April 2015
Beginner to intermediate
504 pages
8h 36m
English
Content preview from Learning PandasBecome 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,
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After the grouping is performed, we have the ability to perform either aggregate calculations on each group of data resulting in a single value from each group, or to apply a transformation to each item in a group and return the combined result for each group. We can also filter groups based on results of expressions to exclude the groups from being included in the combined results.
Applying aggregation functions to groups
pandas allows the application of an aggregation function to each group of data. Aggregation is performed using the .aggregate() (or in short, .agg()) method of the GroupBy object. The parameter of .agg() is a reference to a function that is applied to each group. In the case of DataFrame, the function will be applied to ...
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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.