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<h1>31.4. <tt class="xref docutils literal"><span class="pre">symbol</span></tt> — Constants used with Python parse trees<a class="headerlink" href="#module-symbol" title="Permalink to this headline">¶</a></h1>
<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="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>This module also provides one additional data object:</p>
<dl class="data">
<dt id="symbol.sym_name">
<tt class="descclassname">symbol.</tt><tt class="descname">sym_name</tt><a class="headerlink" href="#symbol.sym_name" title="Permalink to this definition">¶</a></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>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt>Module <a title="Access parse trees for Python source code." class="reference external" href="parser.html#module-parser"><tt class="xref docutils literal"><span class="pre">parser</span></tt></a></dt>
<dd>The second example for the <a title="Access parse trees for Python source code." class="reference external" href="parser.html#module-parser"><tt class="xref docutils literal"><span class="pre">parser</span></tt></a> module shows how to use the
<tt class="xref docutils literal"><span class="pre">symbol</span></tt> module.</dd>
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