Conventions

In this book, you will find a number of text styles 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, path names, dummy URLs, user input, and Twitter handles are shown as follows: "Now, you'll need to remember the path that we installed the JDK into, which in our case was C:\jdk." A block of code is set as follows:

from pyspark import SparkConf, SparkContext 
import collections 

conf = SparkConf().setMaster("local").setAppName("RatingsHistogram") 
sc = SparkContext(conf = conf) 

lines = sc.textFile("file:///SparkCourse/ml-100k/u.data") 
ratings = lines.map(lambda x: x.split()[2]) 
result = ratings.countByValue() 

sortedResults = collections.OrderedDict(sorted(result.items())) 
for key, value in sortedResults.items(): 
    print("%s %i" % (key, value)) 

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

from pyspark import SparkConf, SparkContext 
import collections 

conf = SparkConf().setMaster("local").setAppName("RatingsHistogram") 
sc = SparkContext(conf = conf) 

lines = sc.textFile("file:///SparkCourse/ml-100k/u.data") 
ratings = lines.map(lambda x: x.split()[2]) 
result = ratings.countByValue() 

sortedResults = collections.OrderedDict(sorted(result.items())) 
for key, value in sortedResults.items(): 
    print("%s %i" % (key, value))

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

spark-submit ratings-counter.py

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Now, if you're on Windows, I want you to right-click on the Enthought Canopy icon, go to Properties and then to Compatibility (this is on Windows 10), and make sure Run this program as an administrator is checked"