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An extensible library for opening URLs using a variety of protocols
The simplest way to use this module is to call the urlopen function,
which accepts a string containing a URL or a Request object (described
below). It opens the URL and returns the results as file-like
object; the returned object has some extra methods described below.
The OpenerDirector manages a collection of Handler objects that do
all the actual work. Each Handler implements a particular protocol or
option. The OpenerDirector is a composite object that invokes the
Handlers needed to open the requested URL. For example, the
HTTPHandler performs HTTP GET and POST requests and deals with
non-error returns. The HTTPRedirectHandler automatically deals with
HTTP 301, 302, 303 and 307 redirect errors, and the HTTPDigestAuthHandler
deals with digest authentication.
urlopen(url, data=None) -- Basic usage is the same as original
urllib. pass the url and optionally data to post to an HTTP URL, and
get a file-like object back. One difference is that you can also pass
a Request instance instead of URL. Raises a URLError (subclass of
IOError); for HTTP errors, raises an HTTPError, which can also be
treated as a valid response.
build_opener -- Function that creates a new OpenerDirector instance.
Will install the default handlers. Accepts one or more Handlers as
arguments, either instances or Handler classes that it will
instantiate. If one of the argument is a subclass of the default
handler, the argument will be installed instead of the default.
install_opener -- Installs a new opener as the default opener.
objects of interest:
OpenerDirector -- Sets up the User Agent as the Python-urllib client and manages
the Handler classes, while dealing with requests and responses.
Request -- An object that encapsulates the state of a request. The
state can be as simple as the URL. It can also include extra HTTP
headers, e.g. a User-Agent.
BaseHandler --
internals:
BaseHandler and parent
_call_chain conventions
Example usage:
import urllib.request
# set up authentication info
authinfo = urllib.request.HTTPBasicAuthHandler()
authinfo.add_password(realm='PDQ Application',
uri='https://mahler:8092/site-updates.py',
user='klem',
passwd='geheim$parole')
proxy_support = urllib.request.ProxyHandler({"http" : "http://ahad-haam:3128"})
# build a new opener that adds authentication and caching FTP handlers
opener = urllib.request.build_opener(proxy_support, authinfo,
urllib.request.CacheFTPHandler)
# install it
urllib.request.install_opener(opener)
f = urllib.request.urlopen('http://www.python.org/')
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Retrieve a URL into a temporary location on disk.
Requires a URL argument. If a filename is passed, it is used as
the temporary file location. The reporthook argument should be
a callable that accepts a block number, a read size, and the
total file size of the URL target. The data argument should be
valid URL encoded data.
If a filename is passed and the URL points to a local resource,
the result is a copy from local file to new file.
Returns a tuple containing the path to the newly created
data file as well as the resulting HTTPMessage object.
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u :\d+$c C sY | j } t | � d } | d k r: | j d d � } n t j d | d � } | j � S( u� Return request-host, as defined by RFC 2965.
Variation from RFC: returned value is lowercased, for convenient
comparison.
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>>> _parse_proxy('file:/ftp.example.com/')
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ValueError: proxy URL with no authority: 'file:/ftp.example.com/'
The first three items of the returned tuple may be None.
Examples of authority parsing:
>>> _parse_proxy('proxy.example.com')
(None, None, None, 'proxy.example.com')
>>> _parse_proxy('proxy.example.com:3128')
(None, None, None, 'proxy.example.com:3128')
The authority component may optionally include userinfo (assumed to be
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>>> _parse_proxy('joe:password@proxy.example.com')
(None, 'joe', 'password', 'proxy.example.com')
>>> _parse_proxy('joe:password@proxy.example.com:3128')
(None, 'joe', 'password', 'proxy.example.com:3128')
Same examples, but with URLs instead:
>>> _parse_proxy('http://proxy.example.com/')
('http', None, None, 'proxy.example.com')
>>> _parse_proxy('http://proxy.example.com:3128/')
('http', None, None, 'proxy.example.com:3128')
>>> _parse_proxy('http://joe:password@proxy.example.com/')
('http', 'joe', 'password', 'proxy.example.com')
>>> _parse_proxy('http://joe:password@proxy.example.com:3128')
('http', 'joe', 'password', 'proxy.example.com:3128')
Everything after the authority is ignored:
>>> _parse_proxy('ftp://joe:password@proxy.example.com/rubbish:3128')
('ftp', 'joe', 'password', 'proxy.example.com')
Test for no trailing '/' case:
>>> _parse_proxy('http://joe:password@proxy.example.com')
('http', 'joe', 'password', 'proxy.example.com')
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