import paramiko
import time
try:
    sshd = paramiko.SSHClient()
    sshd.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    sshd.connect('127.0.0.1', port='20',
                 username='abcde', password='123456')
    stdin, stdout, stderr = sshd.exec_command('cat pwddd')
    time.sleep(1)
    out = stdout.read().decode('ascii').strip("\n")
    err = stderr.read().decode('ascii').strip("\n")
    print(out)
    if err is not None:
       raise Exception(err)
    sshd.close()
except Exception as e:
    print(e)
    exit()

import paramiko
from paramiko import SSHClient
from paramiko import AutoAddPolicy

try:
    sshd =  SSHClient()
    sshd.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    sshd.connect('127.0.0.1', port='22',username='abcde')
    channel = sshd.invoke_shell(width=3000)
    channel.send("docker pull centos\n")

    while True:
        buf = channel.recv(1024)
        print(buf)
        if len(buf) == 0:
            break
        
    sshd.close()
except Exception as e:
    print(e)
    exit()