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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関数はオブジェクト
関数に関数を渡す。
関数から関数を返す。
任意の数のあらゆる型
の引数を処理。
386
10
章
この課題に挑戦し、
完了した項目にチェック
マークを付けましょう。
組み込み関数
id
は、
指定したオブジェクトの
識別子を表示します。
組み込み関数
type
は
オブジェクトの型を
表示します。
関数に関数を渡す
2
章で、
Python
の「すべてがオブジェクトである」という考え方を紹介しました。これは
直感的にはわかりにくいかもしれませんが、「すべて」には関数も含まれるので、関数もオ
ブジェクトです。
当然のことですが、関数を呼び出すと関数が動作します。しかし、
Python
のその他のす
べてのものと同様に関数はオブジェクトなので、オブジェクト
ID
を持ちます。関数は「関
数オブジェクト」と考えてください。
下の短い
IDLE
セッションを見てください。変数
msg
に文字列を代入し、組み込み関数
id
を呼び出すとオブジェクト
ID
が表示されます。そして、
hello
という小さな関数を定
義します。次に、関数のオブジェクト
ID
を表示する組み込み関数
id
に関数
hello
を渡
します。組み込み関数
type
で
msg
が文字列で
hello
が関数であることを確認し、最後
に
hello
を呼び出して
msg
の現在の値を出力します。
上の
IDLE
セッションを見せる前はここに着目しないように少しごまかしていましたが、
組み込み関数
id
と組み込み関数
type
にどのように
hello
を渡したか気付きましたか？
hello
を呼び出してはいません。それぞれの関 ...
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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.