更新

Python-100-Days/Day01-15/Day13/multithread3.py

@@ -0,0 +1,47 @@
+"""
+
+使用多线程的情况 - 模拟多个下载任务
+
+Version: 0.1
+Author: 骆昊
+Date: 2018-03-20
+
+"""
+
+from random import randint
+from time import time, sleep
+import threading
+
+
+class DownloadTask(threading.Thread):
+
+	def __init__(self, filename):
+		super().__init__()
+		self._filename = filename
+
+	def run(self):
+		print('开始下载%s...' % self._filename)
+		time_to_download = randint(5, 10)
+		print('剩余时间%d秒.' % time_to_download)
+		sleep(time_to_download)
+		print('%s下载完成!' % self._filename)
+
+
+def main():
+	start = time()
+	# 将多个下载任务放到多个线程中执行
+	# 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
+	thread1 = DownloadTask('Python从入门到住院.pdf')
+	thread1.start()
+	thread2 = DownloadTask('Peking Hot.avi')
+	thread2.start()
+	thread1.join()
+	thread2.join()
+	end = time()
+	print('总共耗费了%.3f秒' % (end - start))
+
+
+if __name__ == '__main__':
+	main()
+
+# 请注意通过threading.Thread创建的线程默认是非守护线程