July 2018
Intermediate to advanced
596 pages
13h 35m
Japanese
Content preview from Pythonによるデータ分析入門 第2版 ―NumPy、pandasを使ったデータ処理
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.
66
3
章
Python
組み込みのデータ構造と関数、ファイルの扱い
のように記述できます
＊
1
。
In [96]: pitchers = [('Nolan', 'Ryan'), ('Roger', 'Clemens'),
....: ('Schilling', 'Curt')]
In [97]: first_names, last_names = zip(*pitchers)
In [98]: first_names
Out[98]: ('Nolan', 'Roger', 'Curt')
In [99]: last_names
Out[99]: ('Ryan', 'Clemens', 'Schilling')
3.1.3.4
reversed
関数
reversed
関数は、特定のシーケンスを逆順に逐次処理します。
In [100]: list(reversed(range(10)))
Out[100]: [9, 8, 7, 6, 5, 4, 3, 2,
1, 0]
reversed
はジェネレータ（後ほど詳しく説明します）であると覚えておいてください。したがって、
実体化される（例えば、
list
関数や
for
ループで使われる）までは、逆順のシーケンスを生成すること
はありません。
3.1.4
ディクショナリ
ディクショナリ
は、最も重要な
Python
組み込みのデータ構造と言えるようなものです。ディクショ
ナリのより一般的な言い方には、ハッシュマップや連想配列といったものもあります。ディクショナリ
は、キー・バリュー（key-valu ...
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.