Before you keep reading...

Runestone Academy can only continue if we get support from individuals like you. As a student you are well aware of the high cost of textbooks. Our mission is to provide great books to you for free, but we ask that you consider a $10 donation, more if you can or less if $10 is a burden.

Support Runestone Academy Today

Before you keep reading...

Making great stuff takes time and $$. If you appreciate the book you are reading now and want to keep quality materials free for other students please consider a donation to Runestone Academy. We ask that you consider a $10 donation, but if you can give more thats great, if $10 is too much for your budget we would be happy with whatever you can afford as a show of support.

Support Runestone Academy Today

15.5. Chapter 15 - Concept Summary

Chapter 15 included the following concepts from computing.

• Condition - A condition is something that is either true or false. This is also called a Boolean expression or a logical expression.

• Conditional Execution - Conditional execution means that one or more statements are executed only when a condition (logical expression) is true. This is also called a conditional. The statements that are executed when the condition is true are called the body of the loop.

• Decision - A decision is a choice between at least two choices.

• Edge Detection - Edge detection is a image processing technique. It finds the “edges” in an image which are the areas of high constrast or where the color changes.

• Posterize - Posterize means to reduce the number of colors in an image so that it looks like a poster.

15.5.1. Summary of Python Keywords and Functions

• And - The keyword and is used to join two logical expressions and then both of the logical expressions must be true for the joined expression to be true.

• Else - The keyword else is used to execute one or more statements in a block following the else when the condition in the if part of the statement is false. An else must always have an if statement before it.

• Elif - The keyword elif is used when you want to have a conditional with 3 or more possibile options. Add as many elif statements as you need after an if and before a else.

• If - The Python keyword if is used to start a condition. It is followed by a Boolean expression and then has one or more statements in the body of the loop that are executed only if the Boolean expression is true.

• Not - The keyword not is used to negate a logical expression. If the original expression is true the negated expression is false and if the original expression is false the negated expression is true.

Note

This is the end of chapter 15. We would love it if you could give us some feedback on this chapter at https://www.surveymonkey.com/r/ch15-student-fb. You might want to open this link in a new tab to make it easier for you to return to your place in this ebook.

You have attempted of activities on this page