If you run into trouble please ask for help.
In addion to @jimtng’s link, Design Pattern: Working with Groups in Rules includes compatable examples in most of the rules languages for ways of looping through, filtering, map/reduce, for lists which is a very common thing one needs to do in rules. Python with it’s list comprehension syntax is a bit different from most languages but there are equivalents in all the languages and they usually don’t require for loops.