Python bool() Builtin Function

Python bool() builtin function takes an object as argument and returns True if the object evaluates to true, or False otherwise.

In this tutorial, we will learn how to create a boolean value using bool() builtin function.

Syntax

The syntax to create a boolean value from Python object is

result = bool(obj)

where obj is any Python object and result is a boolean value.

bool() function by default, with no argument passed, returns False.

Example

In the following program, we will take take an integer value in variable obj and find its boolean value using bool() builtin function.

Python Program

obj = 87
result = bool(obj)
print(f'bool({obj}) returns {result}')
Try Online

Output

bool(87) returns True

In the following program, we will take take an integer value of zero in variable obj and find its boolean value using bool() builtin function.

Python Program

obj = 0
result = bool(obj)
print(f'bool({obj}) returns {result}')
Try Online

Output

bool(0) returns False

In the following program, we will take a non-empty list and find its boolean value.

Python Program

obj = [14, 52, 3]
result = bool(obj)
print(f'bool({obj}) returns {result}')
Try Online

Output

bool([14, 52, 3]) returns True

In the following program, we will take an empty list and find its boolean value.

Python Program

obj = []
result = bool(obj)
print(f'bool({obj}) returns {result}')
Try Online

Output

bool([]) returns False

Conclusion

In this Python Tutorial, we learned about bool() builtin function in Python, with the help of example programs.