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69 lines
2.1 KiB
TeX
69 lines
2.1 KiB
TeX
\section{\module{robotparser} ---
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Parser for robots.txt}
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\declaremodule{standard}{robotparser}
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\modulesynopsis{Accepts as input a list of lines or URL that refers to a
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robots.txt file, parses the file, then builds a
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set of rules from that list and answers questions
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about fetchability of other URLs.}
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\sectionauthor{Skip Montanaro}{skip@mojam.com}
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\index{WWW}
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\index{World-Wide Web}
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\index{URL}
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\index{robots.txt}
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This module provides a single class, \class{RobotFileParser}, which answers
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questions about whether or not a particular user agent can fetch a URL on
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the web site that published the \file{robots.txt} file. For more details on
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the structure of \file{robots.txt} files, see
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\url{http://info.webcrawler.com/mak/projects/robots/norobots.html}.
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\begin{classdesc}{RobotFileParser}{}
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This class provides a set of methods to read, parse and answer questions
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about a single \file{robots.txt} file.
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\begin{methoddesc}{set_url}{url}
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Sets the URL referring to a \file{robots.txt} file.
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\end{methoddesc}
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\begin{methoddesc}{read}{}
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Reads the \file{robots.txt} URL and feeds it to the parser.
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\end{methoddesc}
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\begin{methoddesc}{parse}{lines}
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Parses the lines argument.
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\end{methoddesc}
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\begin{methoddesc}{can_fetch}{useragent, url}
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Returns true if the \var{useragent} is allowed to fetch the \var{url}
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according to the rules contained in the parsed \file{robots.txt} file.
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\end{methoddesc}
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\begin{methoddesc}{mtime}{}
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Returns the time the \code{robots.txt} file was last fetched. This is
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useful for long-running web spiders that need to check for new
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\code{robots.txt} files periodically.
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\end{methoddesc}
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\begin{methoddesc}{modified}{}
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Sets the time the \code{robots.txt} file was last fetched to the current
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time.
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\end{methoddesc}
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\end{classdesc}
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The following example demonstrates basic use of the RobotFileParser class.
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\begin{verbatim}
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>>> import robotparser
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>>> rp = robotparser.RobotFileParser()
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>>> rp.set_url("http://www.musi-cal.com/robots.txt")
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>>> rp.read()
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>>> rp.can_fetch("*", "http://www.musi-cal.com/cgi-bin/search?city=San+Francisco")
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0
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>>> rp.can_fetch("*", "http://www.musi-cal.com/")
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1
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\end{verbatim}
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