Conventions used

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

Code in text: 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:

s1 = set([1,2,3,4,5,6])
print(s1)
s2 = {1,2,2,3,4,4,5,6,6}
print(s2)
s3 = {3,4,5,6,6,6,1,1,2}
print(s3)

The output of a code block is highlighted in bold:

{1, 2, 3, 4, 5, 6}

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

[default]
import math
def factorial_sum(numbers):
    total = 0
    for n in numbers:
        total += math.factorial(n)
    return total

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

$ mkdir css
$ cd css

Bold: Indicates a new term, an important word, or words that you see on screen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Select System info from the Administration panel.”

Tips or Important Notes

Appear like this.