Olaf | Overly Lightweight Acoustic Fingerprinting | Audio Utils library

I'm fetching data from different sources and the output string looks like the following:

If I am enter following command:

Right off the bat, I'm a beginner, so the issue may seem rudimentary.

Whenever I use "extends" and attempt to compile, I get an error message such like this one:

I get listA from the database. I get listB from a file that the end user uploads, which I convert to the right class in a list. For the example I give you a list that came from the database and one that the user uploaded. You can find samples of these below.

I need to check if listB is in listA, but when I use Except I get the entire list because Id isn't in listB (auto numeration in database). I have a solution for now, but is there a better way to do this?

I have the following input :

I have the following input :

I am trying to sort a complex object based off of a specific key placement. That key is usually either a numerical values 1, 2, 3, etc. It can also indicate a tie by having 1T, 2T, 3T, etc. But, if a team did not finish or was disqualified, their placement will be marked as DQ or DNF. I want any team with placement == DQ || placement == DNF to be sorted at the end of the list.

The object looks like this:

I need to capture the data for every line that has an "*" in position 7 between IDENTIFICATION DIVISION and ENVIRONMENT DIVISION. All other data can be ignored and once I hit Environment division I can exit the file.

IDENTIFICATION DIVISION and ENVIRONMENT DIVISION both start in position 8.

Here is an example of my DATA

i have a dataframe of video game titles that were released across multiple platforms, along with their total sales. it looks like this: