pexpect

# pexpect notes

import pexpect
import re

ip_addr = '10.11.12.55'
username = 'myuser'
password = 'mypass'
port = 22

# Spawn a child process to connect to the router
ssh_conn = pexpect.spawn('ssh -l {} {} -p {}'.format(username, ip_addr, port))
ssh_conn.timeout = 3
ssh_conn.expect('ssword:')
ssh_conn.sendline(password)
ssh_conn.expect('myhostname#')

# This will print everything before the '#' sign
print ssh_conn.before

# This will print everything after the '#' sign and including the '#' sign
print ssh_conn.after

# To disable paging
ssh_conn.sendline('terminal length 0')
ssh_conn.expect('myhostname#')

# To send a command, this automatically sends the '\n'
ssh_conn.sendline('show ip int brief')
ssh_conn.expect('myhostname#')
print ssh_conn.before

# To try something and catch potential timeout
try:
	ssh_conn.sendline('show version')
	ssh_conn.expect('zzzz')
expect pexpect.TIMEOUT:
	print "Found timeout"

# You can match using regex
pattern = re.compile(r'^Lic.*DI:.*$', re.MULTILINE)
ssh_conn.sendline('show version')
ssh_conn.expect(pattern)
print ssh_conn.after