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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_role_config_group(resource_root, service_name, name, cluster_name="default"):
 """ Find a role config group by name. @param resource_root: The root Resource object. @param service_name: Service name. @param name: Role config group name. @param cluster_name: Cluster name. @return: An ApiRoleConfigGroup object. """

  return _get_role_config_group(resource_root, _get_role_config_group_path(
      cluster_name, service_name, name))