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\chapter{WORLD-WIDE WEB EXTENSIONS}
\index{WWW}
\indexii{World-Wide}{Web}
The modules described in this chapter provide various services to
World-Wide Web (WWW) clients and/or services, and a few modules
related to news and email. They are all implemented in Python. Some
of these modules require the presence of the system-dependent module
\code{sockets}, which is currently only fully supported on Unix and
Windows NT. Here is an overview:
\begin{description}
\item[urllib]
--- Open an arbitrary object given by URL (requires sockets).
\item[httplib]
--- HTTP protocol client (requires sockets).
\item[ftplib]
--- FTP protocol client (requires sockets).
\item[gopherlib]
--- Gopher protocol client (requires sockets).
\item[nntplib]
--- NNTP protocol client (requires sockets).
\item[urlparse]
--- Parse a URL string into a tuple (addressing scheme identifier, network
location, path, parameters, query string, fragment identifier).
\item[htmllib]
--- A (slow) parser for HTML files.
\item[sgmllib]
--- Only as much of an SGML parser as needed to parse HTML.
\item[rfc822]
--- Parse RFC-822 style mail headers.
\item[mimetools]
--- Tools for parsing MIME style message bodies.
\end{description}
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