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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セッションを好きになろう
Flask
のセッションはステータスを加える
Flask
のセッションを使うには、まず
flask
モジュールから
session
をインポートします。先
ほど示した
quick_session.py
では、これを
1
行目で行っています。
session
は、
Web
アプリ
ケーションのステータスを格納する
Python
の辞書と考えてください（強力な機能を持つ辞書ではあ
りますが）。
from flask import Flask, session
...
Web
アプリケーションは依然としてステートレス
Web
で動作していますが、この
1
行のインポー
トでステータスを記憶できるようになります。
Flask
は、
session
に格納されたデータが
Web
アプリケーションの動作中はずっと存在するこ
とを保証します（
Web
サーバが
Web
アプリケーションコードのロードとリロードを何度行っても）。
さらに、
session
に格納されたデータは一意のブラウザ
cookie
でキー付けされるため、セッショ
ンデータは
Web
アプリケーションの他のすべてのユーザのセッションデータと区別されます。
Flask
が上のすべてをどのように行うかは重要ではありません。これを行っているということが重
要なのです。この優れた追加機能を有効にするには、
Flask
の
cookie
生成のために「秘密鍵」を提供す
る必要があります。秘密鍵は、
Flask
が
cookie
を暗号化して詮索の目から
cookie
を守るために使いま
す。
quick_session.py ...
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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.