2007-08-15 14:28:22 +00:00
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:mod:`token` --- Constants used with Python parse trees
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=======================================================
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.. module:: token
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:synopsis: Constants representing terminal nodes of the parse tree.
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.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
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2011-01-27 01:20:32 +00:00
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**Source code:** :source:`Lib/token.py`
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--------------
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2007-08-15 14:28:22 +00:00
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This module provides constants which represent the numeric values of leaf nodes
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of the parse tree (terminal tokens). Refer to the file :file:`Grammar/Grammar`
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in the Python distribution for the definitions of the names in the context of
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the language grammar. The specific numeric values which the names map to may
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change between Python versions.
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2010-10-17 09:46:11 +00:00
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The module also provides a mapping from numeric codes to names and some
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functions. The functions mirror definitions in the Python C header files.
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2007-08-15 14:28:22 +00:00
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.. data:: tok_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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.. function:: ISTERMINAL(x)
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Return true for terminal token values.
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.. function:: ISNONTERMINAL(x)
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Return true for non-terminal token values.
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.. function:: ISEOF(x)
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Return true if *x* is the marker indicating the end of input.
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2010-10-17 09:46:11 +00:00
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The token constants are:
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.. data:: ENDMARKER
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NAME
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NUMBER
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STRING
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NEWLINE
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INDENT
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DEDENT
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LPAR
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RPAR
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LSQB
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RSQB
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COLON
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COMMA
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SEMI
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PLUS
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MINUS
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STAR
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SLASH
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VBAR
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AMPER
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LESS
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GREATER
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EQUAL
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DOT
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PERCENT
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BACKQUOTE
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LBRACE
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RBRACE
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EQEQUAL
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NOTEQUAL
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LESSEQUAL
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GREATEREQUAL
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TILDE
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CIRCUMFLEX
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LEFTSHIFT
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RIGHTSHIFT
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DOUBLESTAR
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PLUSEQUAL
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MINEQUAL
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STAREQUAL
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SLASHEQUAL
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PERCENTEQUAL
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AMPEREQUAL
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VBAREQUAL
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CIRCUMFLEXEQUAL
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LEFTSHIFTEQUAL
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RIGHTSHIFTEQUAL
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DOUBLESTAREQUAL
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DOUBLESLASH
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DOUBLESLASHEQUAL
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AT
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OP
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ERRORTOKEN
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N_TOKENS
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NT_OFFSET
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2007-08-15 14:28:22 +00:00
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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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