Boolean Expressions

Table of contents

1. Description
2. Example
3. Comparison Operators
4. Boolean Operators
5. Boolean Functions and Methods

Description

A boolean expression is any logical statement that evaluates to either True or False. They can be a comparison, an identity or membership test, or methods that return a boolean value.

• Python Docs: Truth Value Testing

Example

Comparison Operators

<, <=, >, >=, ==, and != are comparison operators. They compare 2 values and return a True or False. They can also be “chained” together:

name > "a"
17 < age < 26

Boolean Operators

and, or, and not are boolean operators. They are used to change or combine the results of a boolean expression:

age < 18 or age > 65
age > 17 and age < 26

Boolean Functions and Methods

Methods and functions applied to variables can sometimes return a True or False:

name.islower()
name.isalpha()