old_contents: # -*- coding: utf-8 -*-
  __author__ = 'John Moylan'
  from paramiko import SSHClient, SSHConfig, AutoAddPolicy
  
  from pyvarnish.settings import SSH_CONFIG
  
  
  class Varnish_admin():
  
      def __init__(self, server=''):
          self.server = server
          self.conf = self.config()
  
      def config(self):
          sshconfig = SSHConfig()
          sshconfig.parse(open(SSH_CONFIG))
          return sshconfig.lookup(self.server)
  
      def runcmd(self, cmd):
          try:
              client = SSHClient()
              client.load_system_host_keys()
              client.set_missing_host_key_policy(AutoAddPolicy())
              client.connect(self.conf['hostname'],
                              port = int(self.conf['port']),
                              username = self.conf['user'],
                              key_filename = self.conf['identityfile'],
                              password = None,)
              stdin, stdout, stderr = client.exec_command(cmd)
              return ''.join([i.rstrip('\r\n ').lstrip() for i in stdout.readlines()])
          finally:
              client.close()
new_contents: # -*- coding: utf-8 -*-
  __author__ = 'John Moylan'
  
  import sys
  
  from paramiko import SSHClient, SSHConfig, AutoAddPolicy
  
  from pyvarnish.settings import SSH_CONFIG
  
  
  class Varnish_admin():
  
      def __init__(self, server=''):
          self.server = server
          self.conf = self.config()
  
      def config(self):
          sshconfig = SSHConfig()
          try:
              sshconfig.parse(open(SSH_CONFIG))
          except IOError:
              print "your app needs to have a valid " \
                    "ssh config file location in settings.py"
              sys.exit(1)
          return sshconfig.lookup(self.server)
  
      def runcmd(self, cmd):
          try:
              client = SSHClient()
              client.load_system_host_keys()
              client.set_missing_host_key_policy(AutoAddPolicy())
              client.connect(self.conf['hostname'],
                              port = int(self.conf['port']),
                              username = self.conf['user'],
                              key_filename = self.conf['identityfile'],
                              password = None,)
              stdin, stdout, stderr = client.exec_command(cmd)
              return ''.join([i.rstrip('\r\n ').lstrip() for i in stdout.readlines()])
          finally:
              client.close()
subject: Add an exception if ssh not configured