code: def page_format(self, topmargin, bottommargin):
          '''Specify settings for top and bottom margins. Physically printable area depends on media.
          
          Args:
              topmargin: the top margin, in dots. The top margin must be less than the bottom margin.
              bottommargin: the bottom margin, in dots. The bottom margin must be less than the top margin.
          Returns:
              None
          Raises:
              RuntimeError: Top margin must be less than the bottom margin.
          '''
          tL = topmargin%256
          tH = topmargin/256
          BL = bottommargin%256
          BH = topmargin/256
          if (tL+tH*256) < (BL + BH*256):
              self.send(chr(27)+'('+'c'+chr(4)+chr(0)+chr(tL)+chr(tH)+chr(BL)+chr(BH))
          else:
              raise RuntimeError('The top margin must be less than the bottom margin'f page_format(self, topmargin, bottommargin):
          '''Specify settings for top and bottom margins. Physically printable area depends on media.
          
          Args:
              topmargin: the top margin, in dots. The top margin must be less than the bottom margin.
              bottommargin: the bottom margin, in dots. The bottom margin must be less than the top margin.
          Returns:
              None
          Raises:
              RuntimeError: Top margin must be less than the bottom margin.
          '''
          tL = topmargin%256
          tH = topmargin/256
          BL = bottommargin%256
          BH = topmargin/256
          if (tL+tH*256) < (BL + BH*256):
              self.send(chr(27)+'('+'c'+chr(4)+chr(0)+chr(tL)+chr(tH)+chr(BL)+chr(BH))
          else:
              raise RuntimeError('The top margin must be less than the bottom margin')
docs: Specify settings for top and bottom margins. Physically printable area depends on media.
          
          Args:
              topmargin: the top margin, in dots. The top margin must be less than the bottom margin.
              bottommargin: the bottom margin, in dots. The bottom margin must be less than the top margin.
          Returns:
              None
          Raises:
              RuntimeError: Top margin must be less than the bottom margin.