from jnpr.junos import Device
from getpass import getpass
import sys
import logging, time
import pprint


ip =  sys.argv[1]
username =  sys.argv[2]
password =  sys.argv[3]

dev = Device(host=ip, user=username, passwd=password)

try:
    dev.open()
except Exception as err:
    print (err)
    sys.exit(1)