bool() Builtin Function

Python - bool()

Python bool() builtin function is used to get the boolean value of a given object.

In this tutorial, you will learn the syntax of bool() function, and then its usage with the help of example programs.

Syntax

The syntax of bool() function is

bool(x)

where

ParameterDescription
xAn object.

bool() returns a boolean value of False for the following values of x.

  • Empty objects like [], (), {}, ''.
  • 0
  • None
  • False

For any other values of the argument, the bool() function returns True.

Examples

1. Boolean of a non-zero value

In the following program, we take an integer (non-zero) value in x and find its boolean value using bool() function.

Python Program

x = 7
output = bool(x)
print(f'x       : {x}')
print(f'bool(x) : {output}')

Output

x       : 7
bool(x) : True

2. Boolean of an empty string

In the following program, we take an empty string value in x and find its boolean value using bool() function.

Python Program

x = ""
output = bool(x)
print(f'x       : {x}')
print(f'bool(x) : {output}')

Output

x       : 
bool(x) : False

Summary

In this tutorial of Python Examples, we learned the syntax of bool() function, and how to find the boolean value of a given object using bool() with examples.