mirror of
https://github.com/python/cpython.git
synced 2025-10-31 10:26:02 +00:00
66 lines
2 KiB
TeX
66 lines
2 KiB
TeX
\section{\module{robotparser} ---
|
|
Parser for robots.txt}
|
|
|
|
\declaremodule{standard}{robotparser}
|
|
\modulesynopsis{Loads a \protect\file{robots.txt} file and
|
|
answers questions about fetchability of other URLs.}
|
|
\sectionauthor{Skip Montanaro}{skip@mojam.com}
|
|
|
|
\index{WWW}
|
|
\index{World Wide Web}
|
|
\index{URL}
|
|
\index{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
|
|
\url{http://www.robotstxt.org/wc/norobots.html}.
|
|
|
|
\begin{classdesc}{RobotFileParser}{}
|
|
|
|
This class provides a set of methods to read, parse and answer questions
|
|
about a single \file{robots.txt} file.
|
|
|
|
\begin{methoddesc}{set_url}{url}
|
|
Sets the URL referring to a \file{robots.txt} file.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read}{}
|
|
Reads the \file{robots.txt} URL and feeds it to the parser.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{parse}{lines}
|
|
Parses the lines argument.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{can_fetch}{useragent, url}
|
|
Returns \code{True} if the \var{useragent} is allowed to fetch the \var{url}
|
|
according to the rules contained in the parsed \file{robots.txt} file.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{mtime}{}
|
|
Returns the time the \code{robots.txt} file was last fetched. This is
|
|
useful for long-running web spiders that need to check for new
|
|
\code{robots.txt} files periodically.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{modified}{}
|
|
Sets the time the \code{robots.txt} file was last fetched to the current
|
|
time.
|
|
\end{methoddesc}
|
|
|
|
\end{classdesc}
|
|
|
|
The following example demonstrates basic use of the RobotFileParser class.
|
|
|
|
\begin{verbatim}
|
|
>>> 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
|
|
\end{verbatim}
|