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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>31.5. token — Constants used with Python parse trees — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="31. 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Python Language Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <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> — 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> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="symbol.html" title="previous 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