1:mod:`symbol` --- Constants used with Python parse trees
2========================================================
3
4.. module:: symbol
5   :synopsis: Constants representing internal nodes of the parse tree.
6
7.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
8
9**Source code:** :source:`Lib/symbol.py`
10
11--------------
12
13This module provides constants which represent the numeric values of internal
14nodes of the parse tree.  Unlike most Python constants, these use lower-case
15names.  Refer to the file :file:`Grammar/Grammar` in the Python distribution for
16the definitions of the names in the context of the language grammar.  The
17specific numeric values which the names map to may change between Python
18versions.
19
20This module also provides one additional data object:
21
22
23.. data:: sym_name
24
25   Dictionary mapping the numeric values of the constants defined in this module
26   back to name strings, allowing more human-readable representation of parse trees
27   to be generated.
28