Commit 0f7ede45 authored by Georg Brandl's avatar Georg Brandl

Review the doc changes for the urllib package creation.

parent aca8fd7a
***************************************************** ***********************************************************
HOWTO Fetch Internet Resources Using urllib package HOWTO Fetch Internet Resources Using The urllib Package
***************************************************** ***********************************************************
:Author: `Michael Foord <http://www.voidspace.org.uk/python/index.shtml>`_ :Author: `Michael Foord <http://www.voidspace.org.uk/python/index.shtml>`_
.. note:: .. note::
There is an French translation of an earlier revision of this There is a French translation of an earlier revision of this
HOWTO, available at `urllib2 - Le Manuel manquant HOWTO, available at `urllib2 - Le Manuel manquant
<http://www.voidspace.org.uk/python/articles/urllib2_francais.shtml>`_. <http://www.voidspace.org.uk/python/articles/urllib2_francais.shtml>`_.
...@@ -18,7 +18,7 @@ Introduction ...@@ -18,7 +18,7 @@ Introduction
.. sidebar:: Related Articles .. sidebar:: Related Articles
You may also find useful the following article on fetching web resources You may also find useful the following article on fetching web resources
with Python : with Python:
* `Basic Authentication <http://www.voidspace.org.uk/python/articles/authentication.shtml>`_ * `Basic Authentication <http://www.voidspace.org.uk/python/articles/authentication.shtml>`_
...@@ -94,8 +94,8 @@ your browser does when you submit a HTML form that you filled in on the web. Not ...@@ -94,8 +94,8 @@ your browser does when you submit a HTML form that you filled in on the web. Not
all POSTs have to come from forms: you can use a POST to transmit arbitrary data all POSTs have to come from forms: you can use a POST to transmit arbitrary data
to your own application. In the common case of HTML forms, the data needs to be to your own application. In the common case of HTML forms, the data needs to be
encoded in a standard way, and then passed to the Request object as the ``data`` encoded in a standard way, and then passed to the Request object as the ``data``
argument. The encoding is done using a function from the ``urllib.parse`` library argument. The encoding is done using a function from the :mod:`urllib.parse`
*not* from ``urllib.request``. :: library. ::
import urllib.parse import urllib.parse
import urllib.request import urllib.request
...@@ -115,7 +115,7 @@ forms - see `HTML Specification, Form Submission ...@@ -115,7 +115,7 @@ forms - see `HTML Specification, Form Submission
<http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13>`_ for more <http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13>`_ for more
details). details).
If you do not pass the ``data`` argument, urllib.request uses a **GET** request. One If you do not pass the ``data`` argument, urllib uses a **GET** request. One
way in which GET and POST requests differ is that POST requests often have way in which GET and POST requests differ is that POST requests often have
"side-effects": they change the state of the system in some way (for example by "side-effects": they change the state of the system in some way (for example by
placing an order with the website for a hundredweight of tinned spam to be placing an order with the website for a hundredweight of tinned spam to be
...@@ -182,13 +182,15 @@ which comes after we have a look at what happens when things go wrong. ...@@ -182,13 +182,15 @@ which comes after we have a look at what happens when things go wrong.
Handling Exceptions Handling Exceptions
=================== ===================
*urllib.error* raises ``URLError`` when it cannot handle a response (though as usual *urlopen* raises ``URLError`` when it cannot handle a response (though as usual
with Python APIs, builtin exceptions such as ValueError, TypeError etc. may also with Python APIs, builtin exceptions such as ValueError, TypeError etc. may also
be raised). be raised).
``HTTPError`` is the subclass of ``URLError`` raised in the specific case of ``HTTPError`` is the subclass of ``URLError`` raised in the specific case of
HTTP URLs. HTTP URLs.
The exception classes are exported from the :mod:`urllib.error` module.
URLError URLError
-------- --------
...@@ -214,7 +216,7 @@ Every HTTP response from the server contains a numeric "status code". Sometimes ...@@ -214,7 +216,7 @@ Every HTTP response from the server contains a numeric "status code". Sometimes
the status code indicates that the server is unable to fulfil the request. The the status code indicates that the server is unable to fulfil the request. The
default handlers will handle some of these responses for you (for example, if default handlers will handle some of these responses for you (for example, if
the response is a "redirection" that requests the client fetch the document from the response is a "redirection" that requests the client fetch the document from
a different URL, urllib.request will handle that for you). For those it can't handle, a different URL, urllib will handle that for you). For those it can't handle,
urlopen will raise an ``HTTPError``. Typical errors include '404' (page not urlopen will raise an ``HTTPError``. Typical errors include '404' (page not
found), '403' (request forbidden), and '401' (authentication required). found), '403' (request forbidden), and '401' (authentication required).
...@@ -380,7 +382,7 @@ info and geturl ...@@ -380,7 +382,7 @@ info and geturl
The response returned by urlopen (or the ``HTTPError`` instance) has two useful The response returned by urlopen (or the ``HTTPError`` instance) has two useful
methods ``info`` and ``geturl`` and is defined in the module methods ``info`` and ``geturl`` and is defined in the module
``urllib.response``. :mod:`urllib.response`.
**geturl** - this returns the real URL of the page fetched. This is useful **geturl** - this returns the real URL of the page fetched. This is useful
because ``urlopen`` (or the opener object used) may have followed a because ``urlopen`` (or the opener object used) may have followed a
...@@ -388,7 +390,7 @@ redirect. The URL of the page fetched may not be the same as the URL requested. ...@@ -388,7 +390,7 @@ redirect. The URL of the page fetched may not be the same as the URL requested.
**info** - this returns a dictionary-like object that describes the page **info** - this returns a dictionary-like object that describes the page
fetched, particularly the headers sent by the server. It is currently an fetched, particularly the headers sent by the server. It is currently an
``http.client.HTTPMessage`` instance. :class:`http.client.HTTPMessage` instance.
Typical headers include 'Content-length', 'Content-type', and so on. See the Typical headers include 'Content-length', 'Content-type', and so on. See the
`Quick Reference to HTTP Headers <http://www.cs.tut.fi/~jkorpela/http.html>`_ `Quick Reference to HTTP Headers <http://www.cs.tut.fi/~jkorpela/http.html>`_
...@@ -508,7 +510,7 @@ not correct. ...@@ -508,7 +510,7 @@ not correct.
Proxies Proxies
======= =======
**urllib.request** will auto-detect your proxy settings and use those. This is through **urllib** will auto-detect your proxy settings and use those. This is through
the ``ProxyHandler`` which is part of the normal handler chain. Normally that's the ``ProxyHandler`` which is part of the normal handler chain. Normally that's
a good thing, but there are occasions when it may not be helpful [#]_. One way a good thing, but there are occasions when it may not be helpful [#]_. One way
to do this is to setup our own ``ProxyHandler``, with no proxies defined. This to do this is to setup our own ``ProxyHandler``, with no proxies defined. This
...@@ -528,8 +530,8 @@ is done using similar steps to setting up a `Basic Authentication`_ handler : :: ...@@ -528,8 +530,8 @@ is done using similar steps to setting up a `Basic Authentication`_ handler : ::
Sockets and Layers Sockets and Layers
================== ==================
The Python support for fetching resources from the web is layered. The Python support for fetching resources from the web is layered. urllib uses
urllib.request uses the http.client library, which in turn uses the socket library. the :mod:`http.client` library, which in turn uses the socket library.
As of Python 2.3 you can specify how long a socket should wait for a response As of Python 2.3 you can specify how long a socket should wait for a response
before timing out. This can be useful in applications which have to fetch web before timing out. This can be useful in applications which have to fetch web
...@@ -573,9 +575,9 @@ This document was reviewed and revised by John Lee. ...@@ -573,9 +575,9 @@ This document was reviewed and revised by John Lee.
`Quick Reference to HTTP Headers`_. `Quick Reference to HTTP Headers`_.
.. [#] In my case I have to use a proxy to access the internet at work. If you .. [#] In my case I have to use a proxy to access the internet at work. If you
attempt to fetch *localhost* URLs through this proxy it blocks them. IE attempt to fetch *localhost* URLs through this proxy it blocks them. IE
is set to use the proxy, which urllib2 picks up on. In order to test is set to use the proxy, which urllib picks up on. In order to test
scripts with a localhost server, I have to prevent urllib2 from using scripts with a localhost server, I have to prevent urllib from using
the proxy. the proxy.
.. [#] urllib2 opener for SSL proxy (CONNECT method): `ASPN Cookbook Recipe .. [#] urllib opener for SSL proxy (CONNECT method): `ASPN Cookbook Recipe
<http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/456195>`_. <http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/456195>`_.
...@@ -98,9 +98,9 @@ Functions provided: ...@@ -98,9 +98,9 @@ Functions provided:
And lets you write code like this:: And lets you write code like this::
from contextlib import closing from contextlib import closing
import urllib.request from urllib.request import urlopen
with closing(urllib.request.urlopen('http://www.python.org')) as page: with closing(urlopen('http://www.python.org')) as page:
for line in page: for line in page:
print(line) print(line)
......
...@@ -13,8 +13,7 @@ ...@@ -13,8 +13,7 @@
This module defines classes which implement the client side of the HTTP and This module defines classes which implement the client side of the HTTP and
HTTPS protocols. It is normally not used directly --- the module HTTPS protocols. It is normally not used directly --- the module
:mod:`urllib.request` :mod:`urllib.request` uses it to handle URLs that use HTTP and HTTPS.
uses it to handle URLs that use HTTP and HTTPS.
.. note:: .. note::
......
:mod:`robotparser` --- Parser for robots.txt
=============================================
.. module:: robotparser
:synopsis: Loads a robots.txt file and answers questions about
fetchability of other URLs.
.. sectionauthor:: Skip Montanaro <skip@pobox.com>
.. index::
single: WWW
single: World Wide Web
single: URL
single: robots.txt
This module provides a single class, :class:`RobotFileParser`, which answers
questions about whether or not a particular user agent can fetch a URL on the
Web site that published the :file:`robots.txt` file. For more details on the
structure of :file:`robots.txt` files, see http://www.robotstxt.org/orig.html.
.. class:: RobotFileParser()
This class provides a set of methods to read, parse and answer questions
about a single :file:`robots.txt` file.
.. method:: set_url(url)
Sets the URL referring to a :file:`robots.txt` file.
.. method:: read()
Reads the :file:`robots.txt` URL and feeds it to the parser.
.. method:: parse(lines)
Parses the lines argument.
.. method:: can_fetch(useragent, url)
Returns ``True`` if the *useragent* is allowed to fetch the *url*
according to the rules contained in the parsed :file:`robots.txt`
file.
.. method:: mtime()
Returns the time the ``robots.txt`` file was last fetched. This is
useful for long-running web spiders that need to check for new
``robots.txt`` files periodically.
.. method:: modified()
Sets the time the ``robots.txt`` file was last fetched to the current
time.
The following example demonstrates basic use of the RobotFileParser class. ::
>>> import robotparser
>>> rp = robotparser.RobotFileParser()
>>> rp.set_url("http://www.musi-cal.com/robots.txt")
>>> rp.read()
>>> rp.can_fetch("*", "http://www.musi-cal.com/cgi-bin/search?city=San+Francisco")
False
>>> rp.can_fetch("*", "http://www.musi-cal.com/")
True
...@@ -2,47 +2,47 @@ ...@@ -2,47 +2,47 @@
================================================================== ==================================================================
.. module:: urllib.error .. module:: urllib.error
:synopsis: Next generation URL opening library. :synopsis: Exception classes raised by urllib.request.
.. moduleauthor:: Jeremy Hylton <jhylton@users.sourceforge.net> .. moduleauthor:: Jeremy Hylton <jhylton@users.sourceforge.net>
.. sectionauthor:: Senthil Kumaran <orsenthil@gmail.com> .. sectionauthor:: Senthil Kumaran <orsenthil@gmail.com>
The :mod:`urllib.error` module defines exception classes raise by The :mod:`urllib.error` module defines the exception classes for exceptions
urllib.request. The base exception class is URLError, which inherits from raised by :mod:`urllib.request`. The base exception class is :exc:`URLError`,
IOError. which inherits from :exc:`IOError`.
The following exceptions are raised by :mod:`urllib.error` as appropriate: The following exceptions are raised by :mod:`urllib.error` as appropriate:
.. exception:: URLError .. exception:: URLError
The handlers raise this exception (or derived exceptions) when they run into a The handlers raise this exception (or derived exceptions) when they run into
problem. It is a subclass of :exc:`IOError`. a problem. It is a subclass of :exc:`IOError`.
.. attribute:: reason .. attribute:: reason
The reason for this error. It can be a message string or another exception The reason for this error. It can be a message string or another
instance (:exc:`socket.error` for remote URLs, :exc:`OSError` for local exception instance (:exc:`socket.error` for remote URLs, :exc:`OSError`
URLs). for local URLs).
.. exception:: HTTPError .. exception:: HTTPError
Though being an exception (a subclass of :exc:`URLError`), an :exc:`HTTPError` Though being an exception (a subclass of :exc:`URLError`), an
can also function as a non-exceptional file-like return value (the same thing :exc:`HTTPError` can also function as a non-exceptional file-like return
that :func:`urlopen` returns). This is useful when handling exotic HTTP value (the same thing that :func:`urlopen` returns). This is useful when
errors, such as requests for authentication. handling exotic HTTP errors, such as requests for authentication.
.. attribute:: code .. attribute:: code
An HTTP status code as defined in `RFC 2616 <http://www.faqs.org/rfcs/rfc2616.html>`_. An HTTP status code as defined in `RFC 2616
This numeric value corresponds to a value found in the dictionary of <http://www.faqs.org/rfcs/rfc2616.html>`_. This numeric value corresponds
codes as found in :attr:`http.server.BaseHTTPRequestHandler.responses`. to a value found in the dictionary of codes as found in
:attr:`http.server.BaseHTTPRequestHandler.responses`.
.. exception:: ContentTooShortError(msg[, content]) .. exception:: ContentTooShortError(msg[, content])
This exception is raised when the :func:`urlretrieve` function detects that the This exception is raised when the :func:`urlretrieve` function detects that
amount of the downloaded data is less than the expected amount (given by the the amount of the downloaded data is less than the expected amount (given by
*Content-Length* header). The :attr:`content` attribute stores the downloaded the *Content-Length* header). The :attr:`content` attribute stores the
(and supposedly truncated) data. downloaded (and supposedly truncated) data.
...@@ -20,13 +20,12 @@ to an absolute URL given a "base URL." ...@@ -20,13 +20,12 @@ to an absolute URL given a "base URL."
The module has been designed to match the Internet RFC on Relative Uniform The module has been designed to match the Internet RFC on Relative Uniform
Resource Locators (and discovered a bug in an earlier draft!). It supports the Resource Locators (and discovered a bug in an earlier draft!). It supports the
following URL schemes: ``file``, ``ftp``, ``gopher``, ``hdl``, ``http``, following URL schemes: ``file``, ``ftp``, ``gopher``, ``hdl``, ``http``,
``https``, ``imap``, ``mailto``, ``mms``, ``news``, ``nntp``, ``prospero``, ``https``, ``imap``, ``mailto``, ``mms``, ``news``, ``nntp``, ``prospero``,
``rsync``, ``rtsp``, ``rtspu``, ``sftp``, ``shttp``, ``sip``, ``sips``, ``rsync``, ``rtsp``, ``rtspu``, ``sftp``, ``shttp``, ``sip``, ``sips``,
``snews``, ``svn``, ``svn+ssh``, ``telnet``, ``wais``. ``snews``, ``svn``, ``svn+ssh``, ``telnet``, ``wais``.
The :mod:`urllib.parse` module defines the following functions: The :mod:`urllib.parse` module defines the following functions:
.. function:: urlparse(urlstring[, default_scheme[, allow_fragments]]) .. function:: urlparse(urlstring[, default_scheme[, allow_fragments]])
Parse a URL into six components, returning a 6-tuple. This corresponds to the Parse a URL into six components, returning a 6-tuple. This corresponds to the
...@@ -92,11 +91,11 @@ The :mod:`urllib.parse` module defines the following functions: ...@@ -92,11 +91,11 @@ The :mod:`urllib.parse` module defines the following functions:
.. function:: urlunparse(parts) .. function:: urlunparse(parts)
Construct a URL from a tuple as returned by ``urlparse()``. The *parts* argument Construct a URL from a tuple as returned by ``urlparse()``. The *parts*
can be any six-item iterable. This may result in a slightly different, but argument can be any six-item iterable. This may result in a slightly
equivalent URL, if the URL that was parsed originally had unnecessary delimiters different, but equivalent URL, if the URL that was parsed originally had
(for example, a ? with an empty query; the RFC states that these are unnecessary delimiters (for example, a ``?`` with an empty query; the RFC
equivalent). states that these are equivalent).
.. function:: urlsplit(urlstring[, default_scheme[, allow_fragments]]) .. function:: urlsplit(urlstring[, default_scheme[, allow_fragments]])
...@@ -140,19 +139,19 @@ The :mod:`urllib.parse` module defines the following functions: ...@@ -140,19 +139,19 @@ The :mod:`urllib.parse` module defines the following functions:
.. function:: urlunsplit(parts) .. function:: urlunsplit(parts)
Combine the elements of a tuple as returned by :func:`urlsplit` into a complete Combine the elements of a tuple as returned by :func:`urlsplit` into a
URL as a string. The *parts* argument can be any five-item iterable. This may complete URL as a string. The *parts* argument can be any five-item
result in a slightly different, but equivalent URL, if the URL that was parsed iterable. This may result in a slightly different, but equivalent URL, if the
originally had unnecessary delimiters (for example, a ? with an empty query; the URL that was parsed originally had unnecessary delimiters (for example, a ?
RFC states that these are equivalent). with an empty query; the RFC states that these are equivalent).
.. function:: urljoin(base, url[, allow_fragments]) .. function:: urljoin(base, url[, allow_fragments])
Construct a full ("absolute") URL by combining a "base URL" (*base*) with Construct a full ("absolute") URL by combining a "base URL" (*base*) with
another URL (*url*). Informally, this uses components of the base URL, in another URL (*url*). Informally, this uses components of the base URL, in
particular the addressing scheme, the network location and (part of) the path, particular the addressing scheme, the network location and (part of) the
to provide missing components in the relative URL. For example: path, to provide missing components in the relative URL. For example:
>>> from urllib.parse import urljoin >>> from urllib.parse import urljoin
>>> urljoin('http://www.cwi.nl/%7Eguido/Python.html', 'FAQ.html') >>> urljoin('http://www.cwi.nl/%7Eguido/Python.html', 'FAQ.html')
...@@ -178,10 +177,10 @@ The :mod:`urllib.parse` module defines the following functions: ...@@ -178,10 +177,10 @@ The :mod:`urllib.parse` module defines the following functions:
.. function:: urldefrag(url) .. function:: urldefrag(url)
If *url* contains a fragment identifier, returns a modified version of *url* If *url* contains a fragment identifier, return a modified version of *url*
with no fragment identifier, and the fragment identifier as a separate string. with no fragment identifier, and the fragment identifier as a separate
If there is no fragment identifier in *url*, returns *url* unmodified and an string. If there is no fragment identifier in *url*, return *url* unmodified
empty string. and an empty string.
.. function:: quote(string[, safe]) .. function:: quote(string[, safe])
...@@ -195,9 +194,10 @@ The :mod:`urllib.parse` module defines the following functions: ...@@ -195,9 +194,10 @@ The :mod:`urllib.parse` module defines the following functions:
.. function:: quote_plus(string[, safe]) .. function:: quote_plus(string[, safe])
Like :func:`quote`, but also replaces spaces by plus signs, as required for Like :func:`quote`, but also replace spaces by plus signs, as required for
quoting HTML form values. Plus signs in the original string are escaped unless quoting HTML form values. Plus signs in the original string are escaped
they are included in *safe*. It also does not have *safe* default to ``'/'``. unless they are included in *safe*. It also does not have *safe* default to
``'/'``.
.. function:: unquote(string) .. function:: unquote(string)
...@@ -209,7 +209,7 @@ The :mod:`urllib.parse` module defines the following functions: ...@@ -209,7 +209,7 @@ The :mod:`urllib.parse` module defines the following functions:
.. function:: unquote_plus(string) .. function:: unquote_plus(string)
Like :func:`unquote`, but also replaces plus signs by spaces, as required for Like :func:`unquote`, but also replace plus signs by spaces, as required for
unquoting HTML form values. unquoting HTML form values.
...@@ -254,7 +254,6 @@ The result objects from the :func:`urlparse` and :func:`urlsplit` functions are ...@@ -254,7 +254,6 @@ The result objects from the :func:`urlparse` and :func:`urlsplit` functions are
subclasses of the :class:`tuple` type. These subclasses add the attributes subclasses of the :class:`tuple` type. These subclasses add the attributes
described in those functions, as well as provide an additional method: described in those functions, as well as provide an additional method:
.. method:: ParseResult.geturl() .. method:: ParseResult.geturl()
Return the re-combined version of the original URL as a string. This may differ Return the re-combined version of the original URL as a string. This may differ
...@@ -279,13 +278,12 @@ described in those functions, as well as provide an additional method: ...@@ -279,13 +278,12 @@ described in those functions, as well as provide an additional method:
The following classes provide the implementations of the parse results:: The following classes provide the implementations of the parse results::
.. class:: BaseResult .. class:: BaseResult
Base class for the concrete result classes. This provides most of the attribute Base class for the concrete result classes. This provides most of the
definitions. It does not provide a :meth:`geturl` method. It is derived from attribute definitions. It does not provide a :meth:`geturl` method. It is
:class:`tuple`, but does not override the :meth:`__init__` or :meth:`__new__` derived from :class:`tuple`, but does not override the :meth:`__init__` or
methods. :meth:`__new__` methods.
.. class:: ParseResult(scheme, netloc, path, params, query, fragment) .. class:: ParseResult(scheme, netloc, path, params, query, fragment)
......
...@@ -7,9 +7,9 @@ ...@@ -7,9 +7,9 @@
.. sectionauthor:: Moshe Zadka <moshez@users.sourceforge.net> .. sectionauthor:: Moshe Zadka <moshez@users.sourceforge.net>
The :mod:`urllib.request` module defines functions and classes which help in opening The :mod:`urllib.request` module defines functions and classes which help in
URLs (mostly HTTP) in a complex world --- basic and digest authentication, opening URLs (mostly HTTP) in a complex world --- basic and digest
redirections, cookies and more. authentication, redirections, cookies and more.
The :mod:`urllib.request` module defines the following functions: The :mod:`urllib.request` module defines the following functions:
...@@ -180,7 +180,7 @@ The following classes are provided: ...@@ -180,7 +180,7 @@ The following classes are provided:
the ``User-Agent`` header, which is used by a browser to identify itself -- the ``User-Agent`` header, which is used by a browser to identify itself --
some HTTP servers only allow requests coming from common browsers as opposed some HTTP servers only allow requests coming from common browsers as opposed
to scripts. For example, Mozilla Firefox may identify itself as ``"Mozilla/5.0 to scripts. For example, Mozilla Firefox may identify itself as ``"Mozilla/5.0
(X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11"``, while :mod:`urllib2`'s (X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11"``, while :mod:`urllib`'s
default user agent string is ``"Python-urllib/2.6"`` (on Python 2.6). default user agent string is ``"Python-urllib/2.6"`` (on Python 2.6).
The final two arguments are only of interest for correct handling of third-party The final two arguments are only of interest for correct handling of third-party
...@@ -1005,10 +1005,11 @@ HTTPErrorProcessor Objects ...@@ -1005,10 +1005,11 @@ HTTPErrorProcessor Objects
For non-200 error codes, this simply passes the job on to the For non-200 error codes, this simply passes the job on to the
:meth:`protocol_error_code` handler methods, via :meth:`OpenerDirector.error`. :meth:`protocol_error_code` handler methods, via :meth:`OpenerDirector.error`.
Eventually, :class:`urllib2.HTTPDefaultErrorHandler` will raise an Eventually, :class:`HTTPDefaultErrorHandler` will raise an
:exc:`HTTPError` if no other handler handles the error. :exc:`HTTPError` if no other handler handles the error.
.. _urllib2-examples:
.. _urllib-request-examples:
Examples Examples
-------- --------
...@@ -1180,15 +1181,18 @@ The following example uses no proxies at all, overriding environment settings:: ...@@ -1180,15 +1181,18 @@ The following example uses no proxies at all, overriding environment settings::
using the :mod:`ftplib` module, subclassing :class:`FancyURLOpener`, or changing using the :mod:`ftplib` module, subclassing :class:`FancyURLOpener`, or changing
*_urlopener* to meet your needs. *_urlopener* to meet your needs.
:mod:`urllib.response` --- Response classes used by urllib. :mod:`urllib.response` --- Response classes used by urllib.
=========================================================== ===========================================================
.. module:: urllib.response .. module:: urllib.response
:synopsis: Response classes used by urllib. :synopsis: Response classes used by urllib.
The :mod:`urllib.response` module defines functions and classes which define a The :mod:`urllib.response` module defines functions and classes which define a
minimal file like interface, including read() and readline(). The typical minimal file like interface, including ``read()`` and ``readline()``. The
response object is an addinfourl instance, which defines and info() method and typical response object is an addinfourl instance, which defines and ``info()``
that returns headers and a geturl() method that returns the url. method and that returns headers and a ``geturl()`` method that returns the url.
Functions defined by this module are used internally by the Functions defined by this module are used internally by the
:mod:`urllib.request` module. :mod:`urllib.request` module.
:mod:`urllib.robotparser` --- Parser for robots.txt :mod:`urllib.robotparser` --- Parser for robots.txt
==================================================== ====================================================
.. module:: urllib.robotparser .. module:: urllib.robotparser
:synopsis: Loads a robots.txt file and answers questions about :synopsis: Load a robots.txt file and answer questions about
fetchability of other URLs. fetchability of other URLs.
.. sectionauthor:: Skip Montanaro <skip@pobox.com> .. sectionauthor:: Skip Montanaro <skip@pobox.com>
...@@ -25,42 +24,37 @@ structure of :file:`robots.txt` files, see http://www.robotstxt.org/orig.html. ...@@ -25,42 +24,37 @@ structure of :file:`robots.txt` files, see http://www.robotstxt.org/orig.html.
This class provides a set of methods to read, parse and answer questions This class provides a set of methods to read, parse and answer questions
about a single :file:`robots.txt` file. about a single :file:`robots.txt` file.
.. method:: set_url(url) .. method:: set_url(url)
Sets the URL referring to a :file:`robots.txt` file. Sets the URL referring to a :file:`robots.txt` file.
.. method:: read() .. method:: read()
Reads the :file:`robots.txt` URL and feeds it to the parser. Reads the :file:`robots.txt` URL and feeds it to the parser.
.. method:: parse(lines) .. method:: parse(lines)
Parses the lines argument. Parses the lines argument.
.. method:: can_fetch(useragent, url) .. method:: can_fetch(useragent, url)
Returns ``True`` if the *useragent* is allowed to fetch the *url* Returns ``True`` if the *useragent* is allowed to fetch the *url*
according to the rules contained in the parsed :file:`robots.txt` according to the rules contained in the parsed :file:`robots.txt`
file. file.
.. method:: mtime() .. method:: mtime()
Returns the time the ``robots.txt`` file was last fetched. This is Returns the time the ``robots.txt`` file was last fetched. This is
useful for long-running web spiders that need to check for new useful for long-running web spiders that need to check for new
``robots.txt`` files periodically. ``robots.txt`` files periodically.
.. method:: modified() .. method:: modified()
Sets the time the ``robots.txt`` file was last fetched to the current Sets the time the ``robots.txt`` file was last fetched to the current
time. time.
The following example demonstrates basic use of the RobotFileParser class. ::
The following example demonstrates basic use of the RobotFileParser class.
>>> import urllib.robotparser >>> import urllib.robotparser
>>> rp = urllib.robotparser.RobotFileParser() >>> rp = urllib.robotparser.RobotFileParser()
......
...@@ -150,8 +150,8 @@ There are a number of modules for accessing the internet and processing internet ...@@ -150,8 +150,8 @@ There are a number of modules for accessing the internet and processing internet
protocols. Two of the simplest are :mod:`urllib.request` for retrieving data protocols. Two of the simplest are :mod:`urllib.request` for retrieving data
from urls and :mod:`smtplib` for sending mail:: from urls and :mod:`smtplib` for sending mail::
>>> import urllib.request >>> from urllib.request import urlopen
>>> for line in urllib.request.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl'): >>> for line in urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl'):
... if 'EST' in line or 'EDT' in line: # look for Eastern Time ... if 'EST' in line or 'EDT' in line: # look for Eastern Time
... print(line) ... print(line)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment