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<H1><A NAME="SECTION0019300000000000000000">
17.3 <tt class="module">token</tt> --
Constants used with Python parse trees</A>
</H1>
<P>
<P>
This module provides constants which represent the numeric values of
leaf nodes of the parse tree (terminal tokens). 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 data object and some functions. The
functions mirror definitions in the Python C header files.
<P>
<dl><dt><b><a name='l2h-3035'><tt>tok_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>
<dl><dt><b><a name='l2h-3036'><tt class='function'>ISTERMINAL</tt></a></b> (<var>x</var>)
<dd>
Return true for terminal token values.
</dl>
<P>
<dl><dt><b><a name='l2h-3037'><tt class='function'>ISNONTERMINAL</tt></a></b> (<var>x</var>)
<dd>
Return true for non-terminal token values.
</dl>
<P>
<dl><dt><b><a name='l2h-3038'><tt class='function'>ISEOF</tt></a></b> (<var>x</var>)
<dd>
Return true if <var>x</var> is the marker indicating the end of input.
</dl>
<P>
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<p class='heading'><b>See Also:</b></p>
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<dt>Module <b><tt class='module'><a href="module-parser.html" tppabs="http://www.python.org/doc/current/lib/module-parser.html">parser</a></tt>:</b>
<dd>second example uses this module.
</dl>
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