def iter_tag_users(self, tag_id, first_user_id=None):
while True:<EOL><INDENT>follower_data = self.get_tag_users(tag_id, first_user_id)<EOL>if '<STR_LIT:data>' not in follower_data:<EOL><INDENT>return<EOL><DEDENT>for openid in follower_data['<STR_LIT:data>']['<STR_LIT>']:<EOL><INDENT>yield openid<EOL><DEDENT>first_user_id = follower_data.get('<STR_LIT>')<EOL>if not first_user_id:<EOL><INDENT>return<EOL><DEDENT><DEDENT>
获取标签下粉丝openid列表

:return: 返回一个迭代器，可以用for进行循环，得到openid

使用示例::

    from wechatpy import WeChatClient

    client = WeChatClient('appid', 'secret')
    for openid in client.tag.iter_tag_users(0):
        print(openid)