code: def write_warc(self, resources=None, dumpfile=None):
          
          # Load library late as we want to be able to run rest of code
          # without this installed
          try:
              from warc import WARCFile, WARCHeader, WARCRecord
          except:
              raise DumpError("Failed to load WARC library")
          wf = WARCFile(dumpfile, mode="w", compress=self.compress)
          # Add all files in the resources
          for resource in resources:
              wh = WARCHeader({})
              wh.url = resource.uri
              wh.ip_address = None
              wh.date = resource.lastmod
              wh.content_type = 'text/plain'
              wh.result_code = 200
              wh.checksum = 'aabbcc'
              wh.location = self.archive_path(resource.path)
              wf.write_record(WARCRecord(header=wh, payload=resource.path))
          wf.close()
          warcsize = os.path.getsize(dumpfile)
          self.logging.info(
              "Wrote WARC file dump %s with size %d bytes" %
              (dumpfile, warcsize))
docs: Write a WARC dump file.
  
          WARC support is not part of ResourceSync v1.0 (Z39.99 2014) but is left
          in this library for experimentation.