def simulation(num_seconds, pages_per_minute):
labprinter = Printer(pages_per_minute)
print_queue = Queue()
waiting_times = []
for current_second in range(num_seconds):
# check if new task is generated
if new_print_task():
task = Task(current_second)
print_queue.enqueue(task)
# feed queue to printer
if (not labprinter.busy()) and (not print_queue.isEmpty()):
nexttask = print_queue.deque()
waiting_times.append(nexttask.waitTime(current_second))
labprinter.startNext(nexttask)
labprinter.tick()
average_wait = sum(waiting_times) / len(waiting_times)
print("The average wait time is %f" % average_wait)
