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| 55 | <H1><A NAME="SECTION0020200000000000000000"> |
| 56 | 18.2 <tt class="module">symbol</tt> -- |
| 57 | Constants used with Python parse trees</A> |
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| 59 | |
| 60 | <P> |
| 61 | <A NAME="module-symbol"></A> |
| 62 | |
| 63 | <P> |
| 64 | This module provides constants which represent the numeric values of |
| 65 | internal nodes of the parse tree. Unlike most Python constants, these |
| 66 | use lower-case names. Refer to the file <span class="file">Grammar/Grammar</span> in the |
| 67 | Python distribution for the definitions of the names in the context of |
| 68 | the language grammar. The specific numeric values which the names map |
| 69 | to may change between Python versions. |
| 70 | |
| 71 | <P> |
| 72 | This module also provides one additional data object: |
| 73 | |
| 74 | <P> |
| 75 | <dl><dt><b><tt id='l2h-4959' xml:id='l2h-4959'>sym_name</tt></b></dt> |
| 76 | <dd> |
| 77 | Dictionary mapping the numeric values of the constants defined in |
| 78 | this module back to name strings, allowing more human-readable |
| 79 | representation of parse trees to be generated. |
| 80 | </dd></dl> |
| 81 | |
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| 83 | <div class="seealso"> |
| 84 | <p class="heading">See Also:</p> |
| 85 | |
| 86 | <dl compact="compact" class="seemodule"> |
| 87 | <dt>Module <b><tt class="module"><a href="module-parser.html">parser</a></tt>:</b> |
| 88 | <dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt> |
| 89 | module shows how to use the <tt class="module">symbol</tt> |
| 90 | module. |
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