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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
plist
の操作
「
plist
」に何があったのか？
（続き）
panic.py
を実行すると
plist
に実際に何が起こるのかを考えて
います。
前ページのコードを実行した結果、現在は文字
o
、
n
、
t
、スペース、
p
、
a
の
6
つの要素が残っています。実行を続けましょう。
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
plist.extend([plist.pop(), plist.pop()])
plist.insert(2, plist.pop(3))
new_phrase = ''.join(plist)
print(plist)
print(new_phrase)
前ページのコードを実行した結果、
plist
は次のように
なっています。
次の行では 3 つのメソッドを呼び出しています。
2
つの
pop
メソッドと
1
つの
extend
メソッドです。
pop
が先
に呼び出されます（左から右の順）。
extend
メソッドは、取り出したオブジェクトを
plist
の最後に追加します。
extend
は、
append
メソッドの
複数呼び出しの省略形と考えると便利です。
あとは、（
plist
の）インデックス
2
の文字
t
をインデック
ス
3
のスペース文字と入れ替えるだけです。次の行では 2
つのメソッドを呼び出しています。まず
pop
を使ってス
ペ
ース文字を取り出します。
そして、
insert
メソッドでスペース文字を正しい位置
（インデックス
2
の前）に入れます。
ジャーン！
コード
plist
の状態
70
2
章
print
関数を呼び出して、 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.