: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> **Source code:** :source:`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 :file:`Grammar/Tokens` 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. .. 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. The token constants are: .. include:: token-list.inc The following token type values aren't used by the C tokenizer but are needed for the :mod:`tokenize` module. .. data:: COMMENT Token value used to indicate a comment. .. data:: NL Token value used to indicate a non-terminating newline. The :data:`NEWLINE` token indicates the end of a logical line of Python code; ``NL`` tokens are generated when a logical line of code is continued over multiple physical lines. .. data:: ENCODING Token value that indicates the encoding used to decode the source bytes into text. The first token returned by :func:`tokenize.tokenize` will always be an ``ENCODING`` token. .. data:: TYPE_COMMENT :noindex: Token value indicating that a type comment was recognized. Such tokens are only produced when :func:`ast.parse()` is invoked with ``type_comments=True``. .. versionchanged:: 3.5 Added :data:`AWAIT` and :data:`ASYNC` tokens. .. versionchanged:: 3.7 Added :data:`COMMENT`, :data:`NL` and :data:`ENCODING` tokens. .. versionchanged:: 3.7 Removed :data:`AWAIT` and :data:`ASYNC` tokens. "async" and "await" are now tokenized as :data:`NAME` tokens. .. versionchanged:: 3.8 Added :data:`TYPE_COMMENT`, :data:`TYPE_IGNORE`, :data:`COLONEQUAL`. Added :data:`AWAIT` and :data:`ASYNC` tokens back (they're needed to support parsing older Python versions for :func:`ast.parse` with ``feature_version`` set to 6 or lower).
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