old_contents: class Rover:
  
      compass = ['N', 'E', 'S', 'W']
  
      def __init__(self, x=0, y=0, direction='N'):
          self.x = x
          self.y = y
          self.direction = direction
  
      @property
      def position(self):
          return self.x, self.y, self.direction
  
      @property
      def compass_index(self):
          return next(i for i in range(0, len(self.compass)) if self.compass[i] == self.direction)
  
  
      @property
      def axis(self):
          # 0 if pointing along x axis
          # 1 if pointing along y axis
          return (self.compass_index + 1) % 2
  
      def set_position(self, x=self.x, y=self.y, direction=self.direction):
          self.x = x
          self.y = y
          self.direction = direction
  
      def move(*args):
          for command in args:
              if command == 'F':
                  # Move forward command
                  pass
              else:
                  pass
  
new_contents: class Rover:
  
      compass = ['N', 'E', 'S', 'W']
  
      def __init__(self, x=0, y=0, direction='N'):
          self.x = x
          self.y = y
          self.direction = direction
  
      @property
      def position(self):
          return self.x, self.y, self.direction
  
      @property
      def compass_index(self):
          return next(i for i in range(0, len(self.compass)) if self.compass[i] == self.direction)
  
  
      @property
      def axis(self):
          # 0 if pointing along x axis
          # 1 if pointing along y axis
          return (self.compass_index + 1) % 2
  
      def set_position(self, x=None, y=None, direction=None):
            if x is not None:
                self.x = x
  
            if y is not None:
                self.y = y
  
            if direction is not None:
                self.direction = direction
  
      def move(self, *args):
          for command in args:
              if command == 'F':
                  # Move forward command
                  if self.compass_index < 2:
                      # Upper right quadrant, increasing x/y
                      pass
              else:
                  pass
  
subject: Add default arguments to set_position, add self argument to move function