# Set username and password equal to something incorrect so that the prompt runs at least once
# Set logged count to any number -  this is how many attempts will be made until system quits.
# 1 == 1 loop keeps program running forever.
# CONTINUING ISSUES: logged - 1

while 1 == 1:

    password = ""
    username = ""
    logged = 4

    print "Welcome.  Please enter a username and password to login.\n"

    while logged != 0:

        while username != "user":
            username = raw_input("Username: ")
            logged = logged - 1
            if logged == 0:
                print "Username/password attempts exceeded.  System is now locked."
                quit()

        while password != "pass":
            password = raw_input("Password: ")
            logged = logged - 1
            if logged == 0:
                print "Username/password attempts exceeded.  System is now locked."
                quit()

        print "\nWelcome " + username.upper() + ".  Type 'Lock' to lock system at any time.  You will be required to re-enter your username and password for security purposes."

        while logged > 0:
            command = raw_input(">>> ")
            if command == "Lock":
                logged = 0
        if logged == 0:
            print "System locked via user input."