August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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130
5 章 Python による Web からのデータの取得
5.7.3
受賞者国籍のスクレイピング
キャッシュが準備できたので、実験として最初の
50
人を使って受賞者の国籍を取得してみま
しょう。
get_winner_nationality()
関数は以前に格納した受賞者リンクを使って各ページをスク
レイピングし、図
5-3
に示す情報ボックスから
Nationality
属性を取得します。■
スクレイピング時には、信頼できるパターンを探して役立つデータを持つ要素を反復処理します。す
ぐにわかるように、Wikipedia での個人の情報ボックスは信頼できる情報源ではありません。無作為
にいくつかのリンクをクリックすると確かにそのような印象を持ちます。データセットの大きさによっ
ては、一部分でも正当性の確認を行うとよいでしょう。これは手動で実行できますが、本章の最初で
述べたように技能スキルの向上や改善にはなりません。
例
5-3
は過去にスクレイピングした受賞者ディクショナリの
1
つを取り、
Nationality
キーを持
つ名前ラベル付きディクショナリ（
Nationality
がある場合）を返します。これを最初の
50
人の
受賞者に対して実行し、
Nationality
属性がない頻度を調べてみましょう。
例
5-3
人物情報ページからの受賞者国籍のスクレイピング
def get_winner_nationality(w):
"""
受賞者の
Wikipedia
ページから人物情報データをスクレイピングする
"""
data = get_url('http://en.wikipedia.org' ...
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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.