How to change odd to even numbers in the list?

[plumberpy]

Are you not allowed to look at the individual values in the list? If not, why not?

If you are, then do you know how to use a for loop or comprehension? If not, look those things up.

Thanks.

Tried out a comprehension example. It works for strings but I cannot get it to do what I want with the numbers in the second layer in a list.

Cheerio.