Python list slice steps in Ruby.

gistfile1.txt

class Array
  alias_method :brackets, :[]

  def [](*args)
    return brackets(*args) if args.length != 3
    start, stop, step = *args
    self.values_at(*(start...stop).step(step))
  end
end

arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]
arr[1,7,2]
#=> [2, 4, 6]