token — Constants used with Python parse trees¶
Código fuente: Lib/token.py
Este módulo proporciona constantes que representan los valores numéricos de los nodos hoja del árbol de análisis (tokens terminales). Consulte el archivo Grammar/Tokens en la distribución de Python para conocer las definiciones de los nombres en el contexto de la gramática del lenguaje. Los valores numéricos específicos a los que se asignan los nombres pueden cambiar entre las versiones de Python.
El módulo también proporciona un mapeo de códigos numéricos a nombres y algunas funciones. Las funciones asemejan definiciones en los archivos Python C encabezados.
Note that a token’s value may depend on tokenizer options. For example, a
"+" token may be reported as either PLUS or OP, or
a "match" token may be either NAME or SOFT_KEYWORD.
- token.tok_name¶
Diccionario que mapea los valores numéricos de las constantes definidas en este módulo a cadenas de nombres, permitiendo una representación de árboles de sintaxis a ser generados más legible para humanos.
- token.ISTERMINAL(x)¶
Retorna
Truepara valores token terminales.
- token.ISNONTERMINAL(x)¶
Retorna
Truepara valores token no terminales.
- token.ISEOF(x)¶
Retorna
Truesi x es el marcador indicando el final del input.
Las constantes de token son:
- token.NAME¶
Token value that indicates an identifier. Note that keywords are also initially tokenized an
NAMEtokens.
- token.NUMBER¶
Token value that indicates a numeric literal
- token.STRING¶
Token value that indicates a string or byte literal, excluding formatted string literals. The token string is not interpreted: it includes the surrounding quotation marks and the prefix (if given); backslashes are included literally, without processing escape sequences.
- token.OP¶
A generic token value that indicates an operator or delimiter.
Detalles de implementación de CPython: This value is only reported by the
tokenizemodule. Internally, the tokenizer uses exact token types instead.
- token.COMMENT¶
Token value used to indicate a comment. The parser ignores
COMMENTtokens.
- token.NEWLINE¶
Token value that indicates the end of a logical line.
- token.NL¶
Token value used to indicate a non-terminating newline.
NLtokens are generated when a logical line of code is continued over multiple physical lines. The parser ignoresNLtokens.
- token.INDENT¶
Token value used at the beginning of a logical line to indicate the start of an indented block.
- token.DEDENT¶
Token value used at the beginning of a logical line to indicate the end of an indented block.
- token.FSTRING_START¶
Token value used to indicate the beginning of an f-string literal.
Detalles de implementación de CPython: The token string includes the prefix and the opening quote(s), but none of the contents of the literal.
- token.FSTRING_MIDDLE¶
Token value used for literal text inside an f-string literal, including format specifications.
Detalles de implementación de CPython: Replacement fields (that is, the non-literal parts of f-strings) use the same tokens as other expressions, and are delimited by
LBRACE,RBRACE,EXCLAMATIONandCOLONtokens.
- token.FSTRING_END¶
Token value used to indicate the end of a f-string.
Detalles de implementación de CPython: The token string contains the closing quote(s).
- token.ENDMARKER¶
Token value that indicates the end of input. Used in top-level grammar rules.
- token.ENCODING¶
Valor de token que indica la codificación usada para decodificar los bytes de origen en texto. El primer token retornado por
tokenize.tokenize()siempre será un tokenENCODING.Detalles de implementación de CPython: This token type isn’t used by the C tokenizer but is needed for the
tokenizemodule.
The following token types are not produced by the tokenize module,
and are defined for special uses in the tokenizer or parser:
- token.TYPE_IGNORE¶
Token value indicating that a
type: ignorecomment was recognized. Such tokens are produced instead of regularCOMMENTtokens only with thePyCF_TYPE_COMMENTSflag.
- token.TYPE_COMMENT¶
Token value indicating that a type comment was recognized. Such tokens are produced instead of regular
COMMENTtokens only with thePyCF_TYPE_COMMENTSflag.
- token.SOFT_KEYWORD¶
Token value indicating a soft keyword.
The tokenizer never produces this value. To check for a soft keyword, pass a
NAMEtoken’s string tokeyword.issoftkeyword().
- token.ERRORTOKEN¶
Token value used to indicate wrong input.
The
tokenizemodule generally indicates errors by raising exceptions instead of emitting this token. It can also emit tokens such asOPorNAMEwith strings that are later rejected by the parser.
The remaining tokens represent specific operators and
delimiters.
(The tokenize module reports these as OP; see exact_type
in the tokenize documentation for details.)
Token |
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The following non-token constants are provided:
- token.N_TOKENS¶
The number of token types defined in this module.
- token.EXACT_TOKEN_TYPES¶
A dictionary mapping the string representation of a token to its numeric code.
Added in version 3.8.
Distinto en la versión 3.5: Added AWAIT and ASYNC tokens.
Distinto en la versión 3.7: Removed AWAIT and ASYNC tokens. «async» and «await» are
now tokenized as NAME tokens.
Distinto en la versión 3.8: Added TYPE_COMMENT, TYPE_IGNORE, COLONEQUAL.
Added AWAIT and ASYNC tokens back (they’re needed
to support parsing older Python versions for ast.parse() with
feature_version set to 6 or lower).
Distinto en la versión 3.12: Added EXCLAMATION.
Distinto en la versión 3.13: Removed AWAIT and ASYNC tokens again.