code: def _print_base64(self, base64_data):
          
  
          label_file = open(self.device, "w")
          label_file.write(base64_data)
          label_file.close()
docs: Pipe the binary directly to the label printer. Works under Linux
          without requiring PySerial. This is not typically something you
          should call directly, unless you have special needs.
          
          @type base64_data: L{str}
          @param base64_data: The base64 encoded string for the label to print.