how can i use aiomysql connect to mysql cluster

```py3
db.client = await aiomysql.create_pool(host=str(host), port=int(port),
                                           user=str(user), password=str(passwd),
                                           db=str(mysql_db), loop=None, autocommit=False)
```

can i set host to a str ,such as "ip1,ip2"? 