: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 :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

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