September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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.
269
7.6 ディスクリプタ
ディスクリプタは、以下のメソッドを実装します。
descr.__get__(
self
,
obj
,
objtype=None
)
obj.ATTR
で、属性として参照される時に呼び出されます。戻り値として、属性の値を返します。
パラメタ
obj
−
属性が属するインスタンスを指定します。
objtype
−
インスタンスの型を指定します。
descr.__set__(
self
,
obj
,
value
)
obj.ATTR = value
で、属性値を設定するときに呼び出されます。
パラメタ
obj
−
属性が属するインスタンスを指定します。
value
−
属性値を指定します。
descr.__delete__(
self
,
obj
)
del obj.ATTR
で、属性値を削除するときに呼び出されます。
パラメタ
obj
−
属性が属するインスタンスを指定します。
7.6.2
メソッドオブジェクト
ディスクリプタには色々な種類がありますが、代表的なディスクリプタに、関数オブジェクトが
あります。
クラス定義の内部で定義した関数は、クラスの属性として登録されます。登録した関数を、クラ
スの属性値として参照すると、その関数オブジェクトをそのまま取得できます。
>>> class Spam:
... def ham():pass
...
>>> Spam.ham # Spam
クラスから関数を取得
<function Spam.ham at 0x10e7ae9e0>
>>> type(Spam.ham)
<class 'function'> ...
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.