python3.x中的urllib模块

来源http://my.oschina.net/u/999436/blog/113317

我尝试着找找python3.3.0的change log。里面并没有找到urllib的修改记录。然而这一修改记录却在python3.0的change log中。 
原文是这样写的：

---

a new urllib package was created. It consists of code from 
urllib, urllib2, urlparse, and robotparser. The old 
modules have all been removed. The new package has five submodules: 
urllib.parse, urllib.request, urllib.response, 
urllib.error, and urllib.robotparser. The 
urllib.request.urlopen() function uses the url opener from 
urllib2. (Note that the unittests have not been renamed for the 
beta, but they will be renamed in the future.)

---

原来，3.0版本中已经将urllib2、urlparse、和robotparser并入了urllib中，并且修改urllib模块，其中包含5个子模块，即是help()中看到的那五个名字。

为了今后使用方便，在此将每个包中包含的方法列举如下： 
urllib.error: ContentTooShortError; HTTPError; URLError

urllib.parse: parse_qs; parse_qsl; quote; quote_from_bytes; quote_plus; unquote

                  unquote_plus; unquote_to_bytes; urldefrag; urlencode; urljoin; urlparse;
                  urlsplit; urlunparse; urlunsplit

urllib.request: AbstractBasicAuthHandler; AbstractDigestAuthHandler; BaseHandler;

                    CatheFTPHandler; FTPHandler; FancyURLopener; FileHandler;
                    HTTPBasicAuthHandler; HTTPCookieProcessor; HTTPDefaultErrorHandler;
                    HTTPDigestAuthHandler; HTTPErrorProcessorl; HTTPHandler;
                    HTTPPasswordMgr; HTTPPasswordMgrWithDefaultRealm;
                    HTTPRedirectHandler; HTTPSHandler;OpenerDirector;ProxyBasicAuthHandler
                    ProxyDigestAuthHandler;  ProxyHandler; Request; URLopener;
                    UnknowHandler; build_opener; getproxies; install_opener; pathname2url;
                    url2pathname; urlcleanup; urlopen; urlretrieve;

urllib.response: addbase; addclosehook; addinfo; addinfourl;

urllib.robotparser: RobotFileParser

当然，python3.0的改动十分巨大，有需要可以参阅change log