如何将 Telnet 输出存储到 python 中的变量中

Question

I am trying to use telnet to run a command and grab a value from a text output and store it in a variable in python. In the image, the value I am trying to grab is the External alarm contact 2: Analog input value. In this case 5.99 which I want stored in a variable. I need to store the 5.99 value or whatever it may change to in a variable

Answer 1

If you are using the telnetlib library for Python, you can use read_until() and specify a string it should read up to, or read_all() to read the output until EOF and obtain the output from the string.

import getpass
import sys
import telnetlib

HOST = "localhost"
user = raw_input("Enter your remote account: ")
password = getpass.getpass()

tn = telnetlib.Telnet(HOST)

tn.read_until("login: ")
tn.write(user + "\n")
if password:
    tn.read_until("Password: ")
    tn.write(password + "\n")

tn.write("ls\n")
tn.write("exit\n")

print tn.read_all()

https://docs.python.org/2/library/telnetlib.html#telnet-objects