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.
530
付録
B
IPython
システム上級編
コマンド 説明
%dhist
ディレクトリの訪問履歴を表示する。
%env
システム環境変数の一覧をディクショナリオブジェクトとして返す。
%matplotlib
matplotlib
環境の有効化。
B.2.1
シェルコマンドとエイリアス（別名定義）
IPython
への入力行を感嘆符（
!
）で始めた場合、
IPython
は感嘆符より後ろのすべての文字列をシス
テムのシェルで実行します。つまり、
IPython
上でファイルの削除（
Unix
では
rm
、
Windows
では
del
な
ど）、ディレクトリの変更、別プロセスの実行などが可能になります。
コンソールに出力されるシェルコマンドの結果を
Python
の変数に保管することができます。これに
は、変数の値に
!
表記のコマンドを指定します。例えば著者の環境はイーサネット接続された
Linux
ベースのマシンです。この
IP
アドレスを
Python
変数として保管するには次のようにします。
In [1]: ip_info = !ifconfig wlan0 | grep "inet "
In [2]: ip_info[0].strip()
Out[2]: 'inet addr:10.0.0.11 Bcast:10.0.0.255 Mask:255.255.255.0'
変数
ip_info
は、コンソール出力保管のために用意されたカスタム型からなるオブジェクトです。こ
れは、さまざまなコンソール出力を格納できるようにした独自のリスト型です。
また、
IPyt ...
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.