Craig
Rebekah
Zina
Stella
Zachary
Ila
Delsie
Mauro
Alba
Antoniette
.... more

def script():

    old_list = []
    old_names_list = [line.rstrip('n') for line in open('names.txt')]


    while True:
        new_names_list = [line.rstrip('n') for line in open('newnames.txt')]

        #if new name added to the list, then we call a random function etc def hell():
        #and we continue to do the below.

        for names in old_names_list:

            if names not in old_list:
                print(names)
                #Call a random function etc def hello():
                old_list.append(names)

        else:
            randomtime = random.randint(5, 15)
            print('No new names fouund! - retrying in {} secs'.format(randomtime))
            time.sleep(randomtime)

Rebekah
Zina
Stella

Etc output:

Prints out all the names and continue the while True loop.

*Adding Craig to newnames.txt*

print("Found Craig in the old_list!")

continue to search if new names got added.