code: def from_config(cls, config):
          
          auth_key = None
          password_file = config["authentication.passwordFile"]
          if password_file is not None:
              try:
                  auth_key = open(config["authentication.passwordFile"]).read()
                  auth_key = re.sub(r"\s", "", auth_key)
              except IOError:
                  LOG.error("Could not load password file!")
                  sys.exit(1)
          password = config["authentication.password"]
          if password is not None:
              auth_key = password
          connector = Connector(
              mongo_address=config["mainAddress"],
              doc_managers=config["docManagers"],
              oplog_checkpoint=os.path.abspath(config["oplogFile"]),
              collection_dump=config["onlyDump"] or not config["noDump"],
              only_dump=config["onlyDump"],
              batch_size=config["batchSize"],
              continue_on_error=config["continueOnError"],
              auth_username=config["authentication.adminUsername"],
              auth_key=auth_key,
              fields=config["fields"],
              exclude_fields=config["exclude_fields"],
              ns_set=config["namespaces.include"],
              ex_ns_set=config["namespaces.exclude"],
              dest_mapping=config["namespaces.mapping"],
              namespace_options=config["namespaces.namespace_options"],
              gridfs_set=config["namespaces.gridfs"],
              ssl_certfile=config["ssl.sslCertfile"],
              ssl_keyfile=config["ssl.sslKeyfile"],
              ssl_ca_certs=config["ssl.sslCACerts"],
              ssl_cert_reqs=config["ssl.sslCertificatePolicy"],
              tz_aware=config["timezoneAware"],
          )
          return connector
docs: Create a new Connector instance from a Config object.