September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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79
4.2 リスト
逆に
not in
演算子は、左項のオブジェクトと同じ値が、右項のシーケンスに含まれない場合
に、
True
を返します。
>>> 'D' not in ['A', 'B', 'C']
True
4.1.5.4
シーケンスの要素の数は、組み込み関数
len()
で取得します。
len(
object
)
object
の要素数を返します。
パラメタ
object
−
要素数を取得するオブジェクトを指定します。
>>> L = ['a', 'b', 'c']
>>> len(L)
3
4.2
リスト
リストは、自由に要素の追加や削除、入れ替えなどを行えるシーケンスオブジェクトで、
Python
のどのようなオブジェクトでも、自由に要素として登録できます。また、異なる型のオブ
ジェクトであっても、ひとつのリストに混在できます。
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
4.2.1
リストの要素
リストは、要素として、他のオブジェクトへの参照を持ちます。例えば、
[1, 2]
というリスト
オブジェクトは、値が
1
の整数オブジェクトへの参照と、値が
2
の整数オブジェクトへの参照を
持っています。 ...
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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.
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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.