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<title>18.2 symbol -- Constants used with Python parse trees</title>
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<H1><A NAME="SECTION0020200000000000000000">
18.2 <tt class="module">symbol</tt> --
Constants used with Python parse trees</A>
</H1>
<P>
<A NAME="module-symbol"></A>
<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><tt id='l2h-4959' xml:id='l2h-4959'>sym_name</tt></b></dt>
<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.
</dd></dl>
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<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.
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<span class="release-info">Release 2.4.3, documentation updated on 29 March 2006.</span>
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