#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
import paramiko
import os
hosts = open("hosts.txt","r").readlines()
def my_connection(line):
    try:
        ssh = paramiko.SSHClient()
        ssh.connect(line, username='my_login', key_filename="/home/my_homedir/.ssh/id_rsa")
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        stdin, stdout, stderr = ssh.exec_command('uptime')
        output = stdout.readlines()
        print output
    except paramiko.AuthenticationException, e:
        print(e)
        sys.exit(0)
    except paramiko.BadHostKeyException, e:
        print(e)
        sys.exit(0)
    except Exception, e:
        print(e)
        sys.exit(0)
hosts = open("hosts.txt","r").readlines()
for line in hosts:
    line.strip()
    line = str(line)
    print line
    my_connection(line)

(-2, 'Name or service not known')

Traceback (most recent call last):
  File "./file_parser.py", line 38, in ?
    my_connection(line)
  File "./file_parser.py", line 16, in my_connection
    ssh.connect(line, username='my_username', key_filename="/home/my_homedir/.ssh/id_rsa")
  File "/usr/lib/python2.4/site-packages/paramiko/client.py", line 278, in connect
    for (family, socktype, proto, canonname, sockaddr) in socket.getaddrinfo(hostname, port, socket.AF_UNSPEC, socket.SOCK_STREAM):
socket.gaierror: (-2, 'Name or service not known')