# 18.2: Boolean Expressions

- Page ID
- 15377

A **boolean expression** is an expression that is either true or false. The following examples use the operator `==`

, which compares two operands and produces `True`

if they are equal and `False`

otherwise:

>>> 5 == 5 True >>> 5 == 6 False

`True`

and `False`

are special values that belong to the type `bool`

; they are not strings:

>>> type(True) <type 'bool'> >>> type(False) <type 'bool'>

The `==`

operator is one of the **relational operators**; the others are:

x != y # x is not equal to y x > y # x is greater than y x < y # x is less than y x >= y # x is greater than or equal to y x <= y # x is less than or equal to y

Although these operations are probably familiar to you, the Python symbols are different from the mathematical symbols. A common error is to use a single equal sign (`=`

) instead of a double equal sign (`==`

). Remember that `=`

is an assignment operator and `==`

is a relational operator. There is no such thing as `=<`

or `=>`

.