Error message:

Exception ignored in: <function BufferedFile.__del__ at 0x1104b7d30>
Traceback (most recent call last):
  File "/Users/jerrylin/.conda/envs/pythonProject/lib/python3.8/site-packages/paramiko/file.py", line 66, in __del__
  File "/Users/jerrylin/.conda/envs/pythonProject/lib/python3.8/site-packages/paramiko/channel.py", line 1392, in close
  File "/Users/jerrylin/.conda/envs/pythonProject/lib/python3.8/site-packages/paramiko/channel.py", line 991, in shutdown_write
  File "/Users/jerrylin/.conda/envs/pythonProject/lib/python3.8/site-packages/paramiko/channel.py", line 967, in shutdown
  File "/Users/jerrylin/.conda/envs/pythonProject/lib/python3.8/site-packages/paramiko/transport.py", line 1846, in _send_user_message
AttributeError: 'NoneType' object has no attribute 'time'

Program code:

import paramiko
import sys
import time
# Instantiate SSHClient
client = paramiko.SSHClient()

# Auto add policy to save server's host name and key information, if not added, then hosts no longer recorded in local know_hosts file will not be able to connect
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

# Connect to the SSH server and authenticate with username and password
client.connect()

# Open a Channel and execute commands
stdin, stdout, stderr = client.exec_command('ls data/data_target') # stdout is the correct output, stderr is the error output, and there is one variable with a value

# Print the execution result
print(stdout.read().decode('utf-8'))

# Close SSHClient

client.close()

Solution:

The reason for the error is that the output print conflicts with the close executed by the program. You only need to add a time before the close Sleep (1) is OK