def _AppendTokenSubtype(node, subtype):
 pytree_utils.AppendNodeAnnotation(node, pytree_utils.Annotation.SUBTYPE, subtype)

def _AppendTokenSubtype ( node , subtype ) : pytree_utils . AppendNodeAnnotation ( node , pytree_utils . Annotation . SUBTYPE , subtype )
append the tokens subtype only if its not already set .