code: def forward_feed(self, amount):
          '''Calling this function finishes input of the current line, then moves the vertical 
          print position forward by x/300 inch.
          
          Args:
              amount: how far foward you want the position moved. Actual movement is calculated as 
              amount/300 inches.
          Returns:
              None
          Raises:
              RuntimeError: Invalid foward feed.
          '''
          if amount <= 255 and amount >=0:
              self.send(chr(27)+'J'+chr(amount))
          else:
              raise RuntimeError('Invalid foward feed, must be less than 255 and >= 0'f forward_feed(self, amount):
          '''Calling this function finishes input of the current line, then moves the vertical 
          print position forward by x/300 inch.
          
          Args:
              amount: how far foward you want the position moved. Actual movement is calculated as 
              amount/300 inches.
          Returns:
              None
          Raises:
              RuntimeError: Invalid foward feed.
          '''
          if amount <= 255 and amount >=0:
              self.send(chr(27)+'J'+chr(amount))
          else:
              raise RuntimeError('Invalid foward feed, must be less than 255 and >= 0')
docs: Calling this function finishes input of the current line, then moves the vertical 
          print position forward by x/300 inch.
          
          Args:
              amount: how far foward you want the position moved. Actual movement is calculated as 
              amount/300 inches.
          Returns:
              None
          Raises:
              RuntimeError: Invalid foward feed.