A robot exclusion rules parser for Python by Philip Semanchuk
Full documentation, examples and a comparison to Python's robotparser module
reside here:
http://NikitaTheSpider.com/python/rerp/
Comments, bug reports, etc. are most welcome via email to:
philip@semanchuk.com
Simple usage examples:
import robotexclusionrulesparser
rerp = robotexclusionrulesparser.RobotExclusionRulesParser()
try:
rerp.fetch('http://www.example.com/robots.txt')
except:
# See the documentation for expected errors
pass
if rerp.is_allowed('CrunchyFrogBot', '/foo.html'):
print "It is OK to fetch /foo.html"
OR supply the contents of robots.txt yourself:
rerp = RobotExclusionRulesParser()
s = open("robots.txt").read()
rerp.parse(s)
if rerp.is_allowed('CrunchyFrogBot', '/foo.html'):
print "It is OK to fetch /foo.html"
The function is_expired() tells you if you need to fetch a fresh copy of
this robots.txt.
if rerp.is_expired():
# Get a new copy
pass
RobotExclusionRulesParser supports __unicode__() and __str()__ so you can print
an instance to see the its rules in robots.txt format.
The comments refer to MK1994, MK1996 and GYM2008. These are:
MK1994 = the 1994 robots.txt draft spec (http://www.robotstxt.org/orig.html)
MK1996 = the 1996 robots.txt draft spec (http://www.robotstxt.org/norobots-rfc.txt)
GYM2008 = the Google-Yahoo-Microsoft extensions announced in 2008
(http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=40360)
This code is released under the following BSD license --
Copyright (c) 2010, Philip Semanchuk
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of robotexclusionrulesparser nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY ITS CONTRIBUTORS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL Philip Semanchuk BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
