CODEWITHSUNDEEP
pythonpexpect
Vijay
Vijay

Reputation: 1817

Need assistance with pexpect module - script doesn't find the match

I'm writing a small piece of code to telnet into a switch and give username and password. I use pexpect spawn class for achieving this.

i have created a prompt_list with looking out for 'login' and 'password' and then enter username and password.

the problem that i see is pexpect matches 'login' but not the password. after running it for 2 -3 times, then it matches. do i have to add some delay or something like that to make it work on the first time.

can someone kindly help...

try:
    child = pexpect.spawn(cmd, timeout= 100)
    child.logfile = sys.stdout
    child.sendline('\n')
    conn = True
except:
    print ' some exception occured'                
if conn:
    i = child.expect(prompt_list, timeout = 10)
    if i == 0:
        print 'inside login prompt'
        child.sendline('admin')
        i = child.expect(prompt_list, timeout = 10)
    if i == 1:
        print 'Inside password prompt'
        child.sendline('password')
        i = child.expect(prompt_list, timeout = 10)

my prompt_list is:

prompt_list = ['login:','Password:']

when i run this, i get the following error

Switch login: inside login prompt
admin

the prompt that i get when i login to switch manually is as follows.

switch login: admin
Password:

Upvotes: 1

Views: 1053

Answers (1)

Padraic Cunningham
Padraic Cunningham

Reputation: 180401

Your child.sendline('\n') in the try/except is causing a problem:

import pexpect
conn = False
import sys

try:
    child = pexpect.spawn("telnet 127.0.0.1", timeout= 100)
    child.logfile = sys.stdout
    conn = True
except:
    print ' some exception occured'

if conn:
    child.expect(":", timeout = 10)
    child.sendline('user')
    child.expect(":", timeout = 10)
    child.sendline('password')
    child.expect(">")

Upvotes: 1

Related Questions