脚本在IDLE中工作，但不是命令行Ubuntu

Question

我尝试从“Programming Python”Mark Lutz运行简单的代码。当我从IDLE跑出来时，一切都很好。当我从命令行运行时脚本不起作用 - 没有输出，任何错误，只是在time.sleep()中定义的时间之后完成。

如何从命令行正确运行此脚本？ 我正在使用Ubuntu。

import Queue, thread, time


    producersnumber=3
    consumersnumber=1
    msgnum=3
    dataqueue=Queue.Queue()#why double
    safeprint=thread.allocate_lock()

    def producer(no):
        for i in range(msgnum):
            p='signalfrom %s'%no
            time.sleep(1)
            dataqueue.put(p)

    def consumer(no):
        while 1:
            time.sleep(1)
            try:
                data=dataqueue.get(block=False)
            except Queue.Empty:
                pass
            else:
                safeprint.acquire()
                print data
                safeprint.release()
    if __name__=='__main__':
        for i in range(consumersnumber):
            thread.start_new_thread(consumer,(i,))
        for i in range(producersnumber):
            thread.start_new_thread(producer,(i,))
        time.sleep(1)

Answer 1

Your time.sleep(1), in the last line, will kill the threads by program exit before they actually do anything (as the producer waits for a second before sending anything). Change that line to time.sleep(10) or diminish the values for time.sleep() that you have in the producer or consumer.

With time.sleep(10) you'll get:

signalfrom 1
signalfrom 0
signalfrom 2
signalfrom 1
signalfrom 0
signalfrom 2
signalfrom 1
signalfrom 0
signalfrom 2