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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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  <p class="heading">See Also:</p>

  <dl compact="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>
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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