client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(
    hostname='192.168.40.111',
    port=22,
    username='root',
    password='yourpass'
)

stdin, stdout, stderr = client.exec_command('ssh 192.168.40.158 "df -h"', get_pty=True)

while not stdout.channel.exit_status_ready():

    temp = stdout.channel.recv(1024)

    result = temp.decode('utf-8').strip('\r\n')# 获取数据

    if "continue connecting" in result:        # 可能遇到询问是否添加指纹
        stdout.channel.send("yes\n")           # 自动推送yes

    if "password:" in result:                  # 可能遇到询问密码
        password_cmd = "%s\n" % yourpass       # 指定推送密码(第二台服务器的密码)
        stdout.channel.send(password_cmd)
    else:
        print(result)if stdout.channel.exit_status_ready():     # 这里需要单独再判断一次，否则读取的数据可能少一部分
        temp = stdout.channel.recv(1024)
        result = temp.decode('utf-8').strip('\r\n')  

        print(result)                          

        break