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<H1><A NAME="SECTION0020300000000000000000">
18.3 <tt class="module">token</tt> --
         Constants used with Python parse trees</A>
</H1>

<P>
<A NAME="module-token"></A>

<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><tt id='l2h-4961' xml:id='l2h-4961'>tok_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>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4962' xml:id='l2h-4962' class="function">ISTERMINAL</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true for terminal token values.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4963' xml:id='l2h-4963' class="function">ISNONTERMINAL</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true for non-terminal token values.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4964' xml:id='l2h-4964' class="function">ISEOF</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true if <var>x</var> is the marker indicating the end of input.
</dl>

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

  <dl compact="compact" class="seemodule">
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    <dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt>
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	54
	55	<H1><A NAME="SECTION0020300000000000000000">
	56	18.3 <tt class="module">token</tt> --
	57	Constants used with Python parse trees</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-token"></A>
	62
	63	<P>
	64	This module provides constants which represent the numeric values of
65	leaf nodes of the parse tree (terminal tokens). Refer to the file
66	<span class="file">Grammar/Grammar</span> in the Python distribution for the definitions
67	of the names in the context of the language grammar. The specific
68	numeric values which the names map to may change between Python
69	versions.
70
71	<P>
72	This module also provides one data object and some functions. The
73	functions mirror definitions in the Python C header files.
74
75	<P>
76	<dl><dt><b><tt id='l2h-4961' xml:id='l2h-4961'>tok_name</tt></b></dt>
77	<dd>
78	Dictionary mapping the numeric values of the constants defined in this
79	module back to name strings, allowing more human-readable
80	representation of parse trees to be generated.
81	</dd></dl>
82
83	<P>
84	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
85	<td><nobr><b><tt id='l2h-4962' xml:id='l2h-4962' class="function">ISTERMINAL</tt></b>(</nobr></td>
86	<td><var>x</var>)</td></tr></table></dt>
87	<dd>
88	Return true for terminal token values.
89	</dl>
90
91	<P>
92	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
93	<td><nobr><b><tt id='l2h-4963' xml:id='l2h-4963' class="function">ISNONTERMINAL</tt></b>(</nobr></td>
94	<td><var>x</var>)</td></tr></table></dt>
95	<dd>
96	Return true for non-terminal token values.
97	</dl>
98
99	<P>
100	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
101	<td><nobr><b><tt id='l2h-4964' xml:id='l2h-4964' class="function">ISEOF</tt></b>(</nobr></td>
102	<td><var>x</var>)</td></tr></table></dt>
103	<dd>
104	Return true if <var>x</var> is the marker indicating the end of input.
105	</dl>
106
107	<P>
108	<div class="seealso">
109	<p class="heading">See Also:</p>
110
111	<dl compact="compact" class="seemodule">
112	<dt>Module <b><tt class="module"><a href="module-parser.html">parser</a></tt>:</b>
113	<dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt>
114	module shows how to use the <tt class="module">symbol</tt>
115	module.
116	</dl>
117	</div>
118
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