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