def __get_contents_in_body(self, body):
    for block in body.split('_BLOCK_LEVEL_TAG_'):
        (yield from self.__get_contents_in_block(block))
def __get_contents_in_body(self, body):
    for block in body.split('_BLOCK_LEVEL_TAG_'):
        (yield from self.__get_contents_in_block(block))