business@node-0.com

arrayLoops.py

#!/usr/bin/env python
import os;
import sys;

def printf(fmt, *varargs):
    sys.stdout.write(fmt % varargs)

domainListFile = "/root/acctWorkFiles/domainList.txt";
userListFile = "/root/acctWorkFiles/userList.txt";
passwordListFile = "/root/acctWorkFiles/passwordList.txt";

dlHandle = open(domainListFile);
ulHandle = open(userListFile);
plHandle = open(passwordListFile);

domainList = [domListItem.rstrip('\n') for domListItem in dlHandle];
userList = [usrListItem.rstrip('\n') for usrListItem in ulHandle];
passwordList = [passListItem.rstrip('\n') for passListItem in plHandle];

dlHandle.close(); ulHandle.close(); plHandle.close();

for i in range(len(domainList)):
    printf("%s:", domainList[i]);
    printf("%s:", userList[i]);
    printf("%s\n", passwordList[i]);

Bored at the NOC, so code...

#!/usr/bin/env python

with open("/root/acctWorkFiles/domainList.txt", "r") as domainListFile, open("/root/acctWorkFiles/userList.txt", "r") as userListFile, open("/root/acctWorkFiles/passwordList.txt", "r") as passwordListFile:
    domainList = domainListFile.read().splitlines()
    userList = userListFile.read().splitlines()
    passwordList = passwordListFile.read().splitlines()

for i in range(len(domainList)): print("%s - %s - %s", % (domainList[i], userList[i], passwordList[i]))

Nice, were you going for number of lines saved?
I actually wrote arrayLoops.py as an excercise in
how to write self documenting code i.e. Make things obvious
to a non-python programmer.