31.5. token — Constants used with Python parse trees
Source code: Lib/token.py
This module provides constants which represent the numeric values of leaf nodes
of the parse tree (terminal tokens). Refer to the 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.
The module also provides a mapping from numeric codes to names and some
functions. The functions mirror definitions in the Python C header files.
-
token.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.
-
token.ISTERMINAL(x)
Return true for terminal token values.
-
token.ISNONTERMINAL(x)
Return true for non-terminal token values.
-
token.ISEOF(x)
Return true if x is the marker indicating the end of input.
The token constants are:
-
token.ENDMARKER
-
token.NAME
-
token.NUMBER
-
token.STRING
-
token.NEWLINE
-
token.INDENT
-
token.DEDENT
-
token.LPAR
-
token.RPAR
-
token.LSQB
-
token.RSQB
-
token.COLON
-
token.COMMA
-
token.SEMI
-
token.PLUS
-
token.MINUS
-
token.STAR
-
token.SLASH
-
token.VBAR
-
token.AMPER
-
token.LESS
-
token.GREATER
-
token.EQUAL
-
token.DOT
-
token.PERCENT
-
token.BACKQUOTE
-
token.LBRACE
-
token.RBRACE
-
token.EQEQUAL
-
token.NOTEQUAL
-
token.LESSEQUAL
-
token.GREATEREQUAL
-
token.TILDE
-
token.CIRCUMFLEX
-
token.LEFTSHIFT
-
token.RIGHTSHIFT
-
token.DOUBLESTAR
-
token.PLUSEQUAL
-
token.MINEQUAL
-
token.STAREQUAL
-
token.SLASHEQUAL
-
token.PERCENTEQUAL
-
token.AMPEREQUAL
-
token.VBAREQUAL
-
token.CIRCUMFLEXEQUAL
-
token.LEFTSHIFTEQUAL
-
token.RIGHTSHIFTEQUAL
-
token.DOUBLESTAREQUAL
-
token.DOUBLESLASH
-
token.DOUBLESLASHEQUAL
-
token.AT
-
token.OP
-
token.ERRORTOKEN
-
token.N_TOKENS
-
token.NT_OFFSET
See also
- Module parser
- The second example for the parser module shows how to use the
symbol module.
