requests 下载视频

import os,timeimport requestsdef downloadFile(name, url):    headers = {
   'Proxy-Connection': 'keep-alive'}    r = requests.get(url, stream=True, headers=headers)    length = float(r.headers['content-length'])    f = open(name, 'wb')    count = 0    count_tmp = 0    time1 = time.time()    for chunk in r.iter_content(chunk_size=512):        if chunk:            f.write(chunk)            count += len(chunk)            if time.time() - time1 > 2:                p = count / length * 100                speed = (count - count_tmp) / 1024  / 2                count_tmp = count                print(name + ': ' + formatFloat(p) + '%' + ' Speed: ' + formatFloat(speed) + 'KB/S')                time1 = time.time()    f.close()def formatFloat(num):    return '{:.2f}'.format(num)if __name__ == '__main__':    downloadFile('movie6.mp4', 'http://download.xunleizuida.com/1905/神秘慈善家.BD1280高清中字版.mp4')