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Python bool() Function: Use, Syntax, and Examples

Python bool() function: In this tutorial, we will learn about the bool() function in Python with its use, syntax, parameters, returns type, and examples. By IncludeHelp Last updated : June 23, 2023

Python bool() function

The bool() function is a library function in Python, it is used to convert a given value to the Boolean value (True or False) as per the standard truth testing procedures. It accepts a value (like an integer, list, map, etc) and converts it into a Boolean value.

Some of the examples:

• None – converts to False
• False – converts to False
• Zeros (0, 0.0, 0j) – converts to False
• Empty sequences like, (), [], ' ' – converts to False

Syntax

The following is the syntax of bool() function:

bool([value])

Parameter(s):

The following are the parameter(s):

• value – A value to be converted to the Boolean value, it's an optional parameter, if we do not pass any parameter – it returns False.

Return Value

The return type of bool() function is <class 'bool'>, it returns a Boolean value either True or False.

Python bool() Function: Example 1

# python code to demonstrate example
# of bool() function

x = 10
y = True
z = False

print(bool(x))
print(bool(y))
print(bool(z))

Output

True
True
False

Python bool() Function: Example 2

# python code to demonstrate example
# of bool() function

val = False
print("val = ", bool(val))

val = True
print("val = ", bool(val))

val = 10
print("val = ", bool(val))

val = 0
print("val = ", bool(val))

val = 10.23
print("val = ", bool(val))

val = 0.0
print("val = ", bool(val))

val = "Hello"
print("val = ", bool(val))

val = []
print("val = ", bool(val))

Output

val =  False
val =  True
val =  True
val =  False
val =  True
val =  False
val =  True
val =  False