def simulation(numSeconds,pagesPerMinute):
labPrinter = Printer(pagesPerMinute) #初始化打印机
printQueue = Queue() #初始化任务等待队
waitingTimes = [] #记录每个任务的等待时间
for currentSecond in range(numSeconds): #0~3600s
if newPrintTask(): #创建新任务
task = Task(currentSecond)#当前任务及时间
printQueue.enqueue(task)#进入打印队列
#print('newPrintTask')
if (not labPrinter.isBusy() ) and (not printQueue.isEmpty()):#打印机空闲并且有任务在等待
nextTask = printQueue.dequeue() #弹出下一个任务
waitingTimes.append(nextTask.waitTime(currentSecond)) #计算并记录等待时间
labPrinter.loadNext(nextTask) #载入新的任务
labPrinter.printTick()
averageWait = sum(waitingTimes)/len(waitingTimes)
print("Average Wait %6.2f secs %3d tasks remaining."%(averageWait,printQueue.size()))
