Prefer islice instead of list(...)[slice]

preferISlice.ql

/**
 * @name Use islice() to slice an iterable.
 * @description instead of converting an iterable to a list and then slicing it
	use `islice` for efficiency.
 * @kind problem
 * @tags maintainability
 * @problem.severity recommendation
 * @sub-severity low
 * @precision high
 * @tags speed
 * @sub-severity low
 * @id py/use-islice
 */
import python


from Subscript subs
where
	subs.getValue().(Call).getFunc().pointsTo(Value::named("list")) and
	subs.getIndex() instanceof Slice
select subs, "Use `islice` instead."