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