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34 lines
1.1 KiB
ReStructuredText
34 lines
1.1 KiB
ReStructuredText
:mod:`symbol` --- Constants used with Python parse trees
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========================================================
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.. module:: symbol
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:synopsis: Constants representing internal nodes of the parse tree.
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.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
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**Source code:** :source:`Lib/symbol.py`
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--------------
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This module provides constants which represent the numeric values of internal
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nodes of the parse tree. Unlike most Python constants, these use lower-case
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names. Refer to the file :file:`Grammar/Grammar` in the Python distribution for
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the definitions of the names in the context of the language grammar. The
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specific numeric values which the names map to may change between Python
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versions.
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This module also provides one additional data object:
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.. data:: sym_name
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Dictionary mapping the numeric values of the constants defined in this module
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back to name strings, allowing more human-readable representation of parse trees
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to be generated.
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.. seealso::
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Module :mod:`parser`
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The second example for the :mod:`parser` module shows how to use the
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:mod:`symbol` module.
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