<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>18.2 symbol -- Constants used with Python parse trees</title> <META NAME="description" CONTENT="18.2 symbol -- Constants used with Python parse trees"> <META NAME="keywords" CONTENT="lib"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <meta http-equiv="Content-Type" content="text/html; charset="> <link rel="STYLESHEET" href="lib.css"> <link rel="first" href="lib.html"> <link rel="contents" href="contents.html" title="Contents"> <link rel="index" href="genindex.html" title="Index"> <LINK REL="next" href="module-token.html"> <LINK REL="previous" href="module-parser.html"> <LINK REL="up" href="language.html"> <LINK REL="next" href="module-token.html"> </head> <body> <DIV CLASS="navigation"> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><A HREF="node558.html"><img src="../icons/previous.gif" border="0" height="32" alt="Previous Page" width="32"></A></td> <td><A href="language.html"><img src="../icons/up.gif" border="0" height="32" alt="Up One Level" width="32"></A></td> <td><A href="module-token.html"><img src="../icons/next.gif" border="0" height="32" alt="Next Page" width="32"></A></td> <td align="center" width="100%">Python Library Reference</td> <td><A href="contents.html"><img src="../icons/contents.gif" border="0" height="32" alt="Contents" width="32"></A></td> <td><a href="modindex.html" title="Module Index"><img src="../icons/modules.gif" border="0" height="32" alt="Module Index" width="32"></a></td> <td><A href="genindex.html"><img src="../icons/index.gif" border="0" height="32" alt="Index" width="32"></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" HREF="node558.html">18.1.6.2 Information Discovery</A> <b class="navlabel">Up:</b> <a class="sectref" href="language.html">18. Python Language Services</A> <b class="navlabel">Next:</b> <a class="sectref" href="module-token.html">18.3 token </A> <br><hr> </DIV> <!--End of Navigation Panel--> <H1><A NAME="SECTION0020200000000000000000"> 18.2 <tt class="module">symbol</tt> -- Constants used with Python parse trees</A> </H1> <P> <P> This module provides constants which represent the numeric values of internal nodes of the parse tree. Unlike most Python constants, these use lower-case names. Refer to the file <span class="file">Grammar/Grammar</span> in the Python distribution for the definitions of the names in the context of the language grammar. The specific numeric values which the names map to may change between Python versions. <P> This module also provides one additional data object: <P> <dl><dt><b><a name="l2h-3788"><tt>sym_name</tt></a></b> <dd> Dictionary mapping the numeric values of the constants defined in this module back to name strings, allowing more human-readable representation of parse trees to be generated. </dl> <P> <div class="seealso"> <p class="heading"><b>See Also:</b></p> <dl compact class="seemodule"> <dt>Module <b><tt class="module"><a href="module-parser.html">parser</a></tt>:</b> <dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt> module shows how to use the <tt class="module">symbol</tt> module. </dl> </div> <DIV CLASS="navigation"> <p><hr> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><A HREF="node558.html"><img src="../icons/previous.gif" border="0" height="32" alt="Previous Page" width="32"></A></td> <td><A href="language.html"><img src="../icons/up.gif" border="0" height="32" alt="Up One Level" width="32"></A></td> <td><A href="module-token.html"><img src="../icons/next.gif" border="0" height="32" alt="Next Page" width="32"></A></td> <td align="center" width="100%">Python Library Reference</td> <td><A href="contents.html"><img src="../icons/contents.gif" border="0" height="32" alt="Contents" width="32"></A></td> <td><a href="modindex.html" title="Module Index"><img src="../icons/modules.gif" border="0" height="32" alt="Module Index" width="32"></a></td> <td><A href="genindex.html"><img src="../icons/index.gif" border="0" height="32" alt="Index" width="32"></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" HREF="node558.html">18.1.6.2 Information Discovery</A> <b class="navlabel">Up:</b> <a class="sectref" href="language.html">18. Python Language Services</A> <b class="navlabel">Next:</b> <a class="sectref" href="module-token.html">18.3 token </A> <hr> <span class="release-info">Release 2.2, documentation updated on December 21, 2001.</span> </DIV> <!--End of Navigation Panel--> <ADDRESS> See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. </ADDRESS> </BODY> </HTML>