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Constants used with Python parse trees</TITLE>
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<H1><A NAME="SECTION0051500000000000000000">
3.15 <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 <tt class=file>Grammar/Grammar</tt> in the
Python distribution for the defintions 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-500"><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>

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<div class=seealso>
  <p class=heading><b>See Also:</b></p>

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<p>Module <b><tt class=module><a href="module-parser.html">parser</a></tt></b>&nbsp;&nbsp;&nbsp;(second example uses this module)</p>
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