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: “For example, if you want to install the abc_def package on ROS Jazzy, then you will need to run sudo apt install ros-jazzy-abc-def.”

A block of code is set as follows:

#!/usr/bin/env python3
import rclpy
from rclpy.node import Node

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

entry_points={
    'console_scripts': [
        "test_node = my_py_pkg.my_first_node:main"
    ],
},

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

$ sudo apt update
$ sudo apt upgrade

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “To start the VM, double click on it in VirtualBox Manager, or select it and click on the Start button.”

Tips or important notes

Appear like this.