Understanding dictionary and lambda

Question

I need help understanding this piece of code, it's returning the most and less repeated element in a list, if there are elements that are repeated the same amount of times it returns the key which is greater

the #! Is code I've added I've tried it and it works apparently it's finding the less repeated element.

I explain which parts I'm unable to understand inside the code
https://code.sololearn.com/cA120A39a0A4/?ref=app

Answer 1

You can sort by default criteria or by own criteria.
In first case you don't need lambda.

In second case u need a lambda to describe how to sort.

Answer 2

Play around with the code and see what happens if u change the lambda.

Answer 3

I think I finally got it the lambda is using - sings to invert the order of the list of tuples, so that we can later return the first index, but it still seems like I'm just able to see a part of what the code is doing, I'll just keep looking into it :D