python实现从网络下载文件并获得文件大小及类型的方法

import urllib2
from settings import COOKIES
opener = 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_type
open(file_name, 'wb').write(req.read())