token --- Python 解析木で使われる定数

ソースコード: Lib/token.py

---

このモジュールは解析木の葉ノード(終端記号)の数値を表す定数を提供します。言語の文法のコンテキストにおける名前の定義については、 Python ディストリビューションのファイル file:Grammar/Tokens を参照してください。名前がマップする特定の数値は Python のバージョン間で変わります。

このモジュールは、数値コードから名前へのマッピングと、いくつかの関数も提供しています。関数は Python の C ヘッダファイルの定義を反映します。

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

ディクショナリはこのモジュールで定義されている定数の数値を名前の文字列へマップし、より人が読みやすいように解析木を表現します。

token.ISTERMINAL(x)

終端トークンの値に対して True を返します。

token.ISNONTERMINAL(x)

非終端トークンの値に対して True を返します。

token.ISEOF(x)

x が入力の終わりを示すマーカーならば、 True を返します。

token の定数一覧:

token.NAME

Token value that indicates an identifier. Note that keywords are also initially tokenized an NAME tokens.

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.

CPython 実装の詳細: This value is only reported by the tokenize module. Internally, the tokenizer uses exact token types instead.

token.COMMENT

Token value used to indicate a comment. The parser ignores COMMENT tokens.

token.NEWLINE

Token value that indicates the end of a logical line.

token.NL

Token value used to indicate a non-terminating newline. NL tokens are generated when a logical line of code is continued over multiple physical lines. The parser ignores NL tokens.

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.

CPython 実装の詳細: 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.

CPython 実装の詳細: Replacement fields (that is, the non-literal parts of f-strings) use the same tokens as other expressions, and are delimited by LBRACE, RBRACE, EXCLAMATION and COLON tokens.

token.FSTRING_END

Token value used to indicate the end of a f-string.

CPython 実装の詳細: The token string contains the closing quote(s).

token.ENDMARKER

Token value that indicates the end of input.

token.ENCODING

ソースの bytes をテキストにデコードするために使われるエンコーディングを示すトークン値。tokenize.tokenize() は常に最初に ENCODING トークンを返します。

CPython 実装の詳細: This token type isn't used by the C tokenizer but is needed for the tokenize module.

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: ignore comment was recognized. Such tokens are produced instead of regular COMMENT tokens only with the PyCF_TYPE_COMMENTS flag.

token.TYPE_COMMENT

Token value indicating that a type comment was recognized. Such tokens are produced instead of regular COMMENT tokens only with the PyCF_TYPE_COMMENTS flag.

token.SOFT_KEYWORD

Token value indicating a soft keyword.

The tokenizer never produces this value. To check for a soft keyword, pass a NAME token's string to keyword.issoftkeyword().

token.ERRORTOKEN

Token value used to indicate wrong input.

The tokenize module generally indicates errors by raising exceptions instead of emitting this token. It can also emit tokens such as OP or NAME with 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	値
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.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.ATEQUAL	"@="
token.RARROW	"->"
token.ELLIPSIS	"..."
token.COLONEQUAL	":="
token.EXCLAMATION	"!"

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.

バージョン 3.5 で変更: Added AWAIT and ASYNC tokens.

バージョン 3.7 で変更: COMMENT 、NL、ENCODING トークンが追加されました。

バージョン 3.7 で変更: Removed AWAIT and ASYNC tokens. "async" and "await" are now tokenized as NAME tokens.

バージョン 3.8 で変更: 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).

バージョン 3.12 で変更: Added EXCLAMATION.

バージョン 3.13 で変更: Removed AWAIT and ASYNC tokens again.