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2486 lines (2260 loc) · 97.6 KB
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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
# TENMYO Masakazu, 2025
# Takanori Suzuki <takanori@takanory.net>, 2026
# Inada Naoki <songofacandy@gmail.com>, 2026
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Python 3.15\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2026-10-23 18:01+0000\n"
"PO-Revision-Date: 2025-09-16 00:02+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"
#: ../../tutorial/controlflow.rst:5
msgid "More Control Flow Tools"
msgstr "その他の制御フローツール"
#: ../../tutorial/controlflow.rst:7
msgid ""
"As well as the :keyword:`while` statement just introduced, Python uses a few "
"more that we will encounter in this chapter."
msgstr ""
"前章で紹介した :keyword:`while` 文の他にも、 Python にはいくつか制御フロー"
"ツールがあり、本章で説明します。"
#: ../../tutorial/controlflow.rst:14
msgid ":keyword:`!if` Statements"
msgstr ":keyword:`!if` 文"
#: ../../tutorial/controlflow.rst:16
msgid ""
"Perhaps the most well-known statement type is the :keyword:`if` statement. "
"For example::"
msgstr "おそらく最もおなじみの文型は :keyword:`if` 文でしょう。例えば::"
#: ../../tutorial/controlflow.rst:19
msgid ""
">>> x = int(input(\"Please enter an integer: \"))\n"
"Please enter an integer: 42\n"
">>> if x < 0:\n"
"... x = 0\n"
"... print('Negative changed to zero')\n"
"... elif x == 0:\n"
"... print('Zero')\n"
"... elif x == 1:\n"
"... print('Single')\n"
"... else:\n"
"... print('More')\n"
"...\n"
"More"
msgstr ""
">>> x = int(input(\"Please enter an integer: \"))\n"
"Please enter an integer: 42\n"
">>> if x < 0:\n"
"... x = 0\n"
"... print('Negative changed to zero')\n"
"... elif x == 0:\n"
"... print('Zero')\n"
"... elif x == 1:\n"
"... print('Single')\n"
"... else:\n"
"... print('More')\n"
"...\n"
"More"
#: ../../tutorial/controlflow.rst:33
msgid ""
"There can be zero or more :keyword:`elif` parts, and the :keyword:`else` "
"part is optional. The keyword ':keyword:`!elif`' is short for 'else if', "
"and is useful to avoid excessive indentation. An :keyword:`!"
"if` ... :keyword:`!elif` ... :keyword:`!elif` ... sequence is a substitute "
"for the ``switch`` or ``case`` statements found in other languages."
msgstr ""
"ゼロ個以上の :keyword:`elif` 部を使うことができ、 :keyword:`else` 部を付ける"
"こともできます。キーワード ':keyword:`!elif`' は 'else if' を短くしたもので、"
"過剰なインデントを避けるのに役立ちます。一連の :keyword:`!if` ... :keyword:`!"
"elif` ... :keyword:`!elif` ... は、他の言語における ``switch`` 文や "
"``case`` 文の代用となります。"
msgid ""
"If you're comparing the same value to several constants, or checking for "
"specific types or attributes, you may also find the :keyword:`!match` "
"statement useful. For more details see :ref:`tut-match`."
msgstr ""
"同じ値を複数の定数と比較する場合や、特定の型や属性を確認する場合に"
"は、:keyword:`!match` 文も便利です。詳細は :ref:`tut-match` を参照してくださ"
"い。"
#: ../../tutorial/controlflow.rst:46
msgid ":keyword:`!for` Statements"
msgstr ":keyword:`!for` 文"
msgid ""
"The :keyword:`for` statement in Python differs a bit from what you may be "
"used to in C or Pascal. Rather than always iterating over an arithmetic "
"progression of numbers (like in Pascal), or giving the user the ability to "
"define both the iteration step and halting condition (as C), "
"Python's :keyword:`!for` statement iterates over the items of any sequence "
"(a list or a string), in the order that they appear in the sequence. For "
"example (no pun intended):"
msgstr ""
"Python の :keyword:`for` 文は、読者が C 言語や Pascal 言語で使いなれているか"
"もしれない ``for`` 文とは少し違います。 (Pascal のように) 常に等差数列にわた"
"る反復を行ったり、 (C のように) 繰返しステップと停止条件を両方ともユーザが定"
"義できるようにするのとは違い、Python の :keyword:`!for` 文は、任意のシーケン"
"ス型 (リストまたは文字列) にわたって反復を行います。反復の順番はシーケンス中"
"に要素が現れる順番です。例えば:"
#: ../../tutorial/controlflow.rst:63
msgid ""
">>> # Measure some strings:\n"
">>> words = ['cat', 'window', 'defenestrate']\n"
">>> for w in words:\n"
"... print(w, len(w))\n"
"...\n"
"cat 3\n"
"window 6\n"
"defenestrate 12"
msgstr ""
">>> # 文字列の長さを計測:\n"
">>> words = ['cat', 'window', 'defenestrate']\n"
">>> for w in words:\n"
"... print(w, len(w))\n"
"...\n"
"cat 3\n"
"window 6\n"
"defenestrate 12"
msgid ""
"Code that modifies a collection while iterating over that same collection "
"can be tricky to get right. Instead, it is usually more straight-forward to "
"loop over a copy of the collection or to create a new collection::"
msgstr ""
"コレクションを反復処理しながらそのコレクションを変更するコードを正しく書くの"
"は難しいことがあります。通常は、コレクションのコピーを反復処理するか、新しい"
"コレクションを作成する方が簡単です。 ::"
#: ../../tutorial/controlflow.rst:76
msgid ""
"# Create a sample collection\n"
"users = {'Hans': 'active', 'Éléonore': 'inactive', '景太郎': 'active'}\n"
"\n"
"# Strategy: Iterate over a copy\n"
"for user, status in users.copy().items():\n"
" if status == 'inactive':\n"
" del users[user]\n"
"\n"
"# Strategy: Create a new collection\n"
"active_users = {}\n"
"for user, status in users.items():\n"
" if status == 'active':\n"
" active_users[user] = status"
msgstr ""
"# コレクション作成\n"
"users = {'Hans': 'active', 'Éléonore': 'inactive', '景太郎': 'active'}\n"
"\n"
"# 方針: コピーを反復\n"
"for user, status in users.copy().items():\n"
" if status == 'inactive':\n"
" del users[user]\n"
"\n"
"# 方針: 新コレクション作成\n"
"active_users = {}\n"
"for user, status in users.items():\n"
" if status == 'active':\n"
" active_users[user] = status"
#: ../../tutorial/controlflow.rst:94
msgid "The :func:`range` Function"
msgstr ":func:`range` 関数"
msgid ""
"If you do need to iterate over a sequence of numbers, the built-in "
"function :func:`range` comes in handy. It generates arithmetic "
"progressions::"
msgstr ""
"数列にわたって反復を行う必要がある場合、組み込み関数 :func:`range` が便利で"
"す。この関数は等差数列を生成します。 ::"
#: ../../tutorial/controlflow.rst:99
msgid ""
">>> for i in range(5):\n"
"... print(i)\n"
"...\n"
"0\n"
"1\n"
"2\n"
"3\n"
"4"
msgstr ""
">>> for i in range(5):\n"
"... print(i)\n"
"...\n"
"0\n"
"1\n"
"2\n"
"3\n"
"4"
#: ../../tutorial/controlflow.rst:108
msgid ""
"The given end point is never part of the generated sequence; ``range(10)`` "
"generates 10 values, the legal indices for items of a sequence of length "
"10. It is possible to let the range start at another number, or to specify "
"a different increment (even negative; sometimes this is called the 'step')::"
msgstr ""
"指定した終端値は生成されるシーケンスには入りません。``range(10)`` は 10 個の"
"値を生成し、長さ 10 のシーケンスにおける各項目のインデクスとなります。range "
"を別の数から開始したり、他の増加量 (負でも; 増加量は時に 'ステップ(step)' と"
"呼ばれることもあります) を指定することもできます::"
#: ../../tutorial/controlflow.rst:113
msgid ""
">>> list(range(5, 10))\n"
"[5, 6, 7, 8, 9]\n"
"\n"
">>> list(range(0, 10, 3))\n"
"[0, 3, 6, 9]\n"
"\n"
">>> list(range(-10, -100, -30))\n"
"[-10, -40, -70]"
msgstr ""
">>> list(range(5, 10))\n"
"[5, 6, 7, 8, 9]\n"
"\n"
">>> list(range(0, 10, 3))\n"
"[0, 3, 6, 9]\n"
"\n"
">>> list(range(-10, -100, -30))\n"
"[-10, -40, -70]"
#: ../../tutorial/controlflow.rst:122
msgid ""
"To iterate over the indices of a sequence, you can combine :func:`range` "
"and :func:`len` as follows::"
msgstr ""
"あるシーケンスにわたってインデクスで反復を行うには、 :func:`range` "
"と :func:`len` を次のように組み合わせられます::"
#: ../../tutorial/controlflow.rst:125
msgid ""
">>> a = ['Mary', 'had', 'a', 'little', 'lamb']\n"
">>> for i in range(len(a)):\n"
"... print(i, a[i])\n"
"...\n"
"0 Mary\n"
"1 had\n"
"2 a\n"
"3 little\n"
"4 lamb"
msgstr ""
">>> a = ['Mary', 'had', 'a', 'little', 'lamb']\n"
">>> for i in range(len(a)):\n"
"... print(i, a[i])\n"
"...\n"
"0 Mary\n"
"1 had\n"
"2 a\n"
"3 little\n"
"4 lamb"
#: ../../tutorial/controlflow.rst:135
msgid ""
"In most such cases, however, it is convenient to use the :func:`enumerate` "
"function, see :ref:`tut-loopidioms`."
msgstr ""
"しかし、多くの場合は :func:`enumerate` 関数を使う方が便利です。 :ref:`tut-"
"loopidioms` を参照してください。"
#: ../../tutorial/controlflow.rst:138
msgid "A strange thing happens if you just print a range::"
msgstr "range を直接出力すると変なことになります::"
#: ../../tutorial/controlflow.rst:140
msgid ""
">>> range(10)\n"
"range(0, 10)"
msgstr ""
">>> range(10)\n"
"range(0, 10)"
#: ../../tutorial/controlflow.rst:143
msgid ""
"In many ways the object returned by :func:`range` behaves as if it is a "
"list, but in fact it isn't. It is an object which returns the successive "
"items of the desired sequence when you iterate over it, but it doesn't "
"really make the list, thus saving space."
msgstr ""
":func:`range` が返すオブジェクトは、いろいろな点でリストであるかのように振る"
"舞いますが、本当はリストではありません。これは、イテレートした時に望んだ数列"
"の連続した要素を返すオブジェクトです。しかし実際にリストを作るわけではないの"
"で、スペースの節約になります。"
msgid ""
"We say such an object is :term:`iterable`, that is, suitable as a target for "
"functions and constructs that expect something from which they can obtain "
"successive items until the supply is :term:`exhausted`. We have seen that "
"the :keyword:`for` statement is such a construct, while an example of a "
"function that takes an iterable is :func:`sum`::"
msgstr ""
"このようなオブジェクトを :term:`イテラブル <iterable>` と呼びます。つまり、要"
"素が :term:`尽きる <exhausted>` まで順に取得できるものを必要とする関数や構文"
"で使えます。これまでに見た :keyword:`for` 文がそのような構文の例で、イテラブ"
"ルを受け取る関数の例には :func:`sum` があります。 ::"
#: ../../tutorial/controlflow.rst:154
msgid ""
">>> sum(range(4)) # 0 + 1 + 2 + 3\n"
"6"
msgstr ""
">>> sum(range(4)) # 0 + 1 + 2 + 3\n"
"6"
msgid ""
"Later we will see more functions that return iterables and take iterables as "
"arguments. In chapter :ref:`tut-structures`, we will discuss :func:`list` "
"in more detail."
msgstr ""
"イテラブルを返す関数や、イテラブルを引数に取る関数は後でさらに紹介しま"
"す。 :ref:`tut-structures` の章では :func:`list` について詳しく説明します。"
#: ../../tutorial/controlflow.rst:164
msgid ":keyword:`!break` and :keyword:`!continue` Statements"
msgstr ":keyword:`!break` 文と :keyword:`!continue` 文"
msgid ""
"The :keyword:`break` statement breaks out of the innermost "
"enclosing :keyword:`for` or :keyword:`while` loop::"
msgstr ""
":keyword:`break` 文は、その文を囲む最も内側の :keyword:`for` ループまた"
"は :keyword:`while` ループを抜けます。 ::"
#: ../../tutorial/controlflow.rst:169
msgid ""
">>> for n in range(2, 10):\n"
"... for x in range(2, n):\n"
"... if n % x == 0:\n"
"... print(f\"{n} equals {x} * {n//x}\")\n"
"... break\n"
"...\n"
"4 equals 2 * 2\n"
"6 equals 2 * 3\n"
"8 equals 2 * 4\n"
"9 equals 3 * 3"
msgstr ""
">>> for n in range(2, 10):\n"
"... for x in range(2, n):\n"
"... if n % x == 0:\n"
"... print(f\"{n} は {x} * {n//x} と等しい\")\n"
"... break\n"
"...\n"
"4 は 2 * 2 と等しい\n"
"6 は 2 * 3 と等しい\n"
"8 は 2 * 4 と等しい\n"
"9 は 3 * 3 と等しい"
#: ../../tutorial/controlflow.rst:180
msgid ""
"The :keyword:`continue` statement continues with the next iteration of the "
"loop::"
msgstr ":keyword:`continue` 文はループの次のイテレーションを実行します::"
#: ../../tutorial/controlflow.rst:183
msgid ""
">>> for num in range(2, 10):\n"
"... if num % 2 == 0:\n"
"... print(f\"Found an even number {num}\")\n"
"... continue\n"
"... print(f\"Found an odd number {num}\")\n"
"...\n"
"Found an even number 2\n"
"Found an odd number 3\n"
"Found an even number 4\n"
"Found an odd number 5\n"
"Found an even number 6\n"
"Found an odd number 7\n"
"Found an even number 8\n"
"Found an odd number 9"
msgstr ""
">>> for num in range(2, 10):\n"
"... if num % 2 == 0:\n"
"... print(f\"偶数 {num} を見つけた\")\n"
"... continue\n"
"... print(f\"奇数 {num} を見つけた\")\n"
"...\n"
"偶数 2 を見つけた\n"
"奇数 3 を見つけた\n"
"偶数 4 を見つけた\n"
"奇数 5 を見つけた\n"
"偶数 6 を見つけた\n"
"奇数 7 を見つけた\n"
"偶数 8 を見つけた\n"
"奇数 9 を見つけた"
#: ../../tutorial/controlflow.rst:202
msgid ":keyword:`!else` Clauses on Loops"
msgstr "ループの :keyword:`!else` 節"
#: ../../tutorial/controlflow.rst:204
msgid ""
"In a :keyword:`!for` or :keyword:`!while` loop the :keyword:`!break` "
"statement may be paired with an :keyword:`!else` clause. If the loop "
"finishes without executing the :keyword:`!break`, the :keyword:`!else` "
"clause executes."
msgstr ""
":keyword:`!for` または :keyword:`!while` ループ中の :keyword:`!break` 文"
"は :keyword:`!else` 節と対になる場合があります。:keyword:`!break` を実行せず"
"にループが終了すると、:keyword:`!else` 節が実行されます。"
#: ../../tutorial/controlflow.rst:208
msgid ""
"In a :keyword:`for` loop, the :keyword:`!else` clause is executed after the "
"loop finishes its final iteration, that is, if no break occurred."
msgstr ""
":keyword:`for` 文の場合、 :keyword:`!else` 節はループ処理の最後のイテレーショ"
"ンが実行されたあと、つまりbreakが発生しなかった場合に実行されます。"
#: ../../tutorial/controlflow.rst:211
msgid ""
"In a :keyword:`while` loop, it's executed after the loop's condition becomes "
"false."
msgstr ""
":keyword:`while` 文の場合は、ループ条件が偽となったあとに実行されます。"
#: ../../tutorial/controlflow.rst:213
msgid ""
"In either kind of loop, the :keyword:`!else` clause is **not** executed if "
"the loop was terminated by a :keyword:`break`. Of course, other ways of "
"ending the loop early, such as a :keyword:`return` or a raised exception, "
"will also skip execution of the :keyword:`else` clause."
msgstr ""
"どちらのループでも、ループが :keyword:`break` によって終了した場合"
"は :keyword:`!else` 句は **実行されません**。当然、 :keyword:`return` や例外"
"の発生によってループが途中で終了した場合にも、:keyword:`else` 節の実行はス"
"キップされます。"
#: ../../tutorial/controlflow.rst:218
msgid ""
"This is exemplified in the following :keyword:`!for` loop, which searches "
"for prime numbers::"
msgstr "その例として、素数を探索する :keyword:`!for` 文を以下に示します::"
msgid ""
">>> for n in range(2, 10):\n"
"... for x in range(2, n):\n"
"... if n % x == 0:\n"
"... print(n, 'equals', x, '*', n//x)\n"
"... break\n"
"... else:\n"
"... # loop fell through without finding a factor\n"
"... print(n, 'is a prime number')\n"
"...\n"
"2 is a prime number\n"
"3 is a prime number\n"
"4 equals 2 * 2\n"
"5 is a prime number\n"
"6 equals 2 * 3\n"
"7 is a prime number\n"
"8 equals 2 * 4\n"
"9 equals 3 * 3"
msgstr ""
">>> for n in range(2, 10):\n"
"... for x in range(2, n):\n"
"... if n % x == 0:\n"
"... print(n, 'equals', x, '*', n//x)\n"
"... break\n"
"... else:\n"
"... # 因数が見つからないとループは最後まで実行される\n"
"... print(n, 'is a prime number')\n"
"...\n"
"2 is a prime number\n"
"3 is a prime number\n"
"4 equals 2 * 2\n"
"5 is a prime number\n"
"6 equals 2 * 3\n"
"7 is a prime number\n"
"8 equals 2 * 4\n"
"9 equals 3 * 3"
#: ../../tutorial/controlflow.rst:239
msgid ""
"(Yes, this is the correct code. Look closely: the ``else`` clause belongs "
"to the ``for`` loop, **not** the ``if`` statement.)"
msgstr ""
"(そう、これは正しいコードです。よく見てください: ``else`` 節は ``if`` 文 **で"
"はなく** 、 ``for`` ループに属しています。)"
msgid ""
"One way to think of the else clause is to imagine it paired with the ``if`` "
"inside the loop. As the loop executes, it will run a sequence like if/if/if/"
"else. The ``if`` is inside the loop, encountered a number of times. If the "
"condition is ever true, a ``break`` will happen. If the condition is never "
"true, the ``else`` clause outside the loop will execute."
msgstr ""
"else 節を理解するには、ループ内の ``if`` と対になると考える方法があります。"
"ループが実行されるにつれて if/if/if/else のように処理が進みます。 ``if`` は"
"ループの内側にあり、何度も実行されます。条件が一度でも真になれば ``break`` が"
"実行されます。一度も真にならなければ、ループの外側にある ``else`` 節が実行さ"
"れます。"
msgid ""
"When used with a loop, the ``else`` clause has more in common with the "
"``else`` clause of a :keyword:`try` statement than it does with that of "
"``if`` statements: a ``try`` statement's ``else`` clause runs when no "
"exception occurs, and a loop's ``else`` clause runs when no ``break`` "
"occurs. For more on the ``try`` statement and exceptions, see :ref:`tut-"
"handling`."
msgstr ""
"ループの ``else`` 句は、 ``if`` 文の ``else`` よりも :keyword:`try` 文の "
"``else`` に似ています。 ``try`` 文の ``else`` 句は例外が発生しなかった時に実"
"行され、ループの ``else`` 句は ``break`` されなかった場合に実行されます。 "
"``try`` 文と例外についての詳細は :ref:`tut-handling` を参照してください。"
#: ../../tutorial/controlflow.rst:258
msgid ":keyword:`!pass` Statements"
msgstr ":keyword:`!pass` 文"
msgid ""
"The :keyword:`pass` statement does nothing. It can be used when a statement "
"is required syntactically but the program requires no action. For example::"
msgstr ""
":keyword:`pass` 文は何もしません。 ``pass`` は、文を書くことが構文上要求され"
"ているが、プログラム上何の動作もする必要がない時に使われます::"
#: ../../tutorial/controlflow.rst:263
msgid ""
">>> while True:\n"
"... pass # Busy-wait for keyboard interrupt (Ctrl+C)\n"
"..."
msgstr ""
">>> while True:\n"
"... pass # キーボード割り込み(Ctrl+C)のためのビジーウェイト\n"
"..."
#: ../../tutorial/controlflow.rst:267
msgid "This is commonly used for creating minimal classes::"
msgstr "これは最小のクラスを作るときによく使われる方法です::"
#: ../../tutorial/controlflow.rst:269
msgid ""
">>> class MyEmptyClass:\n"
"... pass\n"
"..."
msgstr ""
">>> class MyEmptyClass:\n"
"... pass\n"
"..."
#: ../../tutorial/controlflow.rst:273
msgid ""
"Another place :keyword:`pass` can be used is as a place-holder for a "
"function or conditional body when you are working on new code, allowing you "
"to keep thinking at a more abstract level. The :keyword:`!pass` is silently "
"ignored::"
msgstr ""
":keyword:`pass` のもう 1 つの使い道は、新しいコードを書いているときの関数や条"
"件文の仮置きの本体としてです。こうすることで、より抽象的なレベルで考え続けら"
"れます。\n"
":keyword:`!pass` は何事も無く無視されます ::"
#: ../../tutorial/controlflow.rst:277
msgid ""
">>> def initlog(*args):\n"
"... pass # Remember to implement this!\n"
"..."
msgstr ""
">>> def initlog(*args):\n"
"... pass # ここを忘れずに実装すること!\n"
"..."
#: ../../tutorial/controlflow.rst:281
msgid ""
"For this last case, many people use the ellipsis literal :code:`...` instead "
"of :code:`pass`. This use has no special meaning to Python, and is not part "
"of the language definition (you could use any constant expression here), "
"but :code:`...` is used conventionally as a placeholder body as well. "
"See :ref:`bltin-ellipsis-object`."
msgstr ""
"この最後の例で、多くの人は :code:`pass` ではなく省略記号リテラル :code:`...` "
"を使います。 この使い方は Python に対して特別な意味はなく、言語定義の一部でも"
"ありません（ここにはどんな定数式でも使えます）が、 :code:`...` は慣例的にプ"
"レースホルダ本体としても使われています。 :ref:`bltin-ellipsis-object` を参照"
"してください。"
#: ../../tutorial/controlflow.rst:291
msgid ":keyword:`!match` Statements"
msgstr ":keyword:`!match` 文"
msgid ""
"A :keyword:`match` statement takes an expression and compares its value to "
"successive patterns given as one or more case blocks. This is superficially "
"similar to a switch statement in C, Java or JavaScript (and many other "
"languages), but it's more similar to pattern matching in languages like Rust "
"or Haskell. Only the first pattern that matches gets executed and it can "
"also extract components (sequence elements or object attributes) from the "
"value into variables. If no case matches, none of the branches is executed."
msgstr ""
":keyword:`match` 文は式を受け取り、その値を1つ以上の case ブロックに指定され"
"たパターンと順に比較します。表面的には C、Java、JavaScript などの switch 文に"
"似ていますが、Rust や Haskell などのパターンマッチングにより近いものです。最"
"初にマッチしたパターンのブロックだけが実行されます。また、値から構成要素 "
"(シーケンスの要素やオブジェクトの属性) を取り出して変数に代入することもできま"
"す。どの case にもマッチしなければ、どの分岐も実行されません。"
msgid ""
"The simplest form compares a subject value against one or more literals::"
msgstr "最も単純な形式では、対象の値を1つ以上のリテラルと比較します。 ::"
#: ../../tutorial/controlflow.rst:304
msgid ""
"def http_error(status):\n"
" match status:\n"
" case 400:\n"
" return \"Bad request\"\n"
" case 404:\n"
" return \"Not found\"\n"
" case 418:\n"
" return \"I'm a teapot\"\n"
" case _:\n"
" return \"Something's wrong with the internet\""
msgstr ""
"def http_error(status):\n"
" match status:\n"
" case 400:\n"
" return \"Bad request\"\n"
" case 404:\n"
" return \"Not found\"\n"
" case 418:\n"
" return \"I'm a teapot\"\n"
" case _:\n"
" return \"Something's wrong with the internet\""
#: ../../tutorial/controlflow.rst:315
msgid ""
"Note the last block: the \"variable name\" ``_`` acts as a *wildcard* and "
"never fails to match."
msgstr ""
"最後のブロックについて: 変数名 ``_`` は *ワイルドカード* の働きをし、マッチに"
"絶対失敗しません。"
#: ../../tutorial/controlflow.rst:318
msgid ""
"You can combine several literals in a single pattern using ``|`` (\"or\")::"
msgstr ""
"複数のリテラルを ``|`` (\"or\")を使用して組み合わせて1つのパターンにできま"
"す::"
#: ../../tutorial/controlflow.rst:320
msgid ""
"case 401 | 403 | 404:\n"
" return \"Not allowed\""
msgstr ""
"case 401 | 403 | 404:\n"
" return \"Not allowed\""
msgid ""
"Patterns can look like unpacking assignments, and can be used to bind "
"variables::"
msgstr ""
"パターンはアンパック代入に似た形で書くことができ、変数に値を結びつけるために"
"使えます。 ::"
#: ../../tutorial/controlflow.rst:326
msgid ""
"# point is an (x, y) tuple\n"
"match point:\n"
" case (0, 0):\n"
" print(\"Origin\")\n"
" case (0, y):\n"
" print(f\"Y={y}\")\n"
" case (x, 0):\n"
" print(f\"X={x}\")\n"
" case (x, y):\n"
" print(f\"X={x}, Y={y}\")\n"
" case _:\n"
" raise ValueError(\"Not a point\")"
msgstr ""
"# point(座標) は (x, y) のタプル\n"
"match point:\n"
" case (0, 0):\n"
" print(\"原点\")\n"
" case (0, y):\n"
" print(f\"Y={y}\")\n"
" case (x, 0):\n"
" print(f\"X={x}\")\n"
" case (x, y):\n"
" print(f\"X={x}, Y={y}\")\n"
" case _:\n"
" raise ValueError(\"座標ではない\")"
#: ../../tutorial/controlflow.rst:339
msgid ""
"Study that one carefully! The first pattern has two literals, and can be "
"thought of as an extension of the literal pattern shown above. But the next "
"two patterns combine a literal and a variable, and the variable *binds* a "
"value from the subject (``point``). The fourth pattern captures two values, "
"which makes it conceptually similar to the unpacking assignment ``(x, y) = "
"point``."
msgstr ""
"このコードは注意して見てください！\n"
"最初のパターンには2つのリテラルがあり、上で示したリテラルパターンの拡張と考え"
"ることができます。\n"
"しかし次の2つのパターンはリテラルと変数の組み合わせのため、対象(``point``)か"
"ら値を取り出して変数に *結びつけ* ます。\n"
"4番目のパターンは2つの値を取り込みます。\n"
"これは、アンパック代入 ``(x, y) = point`` と概念的に似ています。"
msgid ""
"If you are using classes to structure your data you can use the class name "
"followed by an argument list resembling a constructor, but with the ability "
"to capture attributes into variables::"
msgstr ""
"データを構造化するためにクラスを使っている場合は、クラス名の後にコンストラク"
"ターに似た引数リストを指定できます。これにより属性の値を変数に取り込めま"
"す。 ::"
#: ../../tutorial/controlflow.rst:350
msgid ""
"class Point:\n"
" def __init__(self, x, y):\n"
" self.x = x\n"
" self.y = y\n"
"\n"
"def where_is(point):\n"
" match point:\n"
" case Point(x=0, y=0):\n"
" print(\"Origin\")\n"
" case Point(x=0, y=y):\n"
" print(f\"Y={y}\")\n"
" case Point(x=x, y=0):\n"
" print(f\"X={x}\")\n"
" case Point():\n"
" print(\"Somewhere else\")\n"
" case _:\n"
" print(\"Not a point\")"
msgstr ""
"class Point:\n"
" def __init__(self, x, y):\n"
" self.x = x\n"
" self.y = y\n"
"\n"
"def where_is(point):\n"
" match point:\n"
" case Point(x=0, y=0):\n"
" print(\"原点\")\n"
" case Point(x=0, y=y):\n"
" print(f\"Y={y}\")\n"
" case Point(x=x, y=0):\n"
" print(f\"X={x}\")\n"
" case Point():\n"
" print(\"それ以外のどこか\")\n"
" case _:\n"
" print(\"座標ではない\")"
msgid ""
"You can use positional parameters with some builtin classes that provide an "
"ordering for their attributes (e.g. dataclasses). You can also define a "
"specific position for attributes in patterns by setting the "
"``__match_args__`` special attribute in your classes. If it's set to (\"x\", "
"\"y\"), the following patterns are all equivalent (and all bind the ``y`` "
"attribute to the ``var`` variable)::"
msgstr ""
"属性の順序が定まっている一部の組み込みクラス (データクラスなど) では位置引数"
"を使えます。自分のクラスに ``__match_args__`` 特殊属性を設定して、パターン内"
"での各属性の位置を定義することもできます。この属性を (\"x\", \"y\") に設定す"
"ると、次のパターンはすべて等価になります (いずれも ``y`` 属性の値を ``var`` "
"変数に結びつけます)。 ::"
#: ../../tutorial/controlflow.rst:374
msgid ""
"Point(1, var)\n"
"Point(1, y=var)\n"
"Point(x=1, y=var)\n"
"Point(y=var, x=1)"
msgstr ""
"Point(1, var)\n"
"Point(1, y=var)\n"
"Point(x=1, y=var)\n"
"Point(y=var, x=1)"
#: ../../tutorial/controlflow.rst:379
msgid ""
"A recommended way to read patterns is to look at them as an extended form of "
"what you would put on the left of an assignment, to understand which "
"variables would be set to what. Only the standalone names (like ``var`` "
"above) are assigned to by a match statement. Dotted names (like "
"``foo.bar``), attribute names (the ``x=`` and ``y=`` above) or class names "
"(recognized by the \"(...)\" next to them like ``Point`` above) are never "
"assigned to."
msgstr ""
"おすすめのパターンの読み方は、パターンが、代入文の左辺に配置するものを拡張し"
"た形式であるとみなすことです。\n"
"これにより、どの変数になにが代入されるかが分かります。\n"
"単独の名前（上記の ``var`` など）だけがマッチ文で値が代入されます。ドット付き"
"の名前（``foo.bar`` など）、属性名（上記の ``x=``、``y=`` など ）、クラス名"
"（名前の後ろの \"(...)\" によって判別される。上記の ``Point`` など）には値は"
"代入されません。"
msgid ""
"Patterns can be arbitrarily nested. For example, if we have a short list of "
"Points, with ``__match_args__`` added, we could match it like this::"
msgstr ""
"パターンは任意にネストできます。\n"
"例えば、``__match_args__`` を追加した ``Point`` クラスのインスタンスからなる"
"短いリストがある場合、次のようにマッチできます。 ::"
#: ../../tutorial/controlflow.rst:389
msgid ""
"class Point:\n"
" __match_args__ = ('x', 'y')\n"
" def __init__(self, x, y):\n"
" self.x = x\n"
" self.y = y\n"
"\n"
"match points:\n"
" case []:\n"
" print(\"No points\")\n"
" case [Point(0, 0)]:\n"
" print(\"The origin\")\n"
" case [Point(x, y)]:\n"
" print(f\"Single point {x}, {y}\")\n"
" case [Point(0, y1), Point(0, y2)]:\n"
" print(f\"Two on the Y axis at {y1}, {y2}\")\n"
" case _:\n"
" print(\"Something else\")"
msgstr ""
"class Point:\n"
" __match_args__ = ('x', 'y')\n"
" def __init__(self, x, y):\n"
" self.x = x\n"
" self.y = y\n"
"\n"
"match points:\n"
" case []:\n"
" print(\"座標が存在しない\")\n"
" case [Point(0, 0)]:\n"
" print(\"原点\")\n"
" case [Point(x, y)]:\n"
" print(f\"1つの座標 {x}, {y}\")\n"
" case [Point(0, y1), Point(0, y2)]:\n"
" print(f\"Y軸の {y1}, {y2} に2つの座標\")\n"
" case _:\n"
" print(\"それ以外のどこか\")"
msgid ""
"We can add an ``if`` clause to a pattern, known as a \"guard\". If the "
"guard is false, ``match`` goes on to try the next case block. Note that "
"value capture happens before the guard is evaluated::"
msgstr ""
"パターンには「ガード」と呼ばれる ``if`` 節を追加できます。ガードが偽なら、"
"``match`` は次の case ブロックのパターンとのマッチを試みます。値の取り込みは"
"ガードの評価より前に行われることに注意してください。 ::"
#: ../../tutorial/controlflow.rst:411
msgid ""
"match point:\n"
" case Point(x, y) if x == y:\n"
" print(f\"Y=X at {x}\")\n"
" case Point(x, y):\n"
" print(f\"Not on the diagonal\")"
msgstr ""
"match point:\n"
" case Point(x, y) if x == y:\n"
" print(f\"Y=X at {x}\")\n"
" case Point(x, y):\n"
" print(f\"対角線上ではない\")"
msgid "Several other key features of this statement:"
msgstr "この文には、ほかにも次のような重要な特徴があります:"
#: ../../tutorial/controlflow.rst:419
msgid ""
"Like unpacking assignments, tuple and list patterns have exactly the same "
"meaning and actually match arbitrary sequences. An important exception is "
"that they don't match iterators or strings."
msgstr ""
"アンパック代入のように、タプルとリストのパターンでは正確に同じ意味で、任意の"
"シーケンスと一致します。重要な例外として、イテレーターや文字列ではマッチしま"
"せん。"
#: ../../tutorial/controlflow.rst:423
msgid ""
"Sequence patterns support extended unpacking: ``[x, y, *rest]`` and ``(x, y, "
"*rest)`` work similar to unpacking assignments. The name after ``*`` may "
"also be ``_``, so ``(x, y, *_)`` matches a sequence of at least two items "
"without binding the remaining items."
msgstr ""
"シーケンスパターンは拡張アンパックをサポート: ``[x, y, *rest]`` と ``(x, y, "
"*rest)`` はアンパック代入として同じように動作します。``*`` のあとの変数名は "
"``_`` でもよく、そのため ``(x, y, *_)`` は最低でも2つのアイテムを持つシーケン"
"スにマッチし、残りのアイテムは変数に結びつけられません。"
#: ../../tutorial/controlflow.rst:428
msgid ""
"Mapping patterns: ``{\"bandwidth\": b, \"latency\": l}`` captures the "
"``\"bandwidth\"`` and ``\"latency\"`` values from a dictionary. Unlike "
"sequence patterns, extra keys are ignored. An unpacking like ``**rest`` is "
"also supported. (But ``**_`` would be redundant, so it is not allowed.)"
msgstr ""
"マッピングパターン: ``{\"bandwidth\": b, \"latency\": l}`` は辞書から "
"``\"bandwidth\"`` と ``\"latency\"`` の値を取り込みます。シーケンスパターンと"
"は異なり、それ以外のキーは無視されます。アンパッキングのような ``**rest`` も"
"サポートされています（しかし、 ``**_`` は冗長なため禁止されています）。"
msgid "Subpatterns may be captured using the ``as`` keyword::"
msgstr ""
"``as`` キーワードを使うと、サブパターンにマッチした値を変数に取り込めま"
"す。 ::"
#: ../../tutorial/controlflow.rst:435
msgid "case (Point(x1, y1), Point(x2, y2) as p2): ..."
msgstr "case (Point(x1, y1), Point(x2, y2) as p2): ..."
#: ../../tutorial/controlflow.rst:437
msgid ""
"will capture the second element of the input as ``p2`` (as long as the input "
"is a sequence of two points)"
msgstr ""
"この例では入力から2番目の要素を ``p2`` として取り込みます（入力が2つのポイン"
"トのシーケンスである場合）"
msgid ""
"Most literals are compared by equality, however the singletons ``True``, "
"``False`` and ``None`` are compared by identity."
msgstr ""
"ほとんどのリテラルは値が等しいかどうかで比較しますが、シングルトンの "
"``True``、``False``、``None`` は同一のオブジェクトかどうかで比較します。"
msgid ""
"Patterns may use named constants. These must be dotted names to prevent "
"them from being interpreted as capture variables::"
msgstr ""
"名前付きの定数もパターンで使えます。値を取り込む変数と解釈されないよう、ドッ"
"トを含む名前にする必要があります。 ::"
#: ../../tutorial/controlflow.rst:446
msgid ""
"from enum import Enum\n"
"class Color(Enum):\n"
" RED = 'red'\n"
" GREEN = 'green'\n"
" BLUE = 'blue'\n"
"\n"
"color = Color(input(\"Enter your choice of 'red', 'blue' or 'green': \"))\n"
"\n"
"match color:\n"
" case Color.RED:\n"
" print(\"I see red!\")\n"
" case Color.GREEN:\n"
" print(\"Grass is green\")\n"
" case Color.BLUE:\n"
" print(\"I'm feeling the blues :(\")"
msgstr ""
"from enum import Enum\n"
"class Color(Enum):\n"
" RED = 'red'\n"
" GREEN = 'green'\n"
" BLUE = 'blue'\n"
"\n"
"color = Color(input(\"Enter your choice of 'red', 'blue' or 'green': \"))\n"
"\n"
"match color:\n"
" case Color.RED:\n"
" print(\"I see red!\")\n"
" case Color.GREEN:\n"
" print(\"Grass is green\")\n"
" case Color.BLUE:\n"
" print(\"I'm feeling the blues :(\")"
#: ../../tutorial/controlflow.rst:462
msgid ""
"For a more detailed explanation and additional examples, you can look "
"into :pep:`636` which is written in a tutorial format."
msgstr ""
"より詳細な説明と追加の例は :pep:`636` にチュートリアル形式で記述してありま"
"す。"
#: ../../tutorial/controlflow.rst:468
msgid "Defining Functions"
msgstr "関数を定義する"
#: ../../tutorial/controlflow.rst:470
msgid ""
"We can create a function that writes the Fibonacci series to an arbitrary "
"boundary::"
msgstr ""