066 用多线程从网上下载图像文件

在urls.txt文件中包含了若干个图像url，一行一个url，请使用多线程下载这些图像文件，并按url出现的顺序保存为0.jpg、1.jpg、2.jpg，依次类推。

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from urllib3 import * import threading   http = PoolManager() disable_warnings()   f = open('urls.txt', 'r') urlList = [] while True:     url = f.readline()     if url == '':         break     urlList.append(url.strip()) f.close()   print(urlList)   class DownloadThread(threading.Thread):     def __init__(self, func, args):         super().__init__(func, args)   def donwload(filename, url):     response = http.request('GET', url)     f = open(filename, 'wb')     f.write(response.data)     f.close()     print('<', url, '>', '下载完成')   for i in range(len(urlList)):     thread = DownloadThread(donwload, (str(i) + '.jpg', urlList[i]))     thread.start()