cpython/Doc/library/token.rst

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:mod:`token` --- Constants used with Python parse trees
=======================================================
.. module:: token
:synopsis: Constants representing terminal nodes of the parse tree.
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
This module provides constants which represent the numeric values of leaf nodes
of the parse tree (terminal tokens). 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.
Merged revisions 85548,85572-85573,85606,85609-85612,85614-85616 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r85548 | georg.brandl | 2010-10-15 21:46:19 +0200 (Fr, 15 Okt 2010) | 1 line #10072: assume a bit less knowledge of the FTP protocol in the ftplib docs. ........ r85572 | georg.brandl | 2010-10-16 20:51:05 +0200 (Sa, 16 Okt 2010) | 1 line #10122: typo fix. ........ r85573 | georg.brandl | 2010-10-16 20:53:08 +0200 (Sa, 16 Okt 2010) | 1 line #10124: typo fix. ........ r85606 | georg.brandl | 2010-10-17 08:32:59 +0200 (So, 17 Okt 2010) | 1 line #10058: tweak wording about exception returns. ........ r85609 | georg.brandl | 2010-10-17 11:19:03 +0200 (So, 17 Okt 2010) | 1 line #8556: use less confusing mapping key in example. ........ r85610 | georg.brandl | 2010-10-17 11:23:05 +0200 (So, 17 Okt 2010) | 1 line #8686: remove potentially confusing wording that does not add any value. ........ r85611 | georg.brandl | 2010-10-17 11:33:24 +0200 (So, 17 Okt 2010) | 1 line #8811: small fixes to sqlite3 docs. ........ r85612 | georg.brandl | 2010-10-17 11:37:54 +0200 (So, 17 Okt 2010) | 1 line #8855: add shelve security warning. ........ r85614 | georg.brandl | 2010-10-17 11:46:11 +0200 (So, 17 Okt 2010) | 1 line #8968: add actual name of token constants. ........ r85615 | georg.brandl | 2010-10-17 12:05:13 +0200 (So, 17 Okt 2010) | 1 line #459007: merge info from PC/getpathp.c and using/windows.rst to document the forming of sys.path under Windows. ........ r85616 | georg.brandl | 2010-10-17 12:07:29 +0200 (So, 17 Okt 2010) | 1 line Fix copy-paste error in example. ........
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The module also provides a mapping from numeric codes to names and some
functions. The functions mirror definitions in the Python C header files.
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.. data:: tok_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.
.. function:: ISTERMINAL(x)
Return true for terminal token values.
.. function:: ISNONTERMINAL(x)
Return true for non-terminal token values.
.. function:: ISEOF(x)
Return true if *x* is the marker indicating the end of input.
Merged revisions 85548,85572-85573,85606,85609-85612,85614-85616 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r85548 | georg.brandl | 2010-10-15 21:46:19 +0200 (Fr, 15 Okt 2010) | 1 line #10072: assume a bit less knowledge of the FTP protocol in the ftplib docs. ........ r85572 | georg.brandl | 2010-10-16 20:51:05 +0200 (Sa, 16 Okt 2010) | 1 line #10122: typo fix. ........ r85573 | georg.brandl | 2010-10-16 20:53:08 +0200 (Sa, 16 Okt 2010) | 1 line #10124: typo fix. ........ r85606 | georg.brandl | 2010-10-17 08:32:59 +0200 (So, 17 Okt 2010) | 1 line #10058: tweak wording about exception returns. ........ r85609 | georg.brandl | 2010-10-17 11:19:03 +0200 (So, 17 Okt 2010) | 1 line #8556: use less confusing mapping key in example. ........ r85610 | georg.brandl | 2010-10-17 11:23:05 +0200 (So, 17 Okt 2010) | 1 line #8686: remove potentially confusing wording that does not add any value. ........ r85611 | georg.brandl | 2010-10-17 11:33:24 +0200 (So, 17 Okt 2010) | 1 line #8811: small fixes to sqlite3 docs. ........ r85612 | georg.brandl | 2010-10-17 11:37:54 +0200 (So, 17 Okt 2010) | 1 line #8855: add shelve security warning. ........ r85614 | georg.brandl | 2010-10-17 11:46:11 +0200 (So, 17 Okt 2010) | 1 line #8968: add actual name of token constants. ........ r85615 | georg.brandl | 2010-10-17 12:05:13 +0200 (So, 17 Okt 2010) | 1 line #459007: merge info from PC/getpathp.c and using/windows.rst to document the forming of sys.path under Windows. ........ r85616 | georg.brandl | 2010-10-17 12:07:29 +0200 (So, 17 Okt 2010) | 1 line Fix copy-paste error in example. ........
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The token constants are:
.. data:: ENDMARKER
NAME
NUMBER
STRING
NEWLINE
INDENT
DEDENT
LPAR
RPAR
LSQB
RSQB
COLON
COMMA
SEMI
PLUS
MINUS
STAR
SLASH
VBAR
AMPER
LESS
GREATER
EQUAL
DOT
PERCENT
BACKQUOTE
LBRACE
RBRACE
EQEQUAL
NOTEQUAL
LESSEQUAL
GREATEREQUAL
TILDE
CIRCUMFLEX
LEFTSHIFT
RIGHTSHIFT
DOUBLESTAR
PLUSEQUAL
MINEQUAL
STAREQUAL
SLASHEQUAL
PERCENTEQUAL
AMPEREQUAL
VBAREQUAL
CIRCUMFLEXEQUAL
LEFTSHIFTEQUAL
RIGHTSHIFTEQUAL
DOUBLESTAREQUAL
DOUBLESLASH
DOUBLESLASHEQUAL
AT
OP
ERRORTOKEN
N_TOKENS
NT_OFFSET
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.. seealso::
Module :mod:`parser`
The second example for the :mod:`parser` module shows how to use the
:mod:`symbol` module.