To get the most out of this book

This book will attempt to bridge the gap between math, programming, and domain expertise. Most people today have expertise in at least one of these (maybe two), but proper data science requires a little bit of all three.

Download the example code files

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Principles-of-Data-Science-Second-Edition. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/9781789804546_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

dict = {"dog": "human's best friend", "cat": "destroyer of world"} 
dict["dog"]# == "human's best friend" 
len(dict["cat"]) # == 18 
 
# but if we try to create a pair with the same key as an existing key 
dict["dog"] = "Arf"

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

def jaccard(user1, user2): 
  stores_in_common = len(user1 & user2) 
  stores_all_together = len(user1 | user2) 
  return stores / float(stores_all_together) 

Any command-line input or output is written as follows:

import numpy as np

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.