title: AttributeError: 'NoneType' object has no attribute 'time' paramiko
body: <pre><code>import paramiko
  
  key = paramiko.RSAKey.from_private_key_file("abc.pem")
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  print("connecting")
  ssh.connect(hostname="1.1.1.1", username="abc", pkey=key)
  print("connected")
  commands = "ip a"
  stdin, stdout, stderr = ssh.exec_command(commands)
  print(stdout.read())
  print(stderr.read())
  print(stdin.read())
  ssh.close()
  </code></pre>
  
  <p>Why have sometime will <code>AttributeError: 'NoneType' object has no attribute 'time'</code> in Python3.8 and sometime need wait long time show as result(or how can i see process)</p>
  
  <p>Error code:</p>
  
  <pre><code>Exception ignored in: &lt;function BufferedFile.__del__ at 0x108271ee0&gt;
  Traceback (most recent call last):
    File "/venv/lib/python3.8/site-packages/paramiko/file.py", line 66, in __del__
    File "/venv/lib/python3.8/site-packages/paramiko/channel.py", line 1392, in close
    File "/venv/lib/python3.8/site-packages/paramiko/channel.py", line 991, in shutdown_write
    File "/venv/lib/python3.8/site-packages/paramiko/channel.py", line 967, in shutdown
    File "/venv/lib/python3.8/site-packages/paramiko/transport.py", line 1846, in _send_user_message
  AttributeError: 'NoneType' object has no attribute 'time'
  </code></pre>
  
  <p>Advance</p>
  
  <p>how can i use paramiko double ssh</p>
  
  <p>localhost >> a(server) ssh >> b</p>