python实现从网络下载文件并获得文件大小及类型的方法

import urllib2from settings import COOKIESopener = urllib2.build_opener()cookies = ";".join("%s=%s" % (k, v) for k, v in COOKIES.items())opener.addheaders.append(('Cookie', cookies))req = opener.open(link)meta = req.info()file_size = int(meta.getheaders("Content-Length")[0])content_type = meta.getheaders('Content-Type')[0].split(';')[0]print file_size, content_typeopen(file_name, 'wb').write(req.read())