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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さらにオブジェクトを使う
CountFromBy
でさらに処理を行う
前ページの最後の
CountFromBy
の使用例ではデフォルトの振る舞いを示しました。特に
指定しない限り、
CountFromBy
オブジェクトのカウンタの開始値は
0
で、
1
ずつ増えます。
別の開始値を指定することも可能です。次の例では
100
からカウントを開始します。
>>> d = CountFromBy(100)
>>> d
100
>>> d.increase()
>>> d.increase()
>>> d.increase()
>>> d
103
開始値は
100
新しいオブジェクトを
生成するときに開始値を指定。
increase
メソッドを呼び出し、
毎回カウンタの値を
1
増やします。
increase
メソッドを
3
回呼び出すと、
オブジェクト
d
の値は
103
になります。
開始値の指定だけでなく、増分量も指定できます。次のコードでは開始値
100
から始め、
10
ずつ増やしています。
>>> e = CountFromBy(100, 10)
>>> e
100
>>> for i in range(3):
e.increase()
>>> e
130
e
は
100
から
開始、最終的に
130
になります。
開始値と増分量を
両方指定します。
for
ループ内で
increase
メソッドを
3
回
呼び出し、毎回
e
の値を
10
ずつ増やします。
下の最後の例では、カウンタはデフォルトの
0
から開始されていますが、
15
ずつ増えます。
クラスの引数として
(0, 15)
を指定する代わりに、この例では増やす量を指定できるキー ...
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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.