Dictionary/List Homework

[nilamo]

Spin up the debugger, and see what title_list is, to try to find the issue.

python -m pdb myfile.py
-> # first line of program
(Pdb) 

Then type next (or just "n") to step through the code until you get to the line that's throwing an error. Once there, type interact, and then print(title_list).

If I were to take a guess, though, it's that title_list is a list of lists, which doesn't make sense to try to make a set out of. Remember, you just changed the structure of your data, so you'll probably need to change some of the code that parses that structure so it'll work with the new structure.