Lol because I'm not good at this! This was probably written when I was learning

Powerful you are.
Anyway you are different then all other one-liners ))

why do it in one line when you can it in many?

seriously, appreciate man !! hah
but, use advantage of python :)

woah!

Take care you need to divide float and to round to 2 digits.
And should works normally

I see two errors I thing:

1. print ((v/len(seq))*100) your did not divid with float so v/len(seq) is == 0 for the sequence 'CA' insteed of 0.5
2. print ((v/len(seq))*100) you need to round to 2 decimal at the end.

let me know if you can get it.

@GiacomoSorbi Yeah, I know. I just had print there as i was testing. @nbeck, could you tell me what the issue might be?