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  <div class="section" id="module-token">
<span id="token-constants-used-with-python-parse-trees"></span><h1>31.5. <a class="reference internal" href="#module-token" title="token: Constants representing terminal nodes of the parse tree."><tt class="xref py py-mod docutils literal"><span class="pre">token</span></tt></a> &#8212; Constants used with Python parse trees<a class="headerlink" href="#module-token" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/2.7/Lib/token.py">Lib/token.py</a></p>
<hr class="docutils" />
<p>This module provides constants which represent the numeric values of leaf nodes
of the parse tree (terminal tokens).  Refer to the file <tt class="file docutils literal"><span class="pre">Grammar/Grammar</span></tt>
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>
<p>The module also provides a mapping from numeric codes to names and some
functions.  The functions mirror definitions in the Python C header files.</p>
<dl class="data">
<dt id="token.tok_name">
<tt class="descclassname">token.</tt><tt class="descname">tok_name</tt><a class="headerlink" href="#token.tok_name" title="Permalink to this definition">¶</a></dt>
<dd><p>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.</p>
</dd></dl>

<dl class="function">
<dt id="token.ISTERMINAL">
<tt class="descclassname">token.</tt><tt class="descname">ISTERMINAL</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#token.ISTERMINAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true for terminal token values.</p>
</dd></dl>

<dl class="function">
<dt id="token.ISNONTERMINAL">
<tt class="descclassname">token.</tt><tt class="descname">ISNONTERMINAL</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#token.ISNONTERMINAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true for non-terminal token values.</p>
</dd></dl>

<dl class="function">
<dt id="token.ISEOF">
<tt class="descclassname">token.</tt><tt class="descname">ISEOF</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#token.ISEOF" title="Permalink to this definition">¶</a></dt>
<dd><p>Return true if <em>x</em> is the marker indicating the end of input.</p>
</dd></dl>

<p>The token constants are:</p>
<dl class="data">
<dt id="token.ENDMARKER">
<tt class="descclassname">token.</tt><tt class="descname">ENDMARKER</tt><a class="headerlink" href="#token.ENDMARKER" title="Permalink to this definition">¶</a></dt>
<dt id="token.NAME">
<tt class="descclassname">token.</tt><tt class="descname">NAME</tt><a class="headerlink" href="#token.NAME" title="Permalink to this definition">¶</a></dt>
<dt id="token.NUMBER">
<tt class="descclassname">token.</tt><tt class="descname">NUMBER</tt><a class="headerlink" href="#token.NUMBER" title="Permalink to this definition">¶</a></dt>
<dt id="token.STRING">
<tt class="descclassname">token.</tt><tt class="descname">STRING</tt><a class="headerlink" href="#token.STRING" title="Permalink to this definition">¶</a></dt>
<dt id="token.NEWLINE">
<tt class="descclassname">token.</tt><tt class="descname">NEWLINE</tt><a class="headerlink" href="#token.NEWLINE" title="Permalink to this definition">¶</a></dt>
<dt id="token.INDENT">
<tt class="descclassname">token.</tt><tt class="descname">INDENT</tt><a class="headerlink" href="#token.INDENT" title="Permalink to this definition">¶</a></dt>
<dt id="token.DEDENT">
<tt class="descclassname">token.</tt><tt class="descname">DEDENT</tt><a class="headerlink" href="#token.DEDENT" title="Permalink to this definition">¶</a></dt>
<dt id="token.LPAR">
<tt class="descclassname">token.</tt><tt class="descname">LPAR</tt><a class="headerlink" href="#token.LPAR" title="Permalink to this definition">¶</a></dt>
<dt id="token.RPAR">
<tt class="descclassname">token.</tt><tt class="descname">RPAR</tt><a class="headerlink" href="#token.RPAR" title="Permalink to this definition">¶</a></dt>
<dt id="token.LSQB">
<tt class="descclassname">token.</tt><tt class="descname">LSQB</tt><a class="headerlink" href="#token.LSQB" title="Permalink to this definition">¶</a></dt>
<dt id="token.RSQB">
<tt class="descclassname">token.</tt><tt class="descname">RSQB</tt><a class="headerlink" href="#token.RSQB" title="Permalink to this definition">¶</a></dt>
<dt id="token.COLON">
<tt class="descclassname">token.</tt><tt class="descname">COLON</tt><a class="headerlink" href="#token.COLON" title="Permalink to this definition">¶</a></dt>
<dt id="token.COMMA">
<tt class="descclassname">token.</tt><tt class="descname">COMMA</tt><a class="headerlink" href="#token.COMMA" title="Permalink to this definition">¶</a></dt>
<dt id="token.SEMI">
<tt class="descclassname">token.</tt><tt class="descname">SEMI</tt><a class="headerlink" href="#token.SEMI" title="Permalink to this definition">¶</a></dt>
<dt id="token.PLUS">
<tt class="descclassname">token.</tt><tt class="descname">PLUS</tt><a class="headerlink" href="#token.PLUS" title="Permalink to this definition">¶</a></dt>
<dt id="token.MINUS">
<tt class="descclassname">token.</tt><tt class="descname">MINUS</tt><a class="headerlink" href="#token.MINUS" title="Permalink to this definition">¶</a></dt>
<dt id="token.STAR">
<tt class="descclassname">token.</tt><tt class="descname">STAR</tt><a class="headerlink" href="#token.STAR" title="Permalink to this definition">¶</a></dt>
<dt id="token.SLASH">
<tt class="descclassname">token.</tt><tt class="descname">SLASH</tt><a class="headerlink" href="#token.SLASH" title="Permalink to this definition">¶</a></dt>
<dt id="token.VBAR">
<tt class="descclassname">token.</tt><tt class="descname">VBAR</tt><a class="headerlink" href="#token.VBAR" title="Permalink to this definition">¶</a></dt>
<dt id="token.AMPER">
<tt class="descclassname">token.</tt><tt class="descname">AMPER</tt><a class="headerlink" href="#token.AMPER" title="Permalink to this definition">¶</a></dt>
<dt id="token.LESS">
<tt class="descclassname">token.</tt><tt class="descname">LESS</tt><a class="headerlink" href="#token.LESS" title="Permalink to this definition">¶</a></dt>
<dt id="token.GREATER">
<tt class="descclassname">token.</tt><tt class="descname">GREATER</tt><a class="headerlink" href="#token.GREATER" title="Permalink to this definition">¶</a></dt>
<dt id="token.EQUAL">
<tt class="descclassname">token.</tt><tt class="descname">EQUAL</tt><a class="headerlink" href="#token.EQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.DOT">
<tt class="descclassname">token.</tt><tt class="descname">DOT</tt><a class="headerlink" href="#token.DOT" title="Permalink to this definition">¶</a></dt>
<dt id="token.PERCENT">
<tt class="descclassname">token.</tt><tt class="descname">PERCENT</tt><a class="headerlink" href="#token.PERCENT" title="Permalink to this definition">¶</a></dt>
<dt id="token.BACKQUOTE">
<tt class="descclassname">token.</tt><tt class="descname">BACKQUOTE</tt><a class="headerlink" href="#token.BACKQUOTE" title="Permalink to this definition">¶</a></dt>
<dt id="token.LBRACE">
<tt class="descclassname">token.</tt><tt class="descname">LBRACE</tt><a class="headerlink" href="#token.LBRACE" title="Permalink to this definition">¶</a></dt>
<dt id="token.RBRACE">
<tt class="descclassname">token.</tt><tt class="descname">RBRACE</tt><a class="headerlink" href="#token.RBRACE" title="Permalink to this definition">¶</a></dt>
<dt id="token.EQEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">EQEQUAL</tt><a class="headerlink" href="#token.EQEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.NOTEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">NOTEQUAL</tt><a class="headerlink" href="#token.NOTEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.LESSEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">LESSEQUAL</tt><a class="headerlink" href="#token.LESSEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.GREATEREQUAL">
<tt class="descclassname">token.</tt><tt class="descname">GREATEREQUAL</tt><a class="headerlink" href="#token.GREATEREQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.TILDE">
<tt class="descclassname">token.</tt><tt class="descname">TILDE</tt><a class="headerlink" href="#token.TILDE" title="Permalink to this definition">¶</a></dt>
<dt id="token.CIRCUMFLEX">
<tt class="descclassname">token.</tt><tt class="descname">CIRCUMFLEX</tt><a class="headerlink" href="#token.CIRCUMFLEX" title="Permalink to this definition">¶</a></dt>
<dt id="token.LEFTSHIFT">
<tt class="descclassname">token.</tt><tt class="descname">LEFTSHIFT</tt><a class="headerlink" href="#token.LEFTSHIFT" title="Permalink to this definition">¶</a></dt>
<dt id="token.RIGHTSHIFT">
<tt class="descclassname">token.</tt><tt class="descname">RIGHTSHIFT</tt><a class="headerlink" href="#token.RIGHTSHIFT" title="Permalink to this definition">¶</a></dt>
<dt id="token.DOUBLESTAR">
<tt class="descclassname">token.</tt><tt class="descname">DOUBLESTAR</tt><a class="headerlink" href="#token.DOUBLESTAR" title="Permalink to this definition">¶</a></dt>
<dt id="token.PLUSEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">PLUSEQUAL</tt><a class="headerlink" href="#token.PLUSEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.MINEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">MINEQUAL</tt><a class="headerlink" href="#token.MINEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.STAREQUAL">
<tt class="descclassname">token.</tt><tt class="descname">STAREQUAL</tt><a class="headerlink" href="#token.STAREQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.SLASHEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">SLASHEQUAL</tt><a class="headerlink" href="#token.SLASHEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.PERCENTEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">PERCENTEQUAL</tt><a class="headerlink" href="#token.PERCENTEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.AMPEREQUAL">
<tt class="descclassname">token.</tt><tt class="descname">AMPEREQUAL</tt><a class="headerlink" href="#token.AMPEREQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.VBAREQUAL">
<tt class="descclassname">token.</tt><tt class="descname">VBAREQUAL</tt><a class="headerlink" href="#token.VBAREQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.CIRCUMFLEXEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">CIRCUMFLEXEQUAL</tt><a class="headerlink" href="#token.CIRCUMFLEXEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.LEFTSHIFTEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">LEFTSHIFTEQUAL</tt><a class="headerlink" href="#token.LEFTSHIFTEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.RIGHTSHIFTEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">RIGHTSHIFTEQUAL</tt><a class="headerlink" href="#token.RIGHTSHIFTEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.DOUBLESTAREQUAL">
<tt class="descclassname">token.</tt><tt class="descname">DOUBLESTAREQUAL</tt><a class="headerlink" href="#token.DOUBLESTAREQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.DOUBLESLASH">
<tt class="descclassname">token.</tt><tt class="descname">DOUBLESLASH</tt><a class="headerlink" href="#token.DOUBLESLASH" title="Permalink to this definition">¶</a></dt>
<dt id="token.DOUBLESLASHEQUAL">
<tt class="descclassname">token.</tt><tt class="descname">DOUBLESLASHEQUAL</tt><a class="headerlink" href="#token.DOUBLESLASHEQUAL" title="Permalink to this definition">¶</a></dt>
<dt id="token.AT">
<tt class="descclassname">token.</tt><tt class="descname">AT</tt><a class="headerlink" href="#token.AT" title="Permalink to this definition">¶</a></dt>
<dt id="token.OP">
<tt class="descclassname">token.</tt><tt class="descname">OP</tt><a class="headerlink" href="#token.OP" title="Permalink to this definition">¶</a></dt>
<dt id="token.ERRORTOKEN">
<tt class="descclassname">token.</tt><tt class="descname">ERRORTOKEN</tt><a class="headerlink" href="#token.ERRORTOKEN" title="Permalink to this definition">¶</a></dt>
<dt id="token.N_TOKENS">
<tt class="descclassname">token.</tt><tt class="descname">N_TOKENS</tt><a class="headerlink" href="#token.N_TOKENS" title="Permalink to this definition">¶</a></dt>
<dt id="token.NT_OFFSET">
<tt class="descclassname">token.</tt><tt class="descname">NT_OFFSET</tt><a class="headerlink" href="#token.NT_OFFSET" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>

<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt>Module <a class="reference internal" href="parser.html#module-parser" title="parser: Access parse trees for Python source code."><tt class="xref py py-mod docutils literal"><span class="pre">parser</span></tt></a></dt>
<dd>The second example for the <a class="reference internal" href="parser.html#module-parser" title="parser: Access parse trees for Python source code."><tt class="xref py py-mod docutils literal"><span class="pre">parser</span></tt></a> module shows how to use the
<a class="reference internal" href="symbol.html#module-symbol" title="symbol: Constants representing internal nodes of the parse tree."><tt class="xref py py-mod docutils literal"><span class="pre">symbol</span></tt></a> module.</dd>
</dl>
</div>
</div>


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