(shopping_list)))

1 Answer

Osher Jacobs
Osher Jacobs
2,226 Points

In answer to your first and second question: the code runs fine (as in the items get removed) if you change the indentation of the print command:

"print("{} has been removed from the list.".format(delete_me))"

to match the indentation of the list method call "shopping_list.remove(delete_me)"

In your modified code the indentation is the same. I think that was the issue.

Hope this helps.

Kyle Hille
Kyle Hille
720 Points
Kyle Hille
Kyle Hille
720 Points

Ah yes! I must have fixed that naturally when I was going back through and adding more. Cheers mate!