Sure. You can use the Python rjust() method. It pads it with spaces though, so use it carefully.
x = !Township_R!
x.rjust(width[, fillchar])
width = total string length after padding (be mindful of your field length)
fillchar (optional) = filler character, default is a space (leave this out if you want space)
So if a record in Township_R is [ABC] then running this with a width of 5 (x.rjust(5)) will create [ ABC].