I use a variety of conventions in this book to help with the learning process, as outlined below.

In a browser on a computer screen, each page has a context-sensitive menu on the right side of the screen. You can find this menu on mobile devices under the menu symbol at the top of the screen. Next/Previous Navigation ...At the bottom of each page, there are previous and next page buttons you can use to return to previous content or move on to the next page of content in sequence.

Throughout the book, I provide many Python code examples that you can study, and copy and paste into your Python editor to explore and use for practice. Code segments are in the Courier font and appear on a background color as shown below. Also, note that the code block includes line numbers along the left edge and I use these in the surrounding narrative and Code Details to aid in your learning.

Code

for n in range(10, 50, 10):
    print(n)

Output

10
20
30
40

Code & Output Details

• Code Line 1: Notes about Code Line 1.
• Code Line 2: Notes about Code Line 2.
• Code Line ...: Notes about Code Line ...
• Code Line n: Notes about Code Line n.
• Output Line 1: Notes about Output Line 1.
• Output Line 2: Notes about Output Line 2.
• Output Line ...: Notes about Output Line ...
• Output Line n: Notes about Output Line n.

Throughout the book, I ask questions and provide examples that lead to a result. In many cases, I hide the answer so you can try to answer the question or determine the outcome on your own before I give you the answer. In those cases, you'll see the question or example followed by an Answer button that will display the answer or result when you click on it. For example: