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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10
章 関数デコレータ
you are here
397
関数デコレータを作成する
395
ページの「デコレータ作成手順」の手順
1
に従い、新たな関数を作成します。
1
デコレータは関数
実際に、インタプリタから見たら、デコレータは既存関数を操作するとはいえ普通の関数
です。今後は、この既存関数をデコレートされる関数と呼びましょう。この本をここまで
読んできたので、関数の作成は簡単であることがわかっています。
Python
の
def
キーワー
ドを使うのです。
第
2
項目に従うには、デコレータが引数として関数オブジェクトを取るようにする必要があります。
2
デコレータは引数としてデコレートされる関数を取る
デコレータは引数としてデコレートされる関数を取る必要があります。そのためには、デ
コレータに関数オブジェクトとしてデコレートされる関数を渡すだけです。ここまでの
10
ページで取り組んできたので、これも簡単であることがわかっています。丸かっこなしで
（つまり、関数の名前だけを使って）関数を参照すれば関数オブジェクトになります。
デコレータを専用のモジュールに入れましょう（再利用がより簡単になります）。ま
ず、テキストエディタで新たなファイル
checker.py
を作成します。
checker.py
に新たなデコレータ
check_logged_in
を作成します。次の空欄
にデコレータの
def
行を書いてください。ヒント：関数オブジェクト引数の名前と
して
func
を使います。
ここにデコレータの
def
行を書きます。
Q
：
chec ...
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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.