Book Image

Python Data Visualization Cookbook (Second Edition)

Book Image

Python Data Visualization Cookbook (Second Edition)

Overview of this book

Python Data Visualization Cookbook will progress the reader from the point of installing and setting up a Python environment for data manipulation and visualization all the way to 3D animations using Python libraries. Readers will benefit from over 60 precise and reproducible recipes that will guide the reader towards a better understanding of data concepts and the building blocks for subsequent and sometimes more advanced concepts. Python Data Visualization Cookbook starts by showing how to set up matplotlib and the related libraries that are required for most parts of the book, before moving on to discuss some of the lesser-used diagrams and charts such as Gantt Charts or Sankey diagrams. Initially it uses simple plots and charts to more advanced ones, to make it easy to understand for readers. As the readers will go through the book, they will get to know about the 3D diagrams and animations. Maps are irreplaceable for displaying geo-spatial data, so this book will also show how to build them. In the last chapter, it includes explanation on how to incorporate matplotlib into different environments, such as a writing system, LaTeX, or how to create Gantt charts using Python.
Table of Contents (16 chapters)
Python Data Visualization Cookbook Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Filling an under-plot area


The basic way to draw a filled polygon in matplotlib is to use matplotlib.pyplot.fill. This function accepts similar arguments as matplotlib.pyplot.plot—multiple x and y pairs and other Line2D properties. This function returns the list of patch instances that were added.

In this recipe, you will learn how to shade certain areas of plot intersections.

Getting ready

matplotlib provides several functions to help us plot filled figures, apart from plotting functions that are inherently plotting closed filled polygons, such as histogram (), of course.

We already mentioned one—matplotlib.pyplot.fill—but there are the matplotlib.pyplot.fill_between() and matplotlib.pyplot.fill_betweenx() functions too. These functions fill the polygons between two curves. The main difference between fill_between() and fill_betweenx() is that the latter fills between the x axis values, whereas the former fills between the y axis values.

The fill_between function accepts argument x—an x axis...