urllib.request.urlretrieve用法

1'''　　urllib.request.urltrieve(url,filename=None,reporthook=None,data=None)　　url:远程服务器地址（即需要获取数据的地址）　　filename:将远程获取的数据存放入的文件名'''import urllib.request
2def callback(blocknum, blocksize, totalsize):
3    '''
4    :param blocknum: 已下载数据块
5    :param blocksize: 数据块大小
6    :param totalsize: 远程文件大小
7    :return:
8    '''
9    percent = 100.0*blocknum*blocksize/totalsize
10    if(percent>100):
11        percent = 100
12    print('%.2f%%' % percent)
13
14url = 'http://www.sina.com.cn'
15local = 'f:\\sina.html'
16a,b = urllib.request.urlretrieve(url, local, callback) #从远程下载数据
17print(a)
18print(b)
19
20#输出结果
210.00%
221.39%
23
24...
25
2688.90%
2794.46%
2895.84%
2997.23%
3098.62%
31100.00%
32#输出a
33f:\sina.html
34#输出b
35Server: nginx
36Date: Fri, 08 Jun 2018 02:50:40 GMT
37Content-Type: text/html
38Content-Length: 589755
39Connection: close
40Last-Modified: Fri, 08 Jun 2018 02:50:01 GMT
41Vary: Accept-Encoding
42X-Powered-By: shci_v1.03
43Expires: Fri, 08 Jun 2018 02:51:22 GMT
44Cache-Control: max-age=60
45Age: 18
46Via: http/1.1 cnc.guangzhou.ha2ts4.59 (ApacheTrafficServer/6.2.1 [cHs f ])
47X-Cache: HIT.59
48X-Via-CDN: f=edge,s=cnc.guangzhou.ha2ts4.60.nb.sinaedge.com,c=42.49.109.219;f=Edge,s=cnc.guangzhou.ha2ts4.59,c=112.90.6.60
49X-Via-Edge: 1528426240834db6d312aee065a707941b2ee