48 lines
1.0 KiB
Python
48 lines
1.0 KiB
Python
"""
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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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