March 2018
Beginner to intermediate
624 pages
16h 10m
Japanese
Content preview from Head First Python 第2版 ―頭とからだで覚えるPythonの基本
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2
オブジェクト
1
オブジェクト
0
オブジェクト
タプル
なぜ？
に答えます
タプルの存在理由
Python
経験の浅いほとんどの人は、タプルを初めて見たときに、なぜこの
ようなデータ構造がそもそも存在するのか疑問に思うようです。タプルは一
度作成してデータを入れたら、変更できないリストのようなものです。実
際、タプルは不変です。つまり、変更できないのです。では、なぜタプルが必
要なのでしょうか？
不変データ構造は実はとても便利です。副作用を防ぐために、プログラム
内のデータを変更されないようにする場合や、大きな定数リストがある場合
（変更がないことがわかっている）、性能が気になる場合もあるでしょう。変
更するつもりがないのに、なぜ余計な（可変）リスト処理を使うのでしょう
か？
このような場合にタプルを使うと不要なオーバーヘッドがなくなり、
（以前なら生じていた）データの副作用を防いでくれます。
コード内のタプルの見分け方
タプルはリストと密接な関係があるので、似て見える（そして、同様に振
る舞う
）のも当然です。タプルは丸かっこで囲むのに対し、リストは角かっ
こを使います。
>>>
プロンプトを使ってタプルとリストを比較できます。な
お、
type
組み込み関数を使って作成したオブジェクトの型を確認していま
す。
Q
：「タプル」という名前はどこから来て
いるのですか？
A
：これは誰に聞くかによりますが、この名
前の起源は数学にあります。
https://
en.wikipedia.org/wiki/Tuple
を 調 べ
ると知りたいと思
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.