python.15

import random


def get_port():
    port = random.randrange(33000, 37000, 1)
    return port


def check_list(port_list=[], count=0):
    if count == 0:
        print(port_list)

    port = get_port()

    if port in port_list:
        return "%s: %s in %s" % (count, port, len(port_list))
    else:
        count += 1
        port_list.append(port)
        return check_list(port_list, count)


print(check_list())
print(check_list())
print(check_list())