def service_region(self, service_name):
    """
    Args:
      service_name: the name of the service in the service registry
    Returns:
      the region the service is in, or EFConfig.DEFAULT_REGION if the region was not found
    """
    if not self.services()[service_name].has_key("region"):
      return EFConfig.DEFAULT_REGION
    else:
      return self.services()[service_name]["region"]
Args:
      service_name: the name of the service in the service registry
    Returns:
      the region the service is in, or EFConfig.DEFAULT_REGION if the region was not found