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# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001 Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
# Translators:
# python-doc bot, 2025
# Inada Naoki <songofacandy@gmail.com>, 2026
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Python 3.15\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2026-10-25 17:19+0000\n"
"PO-Revision-Date: 2025-09-16 00:01+0000\n"
"Last-Translator: Inada Naoki <songofacandy@gmail.com>, 2026\n"
"Language-Team: Japanese (https://app.transifex.com/python-doc/teams/5390/"
"ja/)\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Language: ja\n"
"Plural-Forms: nplurals=1; plural=0;\n"
#: ../../library/contextlib.rst:2
msgid ""
":mod:`!contextlib` --- Utilities for :keyword:`!with`\\ -statement contexts"
msgstr ":mod:`!contextlib` --- :keyword:`!with` 文コンテキスト用ユーティリティ"
#: ../../library/contextlib.rst:7
msgid "**Source code:** :source:`Lib/contextlib.py`"
msgstr "**ソースコード:** :source:`Lib/contextlib.py`"
#: ../../library/contextlib.rst:11
msgid ""
"This module provides utilities for common tasks involving "
"the :keyword:`with` statement. For more information see "
"also :ref:`typecontextmanager` and :ref:`context-managers`."
msgstr ""
"このモジュールは :keyword:`with` 文に関わる一般的なタスクのためのユーティリ"
"ティを提供します。詳しい情報は、 :ref:`typecontextmanager` と :ref:`context-"
"managers` を参照してください。"
#: ../../library/contextlib.rst:17
msgid "Utilities"
msgstr "ユーティリティ"
#: ../../library/contextlib.rst:19
msgid "Functions and classes provided:"
msgstr "以下の関数とクラスを提供しています:"
msgid ""
"An :term:`abstract base class` for classes that "
"implement :meth:`~object.__enter__` and :meth:`~object.__exit__`. A default "
"implementation for :meth:`~object.__enter__` is provided which returns "
"``self`` while :meth:`~object.__exit__` is an abstract method which by "
"default returns ``None``. See also the definition "
"of :ref:`typecontextmanager`."
msgstr ""
":meth:`~object.__enter__` と :meth:`~object.__exit__` を実装するクラスのため"
"の :term:`abstract base class` です。\n"
":meth:`~object.__enter__` には ``self`` を返すデフォルトの実装があ"
"り、:meth:`~object.__exit__` はデフォルトで ``None`` を返す抽象メソッドで"
"す。\n"
":ref:`typecontextmanager` の定義も参照してください。"
msgid ""
"An :term:`abstract base class` for classes that "
"implement :meth:`~object.__aenter__` and :meth:`~object.__aexit__`. A "
"default implementation for :meth:`~object.__aenter__` is provided which "
"returns ``self`` while :meth:`~object.__aexit__` is an abstract method which "
"by default returns ``None``. See also the definition of :ref:`async-context-"
"managers`."
msgstr ""
":meth:`~object.__aenter__` と :meth:`~object.__aexit__` を実装するクラスのた"
"めの :term:`abstract base class` です。\n"
":meth:`~object.__aenter__` には ``self`` を返すデフォルトの実装があ"
"り、:meth:`~object.__aexit__` はデフォルトで ``None`` を返す抽象メソッドで"
"す。\n"
":ref:`async-context-managers` の定義も参照してください。"
#: ../../library/contextlib.rst:46
msgid ""
"This function is a :term:`decorator` that can be used to define a factory "
"function for :keyword:`with` statement context managers, without needing to "
"create a class or separate :meth:`~object.__enter__` "
"and :meth:`~object.__exit__` methods."
msgstr ""
"この関数は :keyword:`with` 文コンテキストマネージャのファクトリ関数を定義する"
"ために利用できる :term:`デコレータ <decorator>` です。新しいクラス"
"や :meth:`~object.__enter__` と :meth:`~object.__exit__` メソッドを別々に定義"
"しなくても、ファクトリ関数を定義することができます。"
msgid ""
"While many objects natively support use in with statements, sometimes a "
"resource needs to be managed that isn't a context manager in its own right, "
"and doesn't implement a ``close()`` method for use with "
"``contextlib.closing``."
msgstr ""
"多くのオブジェクトは with 文での使用をサポートしていますが、コンテキストマ"
"ネージャではなく、``contextlib.closing`` で使うための ``close()`` メソッドも"
"実装していないリソースを管理する必要が生じることもあります。"
#: ../../library/contextlib.rst:54
msgid ""
"An abstract example would be the following to ensure correct resource "
"management::"
msgstr ""
"リソースを正しく管理するよう保証する抽象的な例は以下のようなものでしょう::"
msgid ""
"from contextlib import contextmanager\n"
"\n"
"@contextmanager\n"
"def managed_resource(*args, **kwds):\n"
" # Code to acquire resource, e.g.:\n"
" resource = acquire_resource(*args, **kwds)\n"
" try:\n"
" yield resource\n"
" finally:\n"
" # Code to release resource, e.g.:\n"
" release_resource(resource)"
msgstr ""
"from contextlib import contextmanager\n"
"\n"
"@contextmanager\n"
"def managed_resource(*args, **kwds):\n"
" # リソースを確保するコードの例:\n"
" resource = acquire_resource(*args, **kwds)\n"
" try:\n"
" yield resource\n"
" finally:\n"
" # リソースを解放するコードの例:\n"
" release_resource(resource)"
#: ../../library/contextlib.rst:69
msgid "The function can then be used like this::"
msgstr "このとき、関数は次のように使うことができます::"
msgid ""
">>> with managed_resource(timeout=3600) as resource:\n"
"... # Resource is released at the end of this block,\n"
"... # even if code in the block raises an exception"
msgstr ""
">>> with managed_resource(timeout=3600) as resource:\n"
"... # ブロック内のコードが例外を送出しても、\n"
"... # ブロックの終わりでリソースは解放されます"
#: ../../library/contextlib.rst:75
msgid ""
"The function being decorated must return a :term:`generator`-iterator when "
"called. This iterator must yield exactly one value, which will be bound to "
"the targets in the :keyword:`with` statement's :keyword:`!as` clause, if any."
msgstr ""
"デコレート対象の関数は呼び出されたときに :term:`ジェネレータ <generator>`-イ"
"テレータを返す必要があります。このイテレータは必ず値を1つ yield しなければな"
"りません。 :keyword:`with` 文の :keyword:`!as` 節が存在するなら、その値は as "
"節のターゲットへ束縛されることになります。"
#: ../../library/contextlib.rst:79
msgid ""
"At the point where the generator yields, the block nested in "
"the :keyword:`with` statement is executed. The generator is then resumed "
"after the block is exited. If an unhandled exception occurs in the block, it "
"is reraised inside the generator at the point where the yield occurred. "
"Thus, you can use a :keyword:`try`...\\ :keyword:`except`..."
"\\ :keyword:`finally` statement to trap the error (if any), or ensure that "
"some cleanup takes place. If an exception is trapped merely in order to log "
"it or to perform some action (rather than to suppress it entirely), the "
"generator must reraise that exception. Otherwise the generator context "
"manager will indicate to the :keyword:`!with` statement that the exception "
"has been handled, and execution will resume with the statement immediately "
"following the :keyword:`!with` statement."
msgstr ""
"ジェネレータが yield を実行した箇所で :keyword:`with` 文のネストされたブロッ"
"クが実行されます。ブロックから抜けた後でジェネレータは再開されます。ブロック"
"内で処理されない例外が発生した場合は、ジェネレータ内部の yield を実行した箇所"
"で例外が再送出されます。なので、(もしあれば) エラーを捕捉したり、クリーンアッ"
"プ処理を確実に実行したりするために、:keyword:`try`...\\ :keyword:`except`..."
"\\ :keyword:`finally` 構文を使用できます。例外を捕捉する目的が、(完全に例外を"
"抑制してしまうのではなく) 単に例外のログをとるため、もしくはあるアクションを"
"実行するためなら、ジェネレータはその例外を再送出しなければなりません。例外を"
"再送出しない場合、ジェネレータのコンテキストマネージャは :keyword:`!with` 文"
"に対して例外が処理されたことを示し、:keyword:`!with` 文の直後の文から実行を再"
"開します。"
msgid ""
":deco:`contextmanager` uses :class:`ContextDecorator` so the context "
"managers it creates can be used as decorators as well as in :keyword:`with` "
"statements. When used as a decorator, a new generator instance is implicitly "
"created on each function call (this allows the otherwise \"one-shot\" "
"context managers created by :deco:`contextmanager` to meet the requirement "
"that context managers support multiple invocations in order to be used as "
"decorators)."
msgstr ""
":deco:`contextmanager` は :class:`ContextDecorator` を使用するため、作成した"
"コンテキストマネージャは :keyword:`with` 文でもデコレータとしても使用できま"
"す。\n"
"デコレータとして使う場合は、関数を呼び出すたびに、新しいジェネレータインスタ"
"ンスが暗黙に作成されます (これにより、:deco:`contextmanager` が作成する、本来"
"は一度しか使えないコンテキストマネージャも、デコレータとして使うための複数回"
"の呼び出しをサポートするという要件を満たせます)。"
#: ../../library/contextlib.rst:98
msgid "Use of :class:`ContextDecorator`."
msgstr ":class:`ContextDecorator` の使用。"
msgid ""
"Similar to :deco:`~contextlib.contextmanager`, but creates "
"an :ref:`asynchronous context manager <async-context-managers>`."
msgstr ""
":deco:`~contextlib.contextmanager` に似ていますが、:ref:`非同期コンテキストマ"
"ネージャ <async-context-managers>` を作成します。"
#: ../../library/contextlib.rst:107
msgid ""
"This function is a :term:`decorator` that can be used to define a factory "
"function for :keyword:`async with` statement asynchronous context managers, "
"without needing to create a class or separate :meth:`~object.__aenter__` "
"and :meth:`~object.__aexit__` methods. It must be applied to "
"an :term:`asynchronous generator` function."
msgstr ""
"この関数は :keyword:`async with` 文のための非同期コンテキストマネージャのファ"
"クトリ関数を定義するために利用できるデコレータ (:term:`decorator`) です。新し"
"いクラスや :meth:`~object.__aenter__` と :meth:`~object.__aexit__` メソッド"
"を個別に定義する必要はありません。このデコレータは非同期ジェネレータ "
"(:term:`asynchronous generator`) 関数に適用しなければなりません。"
#: ../../library/contextlib.rst:113
msgid "A simple example::"
msgstr "簡単な例::"
msgid ""
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def get_connection():\n"
" conn = await acquire_db_connection()\n"
" try:\n"
" yield conn\n"
" finally:\n"
" await release_db_connection(conn)\n"
"\n"
"async def get_all_users():\n"
" async with get_connection() as conn:\n"
" return conn.query('SELECT ...')"
msgstr ""
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def get_connection():\n"
" conn = await acquire_db_connection()\n"
" try:\n"
" yield conn\n"
" finally:\n"
" await release_db_connection(conn)\n"
"\n"
"async def get_all_users():\n"
" async with get_connection() as conn:\n"
" return conn.query('SELECT ...')"
msgid ""
"Context managers defined with :deco:`asynccontextmanager` can be used either "
"as decorators or with :keyword:`async with` statements::"
msgstr ""
":deco:`asynccontextmanager` で定義したコンテキストマネージャは、デコレータと"
"しても :keyword:`async with` 文でも使用できます。 ::"
msgid ""
"import time\n"
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def timeit():\n"
" now = time.monotonic()\n"
" try:\n"
" yield\n"
" finally:\n"
" print(f'it took {time.monotonic() - now}s to run')\n"
"\n"
"@timeit()\n"
"async def main():\n"
" # ... async code ..."
msgstr ""
"import time\n"
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def timeit():\n"
" now = time.monotonic()\n"
" try:\n"
" yield\n"
" finally:\n"
" print(f'it took {time.monotonic() - now}s to run')\n"
"\n"
"@timeit()\n"
"async def main():\n"
" # ... 非同期のコード ..."
msgid ""
"When used as a decorator, a new generator instance is implicitly created on "
"each function call. This allows the otherwise \"one-shot\" context managers "
"created by :deco:`asynccontextmanager` to meet the requirement that context "
"managers support multiple invocations in order to be used as decorators."
msgstr ""
"デコレータとして使う場合は、関数を呼び出すたびに、新しいジェネレータインスタ"
"ンスが暗黙に作成されます。\n"
"これにより、:deco:`asynccontextmanager` が作成する、本来は一度しか使えないコ"
"ンテキストマネージャも、デコレータとして使うための複数回の呼び出しをサポート"
"するという要件を満たせます。"
msgid ""
"Async context managers created with :deco:`asynccontextmanager` can be used "
"as decorators."
msgstr ""
":deco:`asynccontextmanager` で作成した非同期コンテキストマネージャをデコレー"
"タとして使用できるようになりました。"
#: ../../library/contextlib.rst:161
msgid ""
"Return a context manager that closes *thing* upon completion of the block. "
"This is basically equivalent to::"
msgstr ""
"ブロックの完了時に *thing* を close するコンテキストマネージャを返します。こ"
"れは基本的に以下と等価です::"
msgid ""
"from contextlib import contextmanager\n"
"\n"
"@contextmanager\n"
"def closing(thing):\n"
" try:\n"
" yield thing\n"
" finally:\n"
" thing.close()"
msgstr ""
"from contextlib import contextmanager\n"
"\n"
"@contextmanager\n"
"def closing(thing):\n"
" try:\n"
" yield thing\n"
" finally:\n"
" thing.close()"
#: ../../library/contextlib.rst:173
msgid "And lets you write code like this::"
msgstr ""
"そして、明示的に ``page`` を close する必要なしに、次のように書くことができま"
"す::"
msgid ""
"from contextlib import closing\n"
"from urllib.request import urlopen\n"
"\n"
"with closing(urlopen('https://www.python.org')) as page:\n"
" for line in page:\n"
" print(line)"
msgstr ""
"from contextlib import closing\n"
"from urllib.request import urlopen\n"
"\n"
"with closing(urlopen('https://www.python.org')) as page:\n"
" for line in page:\n"
" print(line)"
#: ../../library/contextlib.rst:182
msgid ""
"without needing to explicitly close ``page``. Even if an error occurs, "
"``page.close()`` will be called when the :keyword:`with` block is exited."
msgstr ""
"``page`` を明示的に close する必要は無く、エラーが発生した場合で"
"も、 :keyword:`with` ブロックを出るときに ``page.close()`` が呼ばれます。"
msgid ""
"Most types managing resources support the :term:`context manager` protocol, "
"which closes *thing* on leaving the :keyword:`with` statement. As "
"such, :func:`!closing` is most useful for third party types that don't "
"support context managers. This example is purely for illustration purposes, "
"as :func:`~urllib.request.urlopen` would normally be used in a context "
"manager."
msgstr ""
"リソースを管理するほとんどの型は :term:`context manager` プロトコルをサポート"
"し、:keyword:`with` 文を抜けるときに *thing* を閉じます。\n"
"そのため、:func:`!closing` はコンテキストマネージャをサポートしないサードパー"
"ティー製の型で特に役立ちます。\n"
":func:`~urllib.request.urlopen` は通常、コンテキストマネージャとして使用する"
"ため、この例は説明のためのものにすぎません。"
#: ../../library/contextlib.rst:196
msgid ""
"Return an async context manager that calls the ``aclose()`` method of "
"*thing* upon completion of the block. This is basically equivalent to::"
msgstr ""
"ブロックの完了時に *thing* の ``aclose()`` メソッドを呼び出すような非同期コン"
"テキストマネージャを返します。これは基本的に以下と等価です::"
msgid ""
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def aclosing(thing):\n"
" try:\n"
" yield thing\n"
" finally:\n"
" await thing.aclose()"
msgstr ""
"from contextlib import asynccontextmanager\n"
"\n"
"@asynccontextmanager\n"
"async def aclosing(thing):\n"
" try:\n"
" yield thing\n"
" finally:\n"
" await thing.aclose()"
#: ../../library/contextlib.rst:208
msgid ""
"Significantly, ``aclosing()`` supports deterministic cleanup of async "
"generators when they happen to exit early by :keyword:`break` or an "
"exception. For example::"
msgstr ""
"重要なことは、たとえば次の例のように :keyword:`break` や例外によって早期にブ"
"ロックが終了した場合に、 ``aclosing()`` は非同期ジェネレータの決定論的なク"
"リーンアップをサポートすることです::"
msgid ""
"from contextlib import aclosing\n"
"\n"
"async with aclosing(my_generator()) as values:\n"
" async for value in values:\n"
" if value == 42:\n"
" break"
msgstr ""
"from contextlib import aclosing\n"
"\n"
"async with aclosing(my_generator()) as values:\n"
" async for value in values:\n"
" if value == 42:\n"
" break"
#: ../../library/contextlib.rst:219
msgid ""
"This pattern ensures that the generator's async exit code is executed in the "
"same context as its iterations (so that exceptions and context variables "
"work as expected, and the exit code isn't run after the lifetime of some "
"task it depends on)."
msgstr ""
"このパターンは、ジェネレータの非同期な終了のコードがイテレーション処理と同じ"
"コンテキストの中で実行されることを保証します (すなわち例外とコンテキスト変数"
"は期待通りに動作し、またジェネレータが依存するタスクの寿命が尽きたあとに終了"
"のコードが実行されることもありません)。"
msgid ""
"Return a context manager that returns *enter_result* "
"from :meth:`~object.__enter__`, but otherwise does nothing. It is intended "
"to be used as a stand-in for an optional context manager, for example::"
msgstr ""
":meth:`~object.__enter__` から *enter_result* を返し、それ以外は何もしないコ"
"ンテキストマネージャを返します。\n"
"省略可能なコンテキストマネージャの代役として使用することを意図しています。\n"
"例えば次のように使います。 ::"
msgid ""
"def myfunction(arg, ignore_exceptions=False):\n"
" if ignore_exceptions:\n"
" # Use suppress to ignore all exceptions.\n"
" cm = contextlib.suppress(Exception)\n"
" else:\n"
" # Do not ignore any exceptions, cm has no effect.\n"
" cm = contextlib.nullcontext()\n"
" with cm:\n"
" # Do something"
msgstr ""
"def myfunction(arg, ignore_exceptions=False):\n"
" if ignore_exceptions:\n"
" # suppress を使ってすべての例外を無視します。\n"
" cm = contextlib.suppress(Exception)\n"
" else:\n"
" # 例外を無視せず、cm は何も行いません。\n"
" cm = contextlib.nullcontext()\n"
" with cm:\n"
" # 何らかの処理"
#: ../../library/contextlib.rst:245
msgid "An example using *enter_result*::"
msgstr "*enter_result* を使った例です::"
msgid ""
"def process_file(file_or_path):\n"
" if isinstance(file_or_path, str):\n"
" # If string, open file\n"
" cm = open(file_or_path)\n"
" else:\n"
" # Caller is responsible for closing file\n"
" cm = nullcontext(file_or_path)\n"
"\n"
" with cm as file:\n"
" # Perform processing on the file"
msgstr ""
"def process_file(file_or_path):\n"
" if isinstance(file_or_path, str):\n"
" # 文字列の場合はファイルを開きます\n"
" cm = open(file_or_path)\n"
" else:\n"
" # ファイルを閉じる責任は呼び出し側にあります\n"
" cm = nullcontext(file_or_path)\n"
"\n"
" with cm as file:\n"
" # ファイルを処理します"
#: ../../library/contextlib.rst:258
msgid ""
"It can also be used as a stand-in for :ref:`asynchronous context managers "
"<async-context-managers>`::"
msgstr ""
":ref:`非同期コンテキストマネージャ <async-context-managers>` の代役として使う"
"こともできます::"
msgid ""
"async def send_http(session=None):\n"
" if not session:\n"
" # If no http session, create it with aiohttp\n"
" cm = aiohttp.ClientSession()\n"
" else:\n"
" # Caller is responsible for closing the session\n"
" cm = nullcontext(session)\n"
"\n"
" async with cm as session:\n"
" # Send http requests with session"
msgstr ""
"async def send_http(session=None):\n"
" if not session:\n"
" # HTTP セッションがなければ aiohttp で作成します\n"
" cm = aiohttp.ClientSession()\n"
" else:\n"
" # セッションを閉じる責任は呼び出し側にあります\n"
" cm = nullcontext(session)\n"
"\n"
" async with cm as session:\n"
" # session を使って HTTP リクエストを送信します"
#: ../../library/contextlib.rst:274
msgid ":term:`asynchronous context manager` support was added."
msgstr ""
"非同期コンテキストマネージャ (:term:`asynchronous context manager`) のサポー"
"トが追加されました。"
#: ../../library/contextlib.rst:281
msgid ""
"Return a context manager that suppresses any of the specified exceptions if "
"they occur in the body of a :keyword:`!with` statement and then resumes "
"execution with the first statement following the end of the :keyword:`!with` "
"statement."
msgstr ""
":keyword:`!with` 文の内部で指定された例外の発生を抑えるコンテキストマネージャ"
"を返します。 :keyword:`!with` 文の後に続く最初の文から処理が再開されます。"
#: ../../library/contextlib.rst:286
msgid ""
"As with any other mechanism that completely suppresses exceptions, this "
"context manager should be used only to cover very specific errors where "
"silently continuing with program execution is known to be the right thing to "
"do."
msgstr ""
"ほかの完全に例外を抑制するメカニズム同様、このコンテキストマネージャは、黙っ"
"てプログラム実行を続けることが正しいことであるとわかっている、非常に限定的な"
"エラーをカバーする以上の使い方はしてはいけません。"
#: ../../library/contextlib.rst:291
msgid "For example::"
msgstr "例えば::"
msgid ""
"from contextlib import suppress\n"
"\n"
"with suppress(FileNotFoundError):\n"
" os.remove('somefile.tmp')\n"
"\n"
"with suppress(FileNotFoundError):\n"
" os.remove('someotherfile.tmp')"
msgstr ""
"from contextlib import suppress\n"
"\n"
"with suppress(FileNotFoundError):\n"
" os.remove('somefile.tmp')\n"
"\n"
"with suppress(FileNotFoundError):\n"
" os.remove('someotherfile.tmp')"
#: ../../library/contextlib.rst:301
msgid "This code is equivalent to::"
msgstr "これは以下と等価です::"
msgid ""
"try:\n"
" os.remove('somefile.tmp')\n"
"except FileNotFoundError:\n"
" pass\n"
"\n"
"try:\n"
" os.remove('someotherfile.tmp')\n"
"except FileNotFoundError:\n"
" pass"
msgstr ""
"try:\n"
" os.remove('somefile.tmp')\n"
"except FileNotFoundError:\n"
" pass\n"
"\n"
"try:\n"
" os.remove('someotherfile.tmp')\n"
"except FileNotFoundError:\n"
" pass"
#: ../../library/contextlib.rst:313 ../../library/contextlib.rst:362
#: ../../library/contextlib.rst:372 ../../library/contextlib.rst:389
msgid "This context manager is :ref:`reentrant <reentrant-cms>`."
msgstr ""
"このコンテキストマネージャは :ref:`再入可能(リエントラント) <reentrant-cms>` "
"です。"
msgid ""
"If the code within the :keyword:`!with` block raises "
"a :exc:`BaseExceptionGroup`, suppressed exceptions are removed from the "
"group. Any exceptions of the group which are not suppressed are re-raised "
"in a new group which is created using the original "
"group's :meth:`~BaseExceptionGroup.derive` method."
msgstr ""
":keyword:`!with` ブロック内のコードが :exc:`BaseExceptionGroup` を送出した場"
"合、抑制対象の例外はグループから取り除かれます。\n"
"グループ内の抑制されなかった例外は、元のグループ"
"の :meth:`~BaseExceptionGroup.derive` メソッドで作成した新しいグループにまと"
"めて再送出されます。"
msgid ""
"``suppress`` now supports suppressing exceptions raised as part of "
"a :exc:`BaseExceptionGroup`."
msgstr ""
"``suppress`` は、:exc:`BaseExceptionGroup` の一部として送出された例外の抑制を"
"サポートするようになりました。"
msgid ""
"Context manager for temporarily redirecting :data:`sys.stdout` to "
"another :term:`file object`."
msgstr ""
":data:`sys.stdout` を一時的に別の :term:`file object` にリダイレクトするコン"
"テキストマネージャです。"
msgid ""
"This tool adds flexibility to existing functions or classes whose output is "
"hardwired to :data:`sys.stdout`."
msgstr ""
"このツールは、出力先が :data:`sys.stdout` に固定されている既存の関数やクラス"
"を柔軟に使えるようにします。"
msgid ""
"For example, the output of :func:`help` normally is sent to *sys.stdout*. "
"You can capture that output in a string by redirecting the output to "
"an :class:`io.StringIO` object. The replacement stream is returned from "
"the :meth:`~object.__enter__` method and so is available as the target of "
"the :keyword:`with` statement::"
msgstr ""
"例えば、:func:`help` の出力は通常 *sys.stdout* に送られます。\n"
"出力先を :class:`io.StringIO` オブジェクトにリダイレクトすれば、出力を文字列"
"として取得できます。\n"
"置き換え先のストリームは :meth:`~object.__enter__` メソッドから返されるの"
"で、:keyword:`with` 文のターゲットとして使用できます。 ::"
msgid ""
"with redirect_stdout(io.StringIO()) as f:\n"
" help(pow)\n"
"s = f.getvalue()"
msgstr ""
"with redirect_stdout(io.StringIO()) as f:\n"
" help(pow)\n"
"s = f.getvalue()"
#: ../../library/contextlib.rst:345
msgid ""
"To send the output of :func:`help` to a file on disk, redirect the output to "
"a regular file::"
msgstr ""
":func:`help` の出力をディスク上のファイルに送るためには、出力を通常のファイル"
"にリダイレクトします::"
msgid ""
"with open('help.txt', 'w') as f:\n"
" with redirect_stdout(f):\n"
" help(pow)"
msgstr ""
"with open('help.txt', 'w') as f:\n"
" with redirect_stdout(f):\n"
" help(pow)"
#: ../../library/contextlib.rst:352
msgid "To send the output of :func:`help` to *sys.stderr*::"
msgstr ""
":func:`help` の出力を標準エラー出力 (*sys.stderr*) に送るには以下のようにしま"
"す::"
msgid ""
"with redirect_stdout(sys.stderr):\n"
" help(pow)"
msgstr ""
"with redirect_stdout(sys.stderr):\n"
" help(pow)"
#: ../../library/contextlib.rst:357
msgid ""
"Note that the global side effect on :data:`sys.stdout` means that this "
"context manager is not suitable for use in library code and most threaded "
"applications. It also has no effect on the output of subprocesses. However, "
"it is still a useful approach for many utility scripts."
msgstr ""
":data:`sys.stdout` のシステム全体にわたる副作用により、このコンテキストマネー"
"ジャはライブラリコードやマルチスレッドアプリケーションでの使用には適していま"
"せん。また、サブプロセスの出力に対しても効果がありません。そのような制限はあ"
"りますが、それでも多くのユーティリティスクリプトに対して有用なアプローチで"
"す。"
msgid ""
"Similar to :func:`~contextlib.redirect_stdout` but redirecting the "
"global :data:`sys.stderr` to another :term:`file object`."
msgstr ""
":func:`~contextlib.redirect_stdout` に似ていますが、グローバル"
"な :data:`sys.stderr` を別の :term:`file object` にリダイレクトします。"
#: ../../library/contextlib.rst:379
msgid ""
"Non parallel-safe context manager to change the current working directory. "
"As this changes a global state, the working directory, it is not suitable "
"for use in most threaded or async contexts. It is also not suitable for most "
"non-linear code execution, like generators, where the program execution is "
"temporarily relinquished -- unless explicitly desired, you should not yield "
"when this context manager is active."
msgstr ""
"現在の作業ディレクトリを変更するパラレル非安全なコンテキストマネージャです。"
"グローバルな状態である作業ディレクトリを変更するため、ほとんどのマルチスレッ"
"ドまたは非同期のコンテキストに対する利用は適切ではありません。また、プログラ"
"ムの実行権限を一時的に放棄するジェネレータのような、直線的でないコードを実行"
"する場合も適切ではありません -- 明確に必要でないかぎり、このコンテキストマ"
"ネージャがアクティブな状態で yield すべきではありません。"
#: ../../library/contextlib.rst:386
msgid ""
"This is a simple wrapper around :func:`~os.chdir`, it changes the current "
"working directory upon entering and restores the old one on exit."
msgstr ""
"これは :func:`~os.chdir` の単純なラッパーで、コンテキストに入るときに現在の作"
"業ディレクトリを変更し、終了時に元の作業ディレクトリを復元します。"
#: ../../library/contextlib.rst:396
msgid ""
"A base class that enables a context manager to also be used as a decorator."
msgstr ""
"コンテキストマネージャをデコレータとしても使用できるようにする基底クラスで"
"す。"
msgid ""
"Context managers inheriting from ``ContextDecorator`` have to "
"implement :meth:`~object.__enter__` and :meth:`~object.__exit__` as normal. "
"``__exit__`` retains its optional exception handling even when used as a "
"decorator."
msgstr ""
"``ContextDecorator`` を継承するコンテキストマネージャは、通常どお"
"り :meth:`~object.__enter__` と :meth:`~object.__exit__` を実装する必要があり"
"ます。\n"
"デコレータとして使用した場合も、``__exit__`` で任意に例外処理を行えます。"
msgid ""
"``ContextDecorator`` is used by :deco:`contextmanager`, so you get this "
"functionality automatically."
msgstr ""
":deco:`contextmanager` は ``ContextDecorator`` を使用するため、この機能を自動"
"的に利用できます。"
#: ../../library/contextlib.rst:406
msgid "Example of ``ContextDecorator``::"
msgstr "``ContextDecorator`` の例::"
msgid ""
"from contextlib import ContextDecorator\n"
"\n"
"class mycontext(ContextDecorator):\n"
" def __enter__(self):\n"
" print('Starting')\n"
" return self\n"
"\n"
" def __exit__(self, *exc):\n"
" print('Finishing')\n"
" return False"
msgstr ""
"from contextlib import ContextDecorator\n"
"\n"
"class mycontext(ContextDecorator):\n"
" def __enter__(self):\n"
" print('Starting')\n"
" return self\n"
"\n"
" def __exit__(self, *exc):\n"
" print('Finishing')\n"
" return False"
#: ../../library/contextlib.rst:419 ../../library/contextlib.rst:519
msgid "The class can then be used like this::"
msgstr "このとき、クラスは次のように使うことができます::"
msgid ""
">>> @mycontext()\n"
"... def function():\n"
"... print('The bit in the middle')\n"
"...\n"
">>> function()\n"
"Starting\n"
"The bit in the middle\n"
"Finishing\n"
"\n"
">>> with mycontext():\n"
"... print('The bit in the middle')\n"
"...\n"
"Starting\n"
"The bit in the middle\n"
"Finishing"
msgstr ""
">>> @mycontext()\n"
"... def function():\n"
"... print('The bit in the middle')\n"
"...\n"
">>> function()\n"
"Starting\n"
"The bit in the middle\n"
"Finishing\n"
"\n"
">>> with mycontext():\n"
"... print('The bit in the middle')\n"
"...\n"
"Starting\n"
"The bit in the middle\n"
"Finishing"
#: ../../library/contextlib.rst:437
msgid ""
"This change is just syntactic sugar for any construct of the following form::"
msgstr "これは次のような形のコードに対するシンタックスシュガーになります::"
msgid ""
"def f():\n"
" with cm():\n"
" # Do stuff"
msgstr ""
"def f():\n"
" with cm():\n"
" # 処理を行います"
#: ../../library/contextlib.rst:443
msgid "``ContextDecorator`` lets you instead write::"
msgstr "``ContextDecorator`` を使うと代わりに次のように書けます::"
msgid ""
"@cm()\n"
"def f():\n"
" # Do stuff"
msgstr ""
"@cm()\n"
"def f():\n"
" # 処理を行います"
#: ../../library/contextlib.rst:449
msgid ""
"It makes it clear that the ``cm`` applies to the whole function, rather than "
"just a piece of it (and saving an indentation level is nice, too)."
msgstr ""
"デコレーターを使うと、``cm`` が関数の一部ではなく全体に適用されていることが明"
"確になります (インデントレベルを1つ節約できるのもメリットです)。"
#: ../../library/contextlib.rst:452
msgid ""
"Existing context managers that already have a base class can be extended by "
"using ``ContextDecorator`` as a mixin class::"
msgstr ""
"すでに基底クラスを持っているコンテキストマネージャーも、``ContextDecorator`` "
"を mixin クラスとして利用することで拡張できます::"
msgid ""
"from contextlib import ContextDecorator\n"
"\n"
"class mycontext(ContextBaseClass, ContextDecorator):\n"
" def __enter__(self):\n"
" return self\n"
"\n"
" def __exit__(self, *exc):\n"
" return False"
msgstr ""
"from contextlib import ContextDecorator\n"
"\n"
"class mycontext(ContextBaseClass, ContextDecorator):\n"
" def __enter__(self):\n"
" return self\n"
"\n"
" def __exit__(self, *exc):\n"
" return False"
#: ../../library/contextlib.rst:465
msgid ""
"As the decorated function must be able to be called multiple times, the "
"underlying context manager must support use in multiple :keyword:`with` "
"statements. If this is not the case, then the original construct with the "
"explicit :keyword:`!with` statement inside the function should be used."
msgstr ""
"デコレートされた関数が複数回呼び出せるように、内部のコンテキストマネージャー"
"は複数の :keyword:`with` 文に対応する必要があります。そうでないなら、明示的"
"な :keyword:`!with` 文を関数内で利用するべきです。"
msgid ""
"When the decorated callable is a generator function, coroutine function, or "
"asynchronous generator function, the returned wrapper is of the same kind "
"and keeps the context manager open for the lifetime of the iteration or "
"await rather than only for the call that creates the generator or coroutine "
"object. Wrapped generators and asynchronous generators are explicitly "
"closed when iteration ends, as if by :func:`closing` or :func:`aclosing`."
msgstr ""
"デコレートする呼び出し可能オブジェクトがジェネレータ関数、コルーチン関数、非"
"同期ジェネレータ関数の場合、返されるラッパーも同じ種類になります。\n"
"コンテキストマネージャは、ジェネレータやコルーチンオブジェクトを作成する呼び"
"出しの間だけでなく、反復や await の間ずっと開いたままになります。\n"
"ラップされたジェネレータと非同期ジェネレータは、反復の終了時"
"に :func:`closing` や :func:`aclosing` を使った場合と同様に明示的に閉じられま"
"す。"
msgid ""
"For asynchronous generators the wrapper re-yields each value with ``async "
"for``; values sent with :meth:`~agen.asend` and exceptions thrown "
"with :meth:`~agen.athrow` are not forwarded to the wrapped generator."
msgstr ""
"非同期ジェネレータのラッパーは、``async for`` を使って各値を再度 yield しま"
"す。\n"
":meth:`~agen.asend` で送った値や :meth:`~agen.athrow` で投げ込んだ例外は、"
"ラップされたジェネレータには転送されません。"
msgid ""
"Decorating a generator function, coroutine function, or asynchronous "
"generator function now keeps the context manager open across iteration or "
"await. Previously the context manager exited as soon as the generator or "
"coroutine object was created."
msgstr ""
"ジェネレータ関数、コルーチン関数、非同期ジェネレータ関数をデコレートすると、"
"反復や await の間もコンテキストマネージャを開いたままにするようになりまし"
"た。\n"
"以前は、ジェネレータやコルーチンオブジェクトを作成するとすぐにコンテキストマ"
"ネージャを終了していました。"
msgid ""
"Similar to :class:`ContextDecorator`, but the context manager is entered and "
"exited with :keyword:`async with`. Decorate coroutine functions and "
"asynchronous generator functions with this class; the returned wrapper is of "
"the same kind."
msgstr ""
":class:`ContextDecorator` に似ていますが、コンテキストマネージャへの出入り"
"に :keyword:`async with` を使います。\n"
"このクラスは、コルーチン関数と非同期ジェネレータ関数のデコレートに使ってくだ"
"さい。\n"
"返されるラッパーも同じ種類になります。"
msgid ""
"Synchronous functions and generators are accepted, but the wrapper is always "
"asynchronous, so the decorated callable must then be awaited or iterated "
"with ``async for``. If that change of calling convention is not intended, "
"use :class:`ContextDecorator` instead."
msgstr ""
"同期関数と同期ジェネレータも受け付けますが、ラッパーは常に非同期になるため、"
"デコレートした呼び出し可能オブジェクトは await するか、``async for`` で反復す"
"る必要があります。\n"
"呼び出し方を変更する意図がない場合は、代わりに :class:`ContextDecorator` を"
"使ってください。"
#: ../../library/contextlib.rst:505
msgid "Example of ``AsyncContextDecorator``::"
msgstr "``AsyncContextDecorator`` の使用例::"
msgid ""
"from asyncio import run\n"
"from contextlib import AsyncContextDecorator\n"
"\n"
"class mycontext(AsyncContextDecorator):\n"
" async def __aenter__(self):\n"
" print('Starting')\n"
" return self\n"
"\n"
" async def __aexit__(self, *exc):\n"
" print('Finishing')\n"
" return False"
msgstr ""
"from asyncio import run\n"
"from contextlib import AsyncContextDecorator\n"
"\n"
"class mycontext(AsyncContextDecorator):\n"
" async def __aenter__(self):\n"
" print('Starting')\n"