python ssh 交互式命令行脚本，查找关键字，进行下一步命令操作。

import paramiko
import json
import time
from paramiko.ssh_exception import NoValidConnectionsError
from paramiko.ssh_exception import AuthenticationException


class SSHConnection():
    def __init__(self, hostname, port, username, password):
        self.hostname = hostname
        self.port = port
        self.username = username
        self.password = password
        try:
            self.connect()
        except (AuthenticationException, NoValidConnectionsError, TimeoutError) as e:
            print(e)

        stdin, stdout, stderr = self.ssh.exec_command('system identity pr')
        output = stdout.read().decode()
        self.identity = output.split(':')[1].strip()

    def connect(self):
        self.ssh = paramiko.SSHClient()
        self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        self.ssh.connect(hostname=self.hostname, port=self.port, username=self.username, password=self.password)

    def run(self, input):
        output = self.cmd(input)
        # self.close()
        return output


    def cmd(self, input):
        stdin, stdout, stderr = self.ssh.exec_command(input)
        output = stdout.read().decode()
        # prompt = '[%s@MikroTik] > %s\n' % (self.username, input)
        prompt = '[%s@%s] > %s\n' % (self.username, self.identity, input)
        print(prompt + output)
        return output


    def close(self):
        self.ssh.close()


if __name__ == '__main__':
    ssh = SSHConnection('192.168.64.201', 22, '路由器账号', '路由器密码')

    output = ssh.run('int pppoe-client pr')

    if output.find('R name="pppoe-out27"') >= 0:
        ssh.run('/ip pool set test ranges=1.1.1.27')

    ssh.close()