How Can I Resolve This Error

[JayJayOi]

The message indicates that python cannot compare a 'method' to a string with the comparison operator >. A method is a function. You get this because you forgot to call the method one.getData().getAuthor(). Note the parentheses.

The Error Seems To Have Been resolved With The Code. But there has not been any sorting being done on the contents of the linkedList.

This Is My Output

Output:
After Adding Value At Position 3
3
Author Name: DDD Title: CCC Book ID: 0003
Author Name: AAA Title: BBB Book ID: 0001
Author Name: GGG Title: FFF Book ID: 0004
Author Name: EEE Title: LLL Book ID: 0005
After Sorting
3
Author Name: DDD Title: CCC Book ID: 0003
Author Name: AAA Title: BBB Book ID: 0001
Author Name: GGG Title: FFF Book ID: 0004
Author Name: EEE Title: LLL Book ID: 0005

I am not sure if I have missed out anything inside the code for the BubbleSort().
Any Guidance Would Be Appreciated.
Thanks