问如何用python永久启动ssh-agent？

EN

ssh_agent_setup.setup()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/ssh_agent_setup/__init__.py", line 34, in setup
    _setupAgent()
  File "/usr/local/lib/python3.6/site-packages/ssh_agent_setup/__init__.py", line 18, in _setupAgent
    raise Exception( 'Could not parse ssh-agent output. It was: {}'.format( process.stdout ) )
Exception: Could not parse ssh-agent output. It was: setenv SSH_AUTH_SOCK /tmp/ssh-thoTQTiOTR0y/agent.47524;
setenv SSH_AGENT_PID 47797;
echo Agent pid 47797;