Greetings, this is Chad Adams, and welcome to Learning Python Data Visualization. In this book, we will cover the basics of generating dynamic charts and general graphics with code using the Python programming language. We will use the pygal library, a simple yet powerful graphing library written for Python, to explore the different types of charts we can create for various kinds of data.
We will also review the Python language itself and discuss working with file I/O and cover topics on working with data. We will then parse that data into a chart to create a dynamic charting application. We will also touch on more popular (and more advanced) libraries such as matplotlib and Plotly and build charts using these libraries and explore their features.
With this book, we will explore and build data visualizations using the basic toolsets used in many popular charting applications for the scientific, financial, medical, and pharmaceutical industries.
Chapter 1, Setting Up Your Development Environment, will discuss the installation process for Python on Windows, Mac, and Ubuntu. We will review the easy_install and pip package managers for Python and discuss common issues when installing third-party libraries for Python.
Chapter 2, Python Refresher, will quickly review the Python language and common libraries found in most Python developers' tool belts. We will also ease into building charts by creating custom graphics with nothing but code and learn about saving files to the filesystem.
Chapter 3, Getting Started with pygal, will cover the basics of the pygal library, a simple charting library that generates charts in HTML5-ready SVG files. We will build some basic charts using the library, some of which include line charts, bar charts, and scatter plots.
Chapter 4, Advanced Charts, will cover more complex charts in the pygal library such as box plots, radar charts, and worldmap charts.
Chapter 5, Tweaking pygal, will discuss the optional settings we can give our pygal charts such as adjusting the font size and the positioning of labels and legends. We will also cover the French country map chart in the pygal library using it as an example.
Chapter 6, Importing Dynamic Data, will go over the finer points of pulling data from the Web using the Python language and its built-in libraries and cover parsing XML, JSON, and JSONP data.
Chapter 7, Putting It All Together, will build a simple chart that takes what we learned from the past chapters and builds a dynamic pygal-based chart using data from the Web.
Chapter 8, Further Resources, will review some very popular charting libraries such as matplotlib and Plotly, go over building sample charts for each library, and cover resources for further reading.
Appendix, References and Resources, will list some popular data visualization libraries for Python as well as some helpful utilities.
You will need Windows, Mac, or an Ubuntu system that is running Python 2.7 32-bit or Python 2.7 64-bit. You will need to have administrator rights on this system. You will also need a Python text editor such as Eclipse or Visual Studio with Python Tools. For Chapter 8, Further Resources, you will also need Python 3.4 or higher. Python 2.7 and 3.4 can be installed alongside each other.
If you're new to the Python language and are looking at getting into building charts using Python, this is a great resource to get started. If you have done a bit of Python development already but have not ventured into graphics and charts, there is plenty of information in this book with regards to creating these.
In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Create a text file called PyREADME.txt and save it to your project's directory."
A block of code is set as follows:
def main():
print("Hello, World")
main()Any command-line input or output is written as follows:
sudo pip install pygal
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Click on OK on both windows to save and reboot your PC again."
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