#!/usr/bin/env python
import sys
import paramiko as pm
import os
sys.stderr = open('/dev/null')       # Silence silly warnings from paramiko
sys.stderr = sys.__stderr__


class AllowAllKeys(pm.MissingHostKeyPolicy):
    def missing_host_key(self, client, hostname, key):
        return
with open('host.txt') as f:
    for HOST in f:
        USER = 'test'
        PASSWORD = '123'

client = pm.SSHClient()
client.load_system_host_keys()
client.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
client.set_missing_host_key_policy(AllowAllKeys())
client.connect(HOST, username=USER, password=PASSWORD)

channel = client.invoke_shell()
stdin = channel.makefile('wb')
stdout = channel.makefile('rb')

stdin.write('''
hostname
lsb_release -a
exit
''')
print stdout.read()

stdout.close()
stdin.close()
client.close()

Traceback (most recent call last):
  File "Remoteconnect2.py", line 21, in <module>
    client.connect( HST, username=USER, password=PASSWORD )
  File "/usr/lib/python2.6/site-packages/paramiko/client.py", line 277, in connect
    socket.getaddrinfo(hostname, port):
socket.gaierror: [Errno -2] Name or service not known