Book Image

Mastering pandas - Second Edition

By : Ashish Kumar
Book Image

Mastering pandas - Second Edition

By: Ashish Kumar

Overview of this book

pandas is a popular Python library used by data scientists and analysts worldwide to manipulate and analyze their data. This book presents useful data manipulation techniques in pandas to perform complex data analysis in various domains. An update to our highly successful previous edition with new features, examples, updated code, and more, this book is an in-depth guide to get the most out of pandas for data analysis. Designed for both intermediate users as well as seasoned practitioners, you will learn advanced data manipulation techniques, such as multi-indexing, modifying data structures, and sampling your data, which allow for powerful analysis and help you gain accurate insights from it. With the help of this book, you will apply pandas to different domains, such as Bayesian statistics, predictive analytics, and time series analysis using an example-based approach. And not just that; you will also learn how to prepare powerful, interactive business reports in pandas using the Jupyter notebook. By the end of this book, you will learn how to perform efficient data analysis using pandas on complex data, and become an expert data analyst or data scientist in the process.
Table of Contents (21 chapters)
Free Chapter
1
Section 1: Overview of Data Analysis and pandas
4
Section 2: Data Structures and I/O in pandas
7
Section 3: Mastering Different Data Operations in pandas
12
Section 4: Going a Step Beyond with pandas

Other methods for reshaping DataFrames

There are various other methods that are related to reshaping DataFrames; we'll discuss them here.

Using the melt function

The melt function enables us to transform a DataFrame by designating some of its columns as ID columns, ensuring they remain as columns with the remaining non-ID columns treated as variable columns and are pivoted and become part of a name-value two-column scheme. ID columns uniquely identify a row in a DataFrame.

The names of those non-ID columns can be customized by supplying the var_name and value_name parameters. The use of melt is perhaps best illustrated by an example, as follows:

    In [385]: from pandas.core.reshape import melt
    
    In [401]: USIndexDataDF...