Paramiko ssh-agent

Question

检查ssh-agent是否加载，我把条件

          """ Check if ssh-agent is working and are forwarding keys to mgmt host #ssh-add -L """
         agent = paramiko.Agent()
         agent_keys = agent.get_keys()
         if agent_keys:
             pass
         else:
             print " ssh-agent is not working for your id , please fix the same and  run ssh-add -L to check if your public key is getting forwarded by ssh-agent "

它运行正常，但是用sudo运行它不起作用，我想知道如何获取用户的ssh-agent，即使它是由sudo运行的。