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Tip revision: abb88023896f545b18d20c7d0d5934b11230a12f authored by Ned Deily on 30 May 2018, 23:50:49 UTC
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symbol.rst
:mod:`symbol` --- Constants used with Python parse trees
========================================================

.. module:: symbol
   :synopsis: Constants representing internal nodes of the parse tree.

.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>

**Source code:** :source:`Lib/symbol.py`

--------------

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 :file:`Grammar/Grammar` 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.

This module also provides one additional data object:


.. data:: sym_name

   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.
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