[split] question about list comprehension

[Armin]

Thanks a lot for helping me understand this but now if I enter say 10 in this case the string it will be .split () will be output to '1' and '0' as then in the following line I assign y the value of 10 variables di then inside the formula I get result 6? I apologize in advance if I'm bored, but I've been messing with this code all day and can't handle it completely.
Thank you all very much