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: SRTM.py on GitHub is an example.

A block of code is set as follows:

IF SUM([Amount of Precipitation (inches)]) >= 0.2 THEN
 "Yes"
ELSE
 "No"
END

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

hdfs dfs -put lots_o_data.csv /user/hadoop/datafolder/lots_o_data.csv

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: "In the Parameters section on the same page."