Book Image

Pandas 1.x Cookbook - Second Edition

By : Matt Harrison, Theodore Petrou
Book Image

Pandas 1.x Cookbook - Second Edition

By: Matt Harrison, Theodore Petrou

Overview of this book

The pandas library is massive, and it's common for frequent users to be unaware of many of its more impressive features. The official pandas documentation, while thorough, does not contain many useful examples of how to piece together multiple commands as one would do during an actual analysis. This book guides you, as if you were looking over the shoulder of an expert, through situations that you are highly likely to encounter. This new updated and revised edition provides you with unique, idiomatic, and fun recipes for both fundamental and advanced data manipulation tasks with pandas. Some recipes focus on achieving a deeper understanding of basic principles, or comparing and contrasting two similar operations. Other recipes will dive deep into a particular dataset, uncovering new and unexpected insights along the way. Many advanced recipes combine several different features across the pandas library to generate results.
Table of Contents (17 chapters)
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Comparing row filtering and index filtering

It is possible to replicate specific cases of Boolean selection by taking advantage of the index.

In this recipe, we use the college dataset to select all institutions from a particular state with both Boolean indexing and index selection and then compare each of their performances against one another.

Personally, I prefer to filter by columns (using Boolean arrays) rather than on the index. Column filtering is more powerful as you can use other logical operators and filter on multiple columns.

How to do it…

  1. Read in the college dataset and use Boolean indexing to select all institutions from the state of Texas (TX):
    >>> college = pd.read_csv("data/college.csv")
    >>> college[college["STABBR"] == "TX"].head()
                                INSTNM  ...        GRAD_/_SUPP
    3610  Abilene Christian University  ...              25985
    3611       Alvin Community College...