def load_pseudonyms():
    global GENERATE_NEW
    dirs = [os.path.abspath(os.path.dirname(fn)) for fn in sys.argv]

    dirs = list(set(dirs))

    for dir_ in dirs:
        fn = os.path.join(dir_, "pseudonyms.csv")
        try:
            reader = csv.reader(open(fn, 'r'))
        except IOError:
            continue

        print("Reading pseudonyms from %s" % fn)
        for line in reader:
            if len(line) > 0:
                try:
                    LOOKUP[int(line[0])] = int(line[1])
                except ValueError:
                    pass

    num_loaded = len(LOOKUP)

    if num_loaded == 0:
        print("I haven't loaded any pseudonyms, should I just generate a "
              "pseudonym for every NHS number I encounter?")
        if raw_input("Type y or n: ") == 'y':
            GENERATE_NEW = True
    else:
        print("Loaded %d pseudonyms NHS numbers." % num_loaded)
        GENERATE_NEW = False