11.8. Chapter Summary

This chapter included the following concepts from computing.

• Boolean Expression - A Boolean expression is one that is either true or false. This is also called a logical expression.

• 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.

• Flowchart - A flowchart is a diagram that shows the execution paths for a program. The conditionals are shown as diamonds.

• Logical Expression - A logical expression is one that is either true or false, like x == 3 which will return true if x is equal to 3. This is also called a Boolean expression.

11.8.1. Summary of Python Keywords and Functions

• 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.

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