def labels_from_header(header_name, header_value):
 if header_value:
  labels = parse_labels_string(header_name, header_value)
 else:
  labels = set()
 return labels

def labels_from_header ( header_name , header_value ) : if header_value : labels = parse_labels_string ( header_name , header_value ) else : labels = set ( ) return labels
helper that builds label set from the corresponding header value .