python之自动登录Telnet并执行command

code：

#!/usr/bin/python

import telnetlib
import sys
import time
import logging

class TelnetClient():
    def __int__(self,):
        self.tn = telnetlib.Telnet()

    def login_host(self, host_ip, user_name, pass_word):
        try:
           # self.tn.open(host_ip, port=23)
            self.tn = telnetlib.Telnet(host_ip,port=23)
        except:
            logging.warning("failed to connect to host:%s" %host_ip)
            return False
        self.tn.read_until(b'login:', timeout=10)
        self.tn.write(user_name.encode('ascii') + b'\n')

        self.tn.read_until(b'password:', timeout=10)
        self.tn.write(pass_word.encode('ascii') + b'\n')

        time.sleep(2)

        command_result = self.tn.read_very_eager().decode('ascii')
        if "incorrect" not in command_result:
            logging.warning("login to host:%s successfully" %host_ip)
            return True
        else:
            logging.warning("login to host:%s failed" %host_ip)
            return False

    def inputCommand(self, command):
        print("%s" %command)
        self.tn.write(b"command\n")
        # must wait for the end of the command
        time.sleep(2)
        command_result = self.tn.read_very_eager()
        #logging.debug("%s" %command_result)
        print command_result

    def logout(self):
        self.tn.write(b"logout\n")

if __name__ == '__main__':
    host_ip = sys.argv[1]
    pass_word = '      '
    user_name = 'admin'
    complete = '>#'
    telnet_client = TelnetClient()
    print("we are try to telnet to %s" %(host_ip))
   # login to the host, success:return true, fail: return false
    if telnet_client.login_host(host_ip, user_name, pass_word):
        telnet_client.inputCommand('command')
        telnet_client.logout()

解释略。。