import paramiko
ssh = paramiko.SSHClient()    #创建ssh对象
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy)   #当找不到验证时自动添加
ssh.connect(hostname='192.168.1.104',port=22,username='songsa',password='123456')   #连接服务器
data = input('>>>')
std_in,std_out,std_err = ssh.exec_command(data)   #执行命令
out,err = std_out.read(),std_err.read()
result = out if out else err  #如果执行正确 result= stdout.read(),否则 result= stderr.read()
print(result.decode())

import paramiko
transport = paramiko.Transport(('192.168.1.104',22))   #创建实例
transport.connect(username='root',password='123456')  #建立连接
sftp = paramiko.SFTPClient.from_transport(transport)  #将创建的实例当作参数传给paramiko.SFTPClient.from_transport，交互实在这里边进行的
sftp.put(r'C:\Users\songsa\Desktop\python.tgz','/home/songsa/python_test/python.tgz') #上传
sftp.get('/home/songsa/python_test/python.tgz',r'C:\Users\songsa\Desktop\python.tgz') #下载
transport.close()

import paramiko
private_key = paramiko.RSAKey.from_private_key_file(r'C:\Users\songsa\PycharmProjects\untitled\3.21\id_rsa')
ssh = paramiko.SSHClient()  #创建SSH对象
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy) #允许连接不在know_hosts文件中的主机
ssh.connect(hostname='192.168.1.104',port=22,username='songsa',pkey=private_key)#连接服务器
stdin,stdout,stderr =  ssh.exec_command('pwd') #执行命令
result = stdout.read()
print(result.decode())
ssh.close()

import paramiko
private_key = paramiko.RSAKey.from_private_key_file(r'C:\Users\songsa\PycharmProjects\untitled\3.21\id_rsa')
transport = paramiko.Transport(('172.20.0.158', 22))
transport.connect(username='songsa', pkey=private_key)
sftp = paramiko.SFTPClient.from_transport(transport)
sftp.get('/home/songsa/.ssh/id_rsa','id_rsa.txt')
transport.close()