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, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "This is the reason we included the on_touch_down event."

A block of code is set as follows:

1. # File name: hello.py
2. import kivy
3. kivy.require('1.9.0')
4. 
5. from kivy.app import App
6. from kivy.uix.button import Label
7. 
8. class HelloApp(App):
9.     def build(self):
10         return Label(text='Hello World!')
11. 
12. if __name__=="__main__":
13.         HelloApp().run()

The numeration restarts at the beginning of each chapter providing a unique identifier to each line code. Code from previous chapter will never be referenced, instead it will be copied again if needed. When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold, for example, line 10.

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: "We need an alternate way to stop the video (different from the Stop button)."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.