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

class AllowAllKeys(pm.MissingHostKeyPolicy):
    def missing_host_key(self, client, hostname, key):
        return

HOST = '192.1.10.1'
USER = 'karn'
PASSWORD = 'mypass'

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
uname -a
uptime
who
exit
''')
print stdout.read()

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

#  cat ServerList.txt
Server1
Server2
Server3
......

OR
# cat ServerList2
192.168.1.1
192.168.1.2

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

class AllowAllKeys(pm.MissingHostKeyPolicy):
    def missing_host_key(self, client, hostname, key):
        return

USER = 'karn'
PASSWORD = 'mypass'

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())
with open ('thigo.txt', 'r') as hosts:
   for line in hosts:
       Serv = line.split()
       print Serv
       client.connect(Serv, 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()

Traceback (most recent call last):

      File "gopygooo.py", line 23, in <module>
        client.connect(Serv, username=USER, password=PASSWORD)
      File "/usr/lib/python2.6/site-packages/paramiko/client.py", line 277, in connect
        socket.getaddrinfo(hostname, port):
    TypeError: getaddrinfo() argument 1 must be string or None