depends on how fast it is supposed to be played, I try to avoid using my pinky though in fast plays I use it to overcome the distance between the frets

I'd play this piece by using the finger between my pinky and middlefinger (I don't know the name :p) for the 4's on both strings and play the 2's with my index finger, then the 5's with my index and the 7's with the same finger as the 4's, then switch to my index again for the 2's :) unless I gotta switch really fast between the 7's and the 2's then I use my pinky for the 7's

I'm curious how you play it