TypeError in shopping_list 2 code

Question

Hi Everyone,

I am getting an error in the shopping list 2 code, although I've followed the video steps. Please make suggestions about what the error is about.

Here is the code:

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

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' to show these help lines. Enter 'SHOW' to show items added so far.""")

def show_list(): # print out the list print("Here's your list") for item in shopping_list: print(item)

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

show_help()

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()
    continue
add_to_list(new_item)        # Line 38!!!!!!!!!!!

show_list()

Here's the error message:
treehouse:~/workspace$ python shopping_list.py
What should we pick up at the store?

      Enter 'DONE' to stop adding items.                                                                
      Enter 'HELP' to show these help lines.                                                            
      Enter 'SHOW' to show items added so far.

cologne
Traceback (most recent call last):
File "shopping_list.py", line 38, in <module>
add_to_list(new_item)
TypeError: add_to_list() takes 0 positional arguments but 1 was given

Thanks for your help!!

Mohammad

Answer 1 · 2017-11-17T15:43:46Z

November 17, 2017 3:43pm

As the error message indicates, there's an argument mismatch between the definition and the call. You can resolve it 2 ways:

If you want to be able to pass the item as a parameter, alter your definition to include it:

def add_to_list(new_item):

Otherwise, if you'd like it to use the global variable instead you can change the way you call it, as Nicolas suggested:

    add_to_list()  # line 38

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Mohammad Aslam

Mohammad Aslam

TypeError in shopping_list 2 code

Nicolas Seglenieks

Nicolas Seglenieks

1 Answer

Steven Parker

Steven Parker