Python 3，telnet 自动化

Question

我正在做一个项目，该项目是从多个交换机收集某些信息。请记住，我是 python 和编程新手。 我想做的是:拥有一个包含我的开关名称的 .txt 文件。
然后循环该列表，运行一些命令，并保存输出。

到目前为止，我有以下内容，可在单个开关上运行。正如您在评论中看到的，我试图打开我的 list.txt 并循环遍历它，但我的程序由于它位于列表中而无法工作(输出:['switchname-1'])我如何阅读我的列表.txt 并获取纯文本变量，例如。 switchname-1 没有所有列表字符？

import sys
import telnetlib
import time

password = "password"
command = "show interface status"

##with open ("list.txt", "r") as devicelist:
##    hostlist = []
##    hostlist=devicelist.readlines()
##    print(hostlist)
hostlist= [ ("switchname-1","",""),]

for host in hostlist:

        cmd1 = "enable"
        tn = telnetlib.Telnet(host[0])

        time.sleep(2)
        tn.read_until(b"Password: ")
        tn.write(password.encode('ascii') + b"\n")
        time.sleep(2)
        tn.write(cmd1.encode('ascii') + b"\n")
        time.sleep(2)
        tn.write(password.encode('ascii') + b"\n")
        time.sleep(2)
        tn.write(command.encode('ascii') + b"\n")
        time.sleep(2)
        tn.write(b"\n")
        time.sleep(2)
        tn.write(b"\n")
        time.sleep(2)
        tn.write(b"exit\n")
        lastpost = tn.read_all().decode('ascii')
        op=open ("output.txt", "w")
        op.write(lastpost)  
        print("writing to file")
        op.close()
        print(lastpost)
        tn.close()

我还试图弄清楚是否有某种方法可以只打印开关的最后一个输出，而不是 lastpost = tn.read_all().decode('ascii')发布整个 telnet session ？

Answer 1

工作代码:

import sys
import telnetlib
import time

password = "pw"
command = "sh ver"
term = "term len 0"

data = open("hostlist.txt")
for line in data:
    cmd1 = "enable"
    tn = telnetlib.Telnet(line.rstrip())
    tn.set_debuglevel(1)
    time.sleep(2)
    tn.read_until(b"Password: ")
    tn.write(password.encode('ascii') + b"\n")
    time.sleep(2)
    tn.write(cmd1.encode('ascii') + b"\n")
    time.sleep(2)
    tn.write(password.encode('ascii') + b"\n")
    time.sleep(2)
    tn.write(term.encode('ascii') + b"\n")
    tn.write(command.encode('ascii') + b"\n")
    time.sleep(2)
    tn.write(b"\n")
    time.sleep(2)
    tn.write(b"\n")
    time.sleep(2)
    tn.write(b"exit\n")
    lastpost = tn.read_all().decode('ascii')
    print(lastpost)
    op=open ("output.txt", "a").write(lastpost)
    tn.close()