code: def width(self, add_quiet_zone=False):
          
          quiet_zone = self.quiet_zone if add_quiet_zone else 0
          return len(self.modules) + 2 * quiet_zone
docs: Return the barcodes width in modules for a given data and character set combination.
  
          :param add_quiet_zone: Whether quiet zone should be included in the width.
  
          :return: Width of barcode in modules, which for images translates to pixels.