def _make_namespaced_xattr_key(key, namespace='user'):
 namespaced_key = '.'.join([namespace, key])
 return namespaced_key

def _make_namespaced_xattr_key ( key , namespace = 'user' ) : namespaced_key = '.' . join ( [ namespace , key ] ) return namespaced_key
create a fully-qualified xattr-key by including the intended namespace .