April 2015
Beginner to intermediate
504 pages
8h 36m
English
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Stacking and unstacking
Similar to the pivot function are the .stack() and .unstack() methods that are part of both Series and DataFrame objects. The process of stacking pivots a level of column labels to the row index. Unstacking performs the opposite, pivoting a level of the row index into the column index.
One of the differences between stacking/unstacking and performing a pivot is that unlike pivots the stack and unstack functions will be able to pivot specific levels of a hierarchical index. Also, where a pivot retains the same number of levels on an index, a stack and unstack will always increase the levels on the index of one of the axes (columns for unstack and rows for stack) and decrease the levels on the other axis.
The reasons for stacking ...
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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.