Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Introducing Lists Build an Application Display the List

Angelus Miculek
Angelus Miculek
6,228 Points
Posted by Angelus Miculek
Angelus Miculek
6,228 Points

this didn't work, sadly

I tried to do this:

def show_list():
    list_items = ", ".join(shopping_list.copy)
    print('Shopping List: {}'.format(list_items))

before seeing the solution, which was this:

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

,but my solution created a type error. What happened?

2 Answers

Steven Parker
Steven Parker
231,264 Points
Steven Parker
Steven Parker
231,264 Points

To call a method, you need to put parentheses (with optional arguments) after the method name. Without them you're referring to the method itself instead of the results of calling it.

    list_items = ", ".join(shopping_list.copy())
#                                            ^^ add these
Angelus Miculek
Angelus Miculek
6,228 Points
Angelus Miculek
Angelus Miculek
6,228 Points

ah! A syntax error -- I should know better. Thanks, Steven.