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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リストの拡張
4
オブジェクト
3
オブジェクト
2
オブジェクト
1
オブジェクト
0
オブジェクト
リスト
3
extend
：唯一の引数としてオブジェクトのリストを取る
extend
メソッドは
2
つ目のリストを取り、そのリストの各オブ
ジェクトを既存のリストに追加します。
2
つのリストを
1
つに結合
したいときにとても便利です。
2
2 3 4
2 3 4
現在の
nums
リスト。
要素は
1
つです。
>>> nums.extend([3, 4])
[2, 3, 4]
既存のリストに
追加するオブジェクトの
リストを指定します。
指定したリストの
各オブジェクトを追加して
nums
リストを拡張して
います。
>>> nums.extend([])
[2, 3, 4]
少し変でも（既存のリストの末尾に何も
要素を追加しないので）、空のリストを
使うことは有効です。代わりに
append([])
を呼び出すと、既存の
リストの末尾に空のリストを追加します
が、この例では
extend([])
を使って
いるので何も行いません。
nums
リストを拡張するために
使った空のリストはオブジェクトを
含まないので、変化はありません。
64
2
章
リストをオブジェクトで拡張する
append
を使うと既存のリストに
1
つのオブジェクトを追加できることはもう知って
いますね。別のメソッドでもリストに動的にデータを追加できます。
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.