September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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20
第 2 章 Python の実行
2.6
リストとタプル
リストとタプルはどちらもオブジェクトの配列を管理するデータ構造で、整数値の索引で要素を
指定してアクセスします。タプルは更新不能なオブジェクトで、後から要素を追加したり変更した
りできませんが、辞書のキーとして使用できます。リストは更新可能ですが、辞書のキーとしては
指定できません。リストオブジェクトは、
[
要素
,
要素
, ...]
のように、
[
と
]
で要素を囲んで作成します。要素の無い、空のリストは
[]
と記述します。
L = [1, 2, 3] # L
は
3
つの整数値からなるリスト
L = [] # L
は空
(=
要素のない
)
のリスト
L = [1, 'Two', [3, 4, 5]] # L
は整数の
1,
文字列
'Two'
、リスト
[3,4,5]
のリスト
タプルオブジェクトは、
要素
,
要素
, ...
のように、要素を
,
で区切って作成します。タプルを作成するときは、前後を
()
で囲んで
(
要素
,
要素
, ...)
のように記述することがほとんどですが、このカッコは式を読みやすくするためのもので、必須
ではありません。ただし、要素のない、空のタプルを作成するときには、必ずカッコを使って
()
と記述します。
t = (1, 2, 3) # t
は
3
つの整数値からなるタプル
t = 1, 2, 3 # t
は
3
つの整数値からなるタプル
t = () # t
は空
(=
要素のない
)
のタプル
t = (1, 'Two', [3, 4, 5]) # t
は整数の
1,
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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.