modifying a list in an expression

[Skaperen]

that's also going to be slow. the code i gave is actually going to be in a loop affecting many units of data (each unit can be converted to a list). most units are strings and conversion to a list was a workaround because they are immutable. i guess squeezing this to a big expression in one line is just not going to happen.

and, yeah, it is harder to read. so i guess it's back to separate steps.