Mysql 如何使用sqlalchemy获得从属延迟？

有没有办法使用sql炼金术获得当前的从属延迟？session.execute（'show slave status'）似乎不返回任何行：

In [0]: list(session.execute('show slave status'))

ResourceClosedError: This result object does not return rows. It has been closed automatically.

from sqlalchemy import create_engine

engine = create_engine('mysql+pymysql://username:password@your.hostname.com/')
connection = engine.connect()
result = connection.execute("SHOW SLAVE STATUS") 
for row in result:
   for k in row.keys():
     print k, ' >>> ', row[k]