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
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.
162
6 章 Scrapy を使った重量スクレイピング
❷ 画像
URL
リクエストを実行した後に、その結果を
item_completed
メソッドに渡す。
❸ この
Python
リスト内包表記は、成功した（
[(True, Image), (False, Image) ...]
形式の）結果タプル
のリストを抽出し、
settings.py
の
IMAGES_STORE
変数で指定したディレクトリに対する相対ファイルパ
スを格納する。
スパイダーとパイプラインが定義できました。あとはこのパイプラインを
settings.py
モジュー
ルに追加し、
IMAGES_STORE
変数に画像を保存したいディレクトリを設定するだけです。
# nobel_winners/nobel_winners/settings.py
...
ITEM_PIPELINES = {'nobel_winners.pipelines'\
'.NobelImagesPipeline':1}
IMAGES_STORE = 'images'
プロジェクトの
nobel_winners
ルートディレクトリからこの新しいスパイダーを実行し、出力
を確認してみましょう。
$ scrapy crawl nwinners_minibio -o minibios.json
...
2015-... DEBUG: Scraped from <200 http:.../Albert_Claude>
{'image_urls': [],
'link': u'http://en.wikipedia.org/wiki/Albert_Claude', ...
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.