我有一个程序，我正在尝试创建它来在网络中搜索特定的 mac 地址。

当我运行 cisco 命令“show mac-address-table”时，它会给出保存到 MH2 的输出。如果该输出中有“000c.”，则所有输出都会保存到一个 txt 文件中，我希望能够根据所使用的命令（show mac address-table 与 show mac-address-table）过滤并从中提取 vlan，因为带有 mac 地址的行的 vlan 位置可能在左侧或右侧。我计划稍后弄清楚该部分，但目前看来我的脚本似乎没有读取文件（该文件正在获取正确的输出并且其中有一个“000c。”条目）我将输入以下代码：

#!/usr/bin/env python3

from time import sleep
import telnetlib
from getpass import getpass



# f is the .txt document that lists the IP's we'll be using.
f = open("devicess.txt")
#
username = input("please provide your username:")
password = getpass()

#
for line in f:
    device = (line)
    print('Starting to collect information, please wait')

#For those devices in the above list, connect and run the below commands
    def loopstart():
        for device in f:
            tn = telnetlib.Telnet()
            tn.open(device, 23, 20)
            #Remove # in the line below for debug
            #tn.set_debuglevel(2000)
            tn.read_until(b"Username:", timeout = 20)
            sleep(.25)
            tn.write(str(username + "\n").encode("ascii"))
            sleep(.25)
            tn.read_until(b"Password: ", timeout = 10)
            sleep(.25)
            tn.write((password + "\n").encode("ascii"))
            sleep(.25)
            #####################################
            #Verify Login attempt below         #
            #####################################
            try:
                enablemode = tn.read_until(b"#")
                if (b"FAIL") in enablemode:
                    print("Bad credentials to " + device)
                    tn.close()
                    sleep(.5)
                elif (b"fail") in enablemode:
                    print("Bad credentials to " + device)
                    tn.close()
                    sleep(.5)
                elif (b"#") in enablemode:
                    print("connection established to " + device)
                    try:
                        tn.write(str("show mac address-table | include 000c.\n").encode('ascii'))
                        sleep(2)
                        MH2 = tn.read_very_eager() 
                        if (b"000c.15") in MH2:
                            try:
                                sleep(.5)
                                mactable = open("mactable.txt", "rb+")
                                mactable.seek(0)
                                mactable.write(MH2)
                                mactable.truncate()
                                OP1 = mactable.read
                                for line in OP1():
                                    CPMAC = (line)    
                                    try:
                                        if (b"000c.15") in CPMAC:
                                            print("line 70 in use")
                                            print((CPMAC) + " this is what vlan the cyber power device should be on")
                                            tn.write(str("show interface vlan" + (CPMAC[:6]) + "\n")).encode("ascii")
                                            tn.read_until(b"Internet Address")
                                            tn.close()
                                        elif (str("All")) in (CPMAC):
                                            print ("CPU has matching MAC, moving to next device")
                                            tn.close()
                                        else:
                                            print("No Cyber power device found on " + device)
                                            tn.close()
                                    except EOFError as e:
                                        print("could not pull vlan from output")
                            except EOFError as e:
                                print("unidentified issue")
            #Execute the following commands in case of invalid command input
                        elif (b"Invalid") in MH2:
                            sleep(.5)
                            try:
                                tn.write(str("show mac-address-table | in 000c.\n").encode('ascii'))
                                sleep(2)
                                MH3 = tn.read_very_eager()
                                if (b"000c.15") in MH3:
                                    print("Line 90 in use")
                                    try:
                                        sleep(.5)
                                        mactable = open("mactable.txt", "r+")
                                        mactable.seek(0)
                                        mactable.write(str(MH3))
                                        OP2 = (mactable.read())
                                        print (type(OP2))
                                        mactable.truncate()
                                        for line in OP2():
                                            CPMAC = (line)
                                            try:  
                                                if ("000c.15") in (CPMAC):
                                                    print((CPMAC) + " this is what vlan the cyber power device should be on")
                                                    tn.write(str("show interface vlan" + (CPMAC[:6])+ "\n").encode("ascii"))
                                                    tn.read_until(b"Internet Address")
                                                    tn.close()
                                                elif (str("All")) in (CPMAC):
                                                    print ("CPU has matching MAC, moving to next device")
                                                    tn.close()
                                                else:
                                                    print("No Cyber power device found on " + device)
                                                    tn.close()
                                            except EOFError as e:
                                                print("could not pull vlan from output")
                                    except EOFError as e:
                                        print("unidentified issue")     
                                elif (b"000c.15") not in MH3:
                                    print ("Cyber power device not found, moving to next device.")
                                    tn.close()
                                else:
                                    print("Unknown Error")
                                    tn.close()

    ##############################
    #        Logout commands     #
    ##############################
                            except EOFError as e:
                                print("Connection closed to " + device)
                        else:
                            tn.write(str("exit\n").encode('ascii'))
                            tn.write(str("exit\n").encode('ascii'))
                            tn.close()
                            print(tn.read_all().decode('ascii'))
                    except EOFError as e:
                        print ("unknown error")
                else:
                    tn.close()
            except EOFError as e:
                print("Connection closed to " + device)
        except Exception as exception:
            print(exception, False)
            tn.close()
    loopstart()
print('script complete') 

“if ("000c.15") in (CPMAC)”是我认为我遇到麻烦的代码部分。任何帮助都非常感谢！