April 2019
Intermediate to advanced
320 pages
6h 42m
English
Content preview from Python Machine Learning
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.
CHAPTER 3Manipulating Tabular Data Using Pandas
What Is Pandas?
While NumPy arrays are a much‐improved N‐dimensional array object version over Python's list, it is insufficient to meet the needs of data science. In the real world, data are often presented in table formats. For example, consider the content of the CSV file shown here:
,DateTime,mmol/L0,2016-06-01 08:00:00,6.11,2016-06-01 12:00:00,6.52,2016-06-01 18:00:00,6.73,2016-06-02 08:00:00,5.04,2016-06-02 12:00:00,4.95,2016-06-02 18:00:00,5.56,2016-06-03 08:00:00,5.67,2016-06-03 12:00:00,7.18,2016-06-03 18:00:00,5.99,2016-06-04 09:00:00,6.610,2016-06-04 11:00:00,4.111,2016-06-04 17:00:00,5.912,2016-06-05 08:00:00,7.613,2016-06-05 12:00:00,5.114,2016-06-05 18:00:00,6.915,2016-06-06 08:00:00,5.016,2016-06-06 12:00:00,6.117,2016-06-06 18:00:00,4.918,2016-06-07 08:00:00,6.619,2016-06-07 12:00:00,4.120,2016-06-07 18:00:00,6.921,2016-06-08 08:00:00,5.622,2016-06-08 12:00:00,8.123,2016-06-08 18:00:00,10.924,2016-06-09 08:00:00,5.225,2016-06-09 12:00:00,7.126,2016-06-09 18:00:00,4.9
The CSV file contains rows of data that are divided into three columns—index, date and time of recording, and blood glucose readings in mmol/L. To be able to deal with data stored as tables, you need a new data type that is more suited to deal with it—Pandas. While Python supports lists and dictionaries for manipulating structured data, it is not well suited for manipulating numerical tables, such as the one stored in the CSV ...
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.