code: def get_route53_client(agent, region, cooperator=None):
      
      if cooperator is None:
          cooperator = task
      return region.get_client(
          _Route53Client,
          agent=agent,
          creds=region.creds,
          region=REGION_US_EAST_1,
          endpoint=AWSServiceEndpoint(_OTHER_ENDPOINT),
          cooperator=cooperator,
      )
docs: Get a non-registration Route53 client.