12.19 robotparser -- Parser for robots.txt

Python 2.2

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12.19 `robotparser` -- Parser for robots.txt

This module provides a single class, RobotFileParser, which answers questions about whether or not a particular user agent can fetch a URL on the Web site that published the robots.txt file. For more details on the structure of 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 robots.txt file.

set_url( url): Sets the URL referring to a robots.txt file.

read( ): Reads the robots.txt URL and feeds it to the parser.

parse( lines): Parses the lines argument.

can_fetch( useragent, url): Returns True if the useragent is allowed to fetch the url according to the rules contained in the parsed robots.txt file.

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.

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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