[Python]-urllib and URLLIB2 modules

Transferred from: http://zeping.blog.51cto.com/6140112/1143722

Urllib and URLLIB2 are all related modules that accept URL requests, but provide different functionality.

Urllib provides the UrlEncode method for generating a Get query string, and Urllib2 does not.

Urllib:

Web Base:

2. Import Urllib
4. #打开51cto
6. CTO = Urllib.urlopen (' http://www.51cto.com ')
8. #打开本地文件: CTO = Urllib.urlopen (url= ' file:/root/python/ulib ')
10. #打开ftp: CTO = Urllib.urlopen (url= ' ftp://username: password @ftp address/')
12. #读取51cto首页的代码
14. Print Cto.read ()
16. #获取远程服务器返回的头信息, almost like Curl-i www,51cto.com.
18. Print Cto.info ()
20. #返回http状态码, 200 indicates success, 404 means URL not found
22. Print Cto.getcode ()
24. #返回请求的URL
26. Print Cto.geturl ()
28. #运行结果
30. [[email protected] python] #python Ctourl
32. 。。。。。。。 Omit Cto.read () function, output too much .....
34. Server:tengine #cto. info () return information
36. date:wed, Feb ::
38. Content-type:text/html
40. Connection:close
42. Vary:accept-encoding
44. Load-balancing:web48
48. #cto. GetCode () return information
50. http://www. 51cto.com #cto. Geturl () return information
52. #urlopen返回的是一个类文件对象, and the way this object is used and the file object's
54. #使用方法完全一样.

Encoding and decoding of characters:

2. Import Urllib,os
4. #对字符串进行编码
6. Stra = Urllib.quote (' This is Python ')
8. Print Stra
10. #对字符串进行解码
12. Print Urllib.unquote (stra)
14. #这个方法用 ' + ' instead of%20 and urllib.quote similar,
16. STRB = Urllib.quote_plus (' This is Python ')
18. Print STRB
20. #解码
22. Print Urllib.unquote_plus (STRB)
26. dicta = {' name ': 'zeping ',' passwd ':' 123456 '}
28. #urlencode将字典转换成url参数
30. Print Urllib.urlencode (dicta)
34. #将本地路径转换成url路径
36. filename = Urllib.pathname2url ('/python/test.py ')
38. Print filename
40. #将url路径转换成本地路径
42. Print urllib.url2pathname (filename)
46. ######### #运行结果 ##########
48. [[email protected] python] # Python Quote
50. this%20is%20python
52. This is python
54. this+Is+python
56. This is python
58. passwd=123456&name=zeping
60. /python/test.py
62. /python/test.py

Urllib.urlretrieve (): Download

2. Import Urllib
4. def Schedule (a,b,c):
6. "' "
8. A: Data blocks that have already been downloaded
10. B: Size of the data block
12. C: The size of the remote file
14. ‘‘‘
16. per = 100.0 * A * b/c
18. if per > :
20. per =
22. print '%.2f%% '% per
26. #这里以下载缓存插件为例
28. url = ' http://fastlnmp.googlecode.com/files/eaccelerator-0.9.6.tar.bz2 '
30. #获取文件名, here is the download to the current directory, if you want to download to another directory must
32. #须输入绝对路径和文件名字:/root/tools/eaccelerator-0.9.6.tar.bz2
34. Local = Url.split ('/') [-1]
36. Urllib.urlretrieve (Url,local,schedule)
38. ######## #运行结果 ##########
40. [[email protected] urllib] # python down
42. 0%
44. 7.74%
46. 15.48%
48. 23.22%
50. 30.96%
52. 38.7%
54. 46.44%
56. 54.18%
58. 61.92%
60. 69.66%
62. 77.4%
64. 85.15%
66. 92.89%
68. 100%
70. [[email protected] urllib] # ls
72. Down eaccelerator-0.9. 6.tar.bz2 ulib2

URLLIB2:

Urllib2 can accept an instance of the request class to set the URL request headers,urllib only the URL can be accepted.

Above transfer from: http://zeping.blog.51cto.com/6140112/1143722

[Python]-urllib and URLLIB2 modules