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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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.
サラの番
186
4
章
トムの関数
サラの関数
mystery.py
モジュール
参照渡しのデモ
トムは自分が優位であることをアピールしていますが、サラは落ち着いて椅子に座り、シェ
ルに入力する準備をしています。
IDLE
の編集ウィンドウのコードをもう一度示します。サラの
change
関数はいつでも実行可能です。
サラは
>>>
プロンプトに数行のコードを入力したあと椅子の背にもたれて腕を組み、「
Python
が
値呼び出しだけをサポートするなら、この振る舞いはどう説明するの？」とトムに言います。トム
は何も言えません。
サラがシェルに行った操作を確認してみましょう。
>>> numbers = [ 42, 256, 16 ]
>>> change(numbers)
実行前：
[42, 256, 16]
実行後：
[42, 256, 16, '
さらなるデータ
']
>>> numbers
[42, 256, 16, '
さらなるデータ
']
サラは、トムと同じ
リスト型のデータを
使って
change
関数を
呼び出しています。
何が起こったのでしょうか。
今回は引数の値が関数内と
シェルの両方で変更されて
います。これは、
Python
関数が参照渡しもサポート
しているように思えます。
おかしな振る舞いです。
トムの関数は明らかに値渡しを行っているのに対し、サラの関数は参照渡しを行っています。
どうしてこのようなことが起こるのでしょうか？
Python
は両方をサポートしているのでしょ
うか？
解決：おかしな振る舞いをする関数引数事件
Python
の関数引 ...
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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.