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)
15
Other Books You May Enjoy
16
Index

Replicating nlargest with sort_values

The previous two recipes work similarly by sorting values in slightly different manners. Finding the top n values of a column of data is equivalent to sorting the entire column in descending order and taking the first n values. pandas has many operations that are capable of doing this in a variety of ways.

In this recipe, we will replicate the Selecting the smallest of the largest recipe with the .sort_values method and explore the differences between the two.

How to do it…

  1. Let's recreate the result from the final step of the Selecting the smallest of the largest recipe:
    >>> movie = pd.read_csv("data/movie.csv")
    >>> (
    ...     movie[["movie_title", "imdb_score", "budget"]]
    ...     .nlargest(100, "imdb_score")
    ...     .nsmallest(5, "budget")
    ... )
                   movie_title  imdb_score    budget
    4804        Butterfly Girl   ...