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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found
o
u
a
i
e
0
0
0
0
0
頻度を更新する
頻度を更新するコードを書く前に、辞書の初期化コードを実行した後にメモ
リ内で
found
辞書がインタプリタにどのように見えているかを考えます。
すべての値を
最初は
0
に設定。
頻度が
0
に初期化されているので、特定の値を簡単に増やすことができます。
例えば、以下は
e
の頻度を増やす方法です。
>>> found
{'o': 0, 'u': 0, 'a': 0, 'i': 0, 'e': 0}
>>> found['e'] = found['e'] + 1
>>> found
{'o': 0, 'i': 0, 'a': 0, 'u': 0, 'e': 1}
上のハイライトされたコードは正しく動作しますが、代入演算子の両側に
found['e']
を書く方法は時代遅れです。そこで、この演算をもっと簡単にし
たものを次のページで紹介します。
3
章 構造化データ
you are here
105
キー
No4
オブジェクト
キー
No1
オブジェクト
キー
No3
オブジェクト
キー
No2
オブジェクト
辞書
found
o
u
a
i
e
0
0
0
0
1
すべてが
0
。
e
のカウントを
1
増やします。
辞書が更新されました。
「
e
」に対応する値が
1
増えています。
プラスイコール
頻度を更新する
v2.0
代入演算子（
=
）の両側に
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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.