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Pandas 1.x Cookbook

Pandas 1.x Cookbook

By : Matthew Harrison, Theodore Petrou
4.5 (28)
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Pandas 1.x Cookbook

Pandas 1.x Cookbook

4.5 (28)
By: Matthew 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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15
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16
Index

Calculating Boolean statistics

It can be informative to calculate basic summary statistics on Boolean arrays. Each value of a Boolean array, the True or False, evaluates to 1 or 0 respectively, so all the Series methods that work with numerical values also work with Booleans.

In this recipe, we create a Boolean array by applying a condition to a column of data and then calculate summary statistics from it.

How to do it…

  1. Read in the movie dataset, set the index to the movie title, and inspect the first few rows of the duration column:
    >>> import pandas as pd
    >>> import numpy as np
    >>> movie = pd.read_csv(
    ...     "data/movie.csv", index_col="movie_title"
    ... )
    >>> movie[["duration"]].head()
                                                Duration
    movie_title
    Avatar                                         178.0
    Pirates of the Caribbean: At World's End       169.0
    Spectre       ...

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