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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(resource_root, service_name, name, cluster_name="default"):
 """ Lookup a role by name @param resource_root: The root Resource object. @param service_name: Service name @param name: Role name @param cluster_name: Cluster name @return: An ApiRole object """

  return _get_role(resource_root, _get_role_path(cluster_name, service_name, name))