import  optparse
import  pexpect
import  sys
import  time

from    optparse  import  OptionParser
from    time      import  localtime, strftime

#
# General
SSH_BIN                         = '/usr/bin/ssh'
DEBUG                           = True
NO_DATE                         = False

#
# SSH Expected Prompt Configuration
SSH_PASSWORD_PROMPT             = '.*password: '
SSH_PASSWORD_FAILED_TEXT        = '.*password: '
SSH_LOGIN_SUCCEESS_TEXT         = '.*-> '

#
# Commands to be sent
JUNIPER_SAVE_CONFIG_CMD_PREFIX  =  'save config from flash to'

DEVICE_USERNAME                 = 'admin'
DEVICE_PASSWORD                 = ''
DEVICE_ADDRESS                  = ''

EXIT_CODE_FAIL                  = 1
EXIT_CODE_SUCCESS               = 0

#
# Function Defs.
#                                     Wheeeeeeeee......
#
def build_ssh_command(  user = DEVICE_USERNAME, \
                        pasw = DEVICE_PASSWORD, \
                        addr = DEVICE_ADDRESS   ):
  if (not addr):
    raise ValueError("No address specified!")
  elif (user):
    destination = user + '@' + addr
  else:
    destination = addr

  # This could probably be done in a much safer, much more
  # intelligent way, but for now, concat for the win!
  command = SSH_BIN + ' ' + dest
  return command

def perform_expect_command( expect_child, \
                            expect_line = '', \
                            response_line = '', \
                            timeout = 0 ):

  if ( timeout > 0):
    expect_child.expect(expect_line, timeout=timeout)
  else:
    expect_child.expect(expect_line)

  expect_child.sendline(response_line)


# Command line parsing
parser = OptionParser()

parser.add_option("-H", "--hostname", dest="address")
parser.add_option("-u", "--username", dest="username")
parser.add_option("-p", "--password", dest="password")
parser.add_option("-t", "--tftp-address", dest="tftp-address")
parser.add_option("-f", "--filename", dest="filename")
parser.add_option("-d", "--debug", dest="DEBUG", action="store_true")
parser.add_option("-D", "--no-date", dest="NO_DATE", action="store_true")

(options, args) = parser.parse_args()


####### ssh_proc = pexpect.spawn ( build_ssh_command

try:
  cmd = build_ssh_command( options['username'], options['password'], options['address'] )
  print cmd
except ValueError:
  print str(ValueError)
  sys.exit(EXIT_CODE_FAIL)

#####################
Error:
Traceback (most recent call last):
  File "./juniper-tftp-backup.py", line 97, in <module>
    cmd = build_ssh_command( options['username'], options['password'], options['address'] )
AttributeError: Values instance has no attribute '__getitem__'