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

Computer Science Introduction to Data Structures Building a Linked List Adding Nodes to a Linked List

Posted by JASON LEE
JASON LEE
17,352 Points

Problem with .size() method

@2:05 of the video, when using the .size() method I get the following error.

TypeError: LinkedList.size() missing 1 required positional argument: 'self'

So I put the variable name in l.size(l) and it works, but that doesn't seem right. Is no one else having this issue? Tried both in VS code editor and in the workspace version.

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

"LinkedList" is the name of the class, but size is an instance method. So you need to call it on an instance of the class instead of the class itself:

MyList = LinkedList()    # create an instance of the class
MyList.size()            # now you can call "size" on it