Book Image

Big Data Analysis with Python

By : Ivan Marin, Ankit Shukla, Sarang VK
Book Image

Big Data Analysis with Python

By: Ivan Marin, Ankit Shukla, Sarang VK

Overview of this book

Processing big data in real time is challenging due to scalability, information inconsistency, and fault tolerance. Big Data Analysis with Python teaches you how to use tools that can control this data avalanche for you. With this book, you'll learn practical techniques to aggregate data into useful dimensions for posterior analysis, extract statistical measurements, and transform datasets into features for other systems. The book begins with an introduction to data manipulation in Python using pandas. You'll then get familiar with statistical analysis and plotting techniques. With multiple hands-on activities in store, you'll be able to analyze data that is distributed on several computers by using Dask. As you progress, you'll study how to aggregate data for plots when the entire data cannot be accommodated in memory. You'll also explore Hadoop (HDFS and YARN), which will help you tackle larger datasets. The book also covers Spark and explains how it interacts with other tools. By the end of this book, you'll be able to bootstrap your own Python environment, process large files, and manipulate data to generate statistics, metrics, and graphs.
Table of Contents (11 chapters)
Big Data Analysis with Python
Preface

Exporting Graphs


After generating our visualizations and configuring the details, we can export our graphs to a hard copy format, such as PNG, JPEG, or SVG. If we are using the interactive API in the notebook, we can just call the savefig function over the pyplot interface, and the last generated graph will be exported to the file:

df.plot(kind='scatter', x='weight', y='horsepower', figsize=(20,10))
plt.savefig('horsepower_weight_scatter.png')

Figure 2.26: Exporting the graphs

All plot configurations will be carried to the plot. To export a graph when using the object-oriented API, we can call savefig from the figure:

fig, ax = plt.subplots()
df.plot(kind='scatter', x='weight', y='horsepower', figsize=(20,10), ax=ax)
fig.savefig('horsepower_weight_scatter.jpg')

Figure 2.27: Saving the graph

We can change some parameters for the saved image:

  • dpi: Adjust the saved image resolution.

  • facecolor: The face color of the figure.

  • edgecolor: The edge color of the figure, around the graph.

  • format: Usually PNG...