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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
OSError); 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)
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header in its HTTP requests.
The optional *timeout* parameter specifies a timeout in seconds for
blocking operations like the connection attempt (if not specified, the
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HTTPS and FTP connections.
If *context* is specified, it must be a ssl.SSLContext instance describing
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The optional *cafile* and *capath* parameters specify a set of trusted CA
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auth_cachetriesmaxtriesrI rL rL rM r ] s zFancyURLopener.__init__c C s t ||d| |S )z3Default error handling -- don't raise an exception.r( )r r/ rL rL rM r c s z!FancyURLopener.http_error_defaultNc C s~ | j d7 _ zb| jrR| j | jkrRt| dr4| j}n| j}|||dd|W d| _ S | ||||||}|W d| _ S d| _ 0 dS )z%Error 302 -- relocated (temporarily).rV http_error_500r z)Internal Server Error: Redirect Recursionr N)rC rD r rE r redirect_internal) r rH rh r- r. ri rI r rk rL rL rM r g s&
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z FancyURLopener.get_user_passwdc C sV ddl }z.td||f }| d|||f }||fW S tyP t Y dS 0 dS )z#Override this in a GUI environment!r Nz Enter username for %s at %s: z#Enter password for %s in %s at %s: r< )getpassinputKeyboardInterruptprint)r rz r9 rZ r r1 rL rL rM rY ! s
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zftpwrapper.closec C s2 | | jd8 _| jdkr.| js.| d S )NrV r )rh rc rd rm r rL rL rM rj s zftpwrapper.file_closec C s0 | z| j W n t y* Y n0 d S rN )rh r r r8 r rL rL rM rm s
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-r c C s i } t j D ]4\}}| }|r|dd dkr|| |dd < qdt jv rZ| dd t j D ]J\}}|dd dkrd| }|r|| |dd < qd| |dd d qd| S )a Return a dictionary of scheme -> proxy server URL mappings.
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iN_proxyZREQUEST_METHODr )r[ environr rx r )r& r_ r rL rL rM getproxies_environment s
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This function uses the MacOSX framework SystemConfiguration
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proxy_settings come from _scproxy._get_proxy_settings or get mocked ie:
{ 'exclude_simple': bool,
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s r c C s t S )zReturn a dictionary of scheme -> proxy server URL mappings.
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s r c C s t }|rt| |S t| S dS )zReturn True, if host should be bypassed.
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