mirror of
https://github.com/python/cpython.git
synced 2024-11-25 10:54:51 +08:00
72 lines
2.0 KiB
ReStructuredText
72 lines
2.0 KiB
ReStructuredText
|
|
: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@mojam.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/wc/norobots.html.
|
|
|
|
|
|
.. class:: RobotFileParser()
|
|
|
|
This class provides a set of methods to read, parse and answer questions about a
|
|
single :file:`robots.txt` file.
|
|
|
|
|
|
.. method:: RobotFileParser.set_url(url)
|
|
|
|
Sets the URL referring to a :file:`robots.txt` file.
|
|
|
|
|
|
.. method:: RobotFileParser.read()
|
|
|
|
Reads the :file:`robots.txt` URL and feeds it to the parser.
|
|
|
|
|
|
.. method:: RobotFileParser.parse(lines)
|
|
|
|
Parses the lines argument.
|
|
|
|
|
|
.. method:: RobotFileParser.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:: RobotFileParser.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:: RobotFileParser.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
|
|
|