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jackfrued

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GitHub Repository: jackfrued/Python-100-Days
 Path: blob/master/Day01-15/code/Day13/multithread3.py
Views: 729
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"""

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使用多线程的情况 - 模拟多个下载任务

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Version: 0.1

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Author: 骆昊

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Date: 2018-03-20

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"""

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from random import randint

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from time import time, sleep

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import threading

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class DownloadTask(threading.Thread):

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    def __init__(self, filename):

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        super().__init__()

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        self._filename = filename

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    def run(self):

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        print('开始下载%s...' % self._filename)

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        time_to_download = randint(5, 10)

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        print('剩余时间%d秒.' % time_to_download)

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        sleep(time_to_download)

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        print('%s下载完成!' % self._filename)

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def main():

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    start = time()

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    # 将多个下载任务放到多个线程中执行

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    # 通过自定义的线程类创建线程对象 线程启动后会回调执行run方法

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    thread1 = DownloadTask('Python从入门到住院.pdf')

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    thread1.start()

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    thread2 = DownloadTask('Peking Hot.avi')

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    thread2.start()

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    thread1.join()

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    thread2.join()

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    end = time()

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    print('总共耗费了%.3f秒' % (end - start))

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if __name__ == '__main__':

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    main()

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# 请注意通过threading.Thread创建的线程默认是非守护线程

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