Python Boolean

Summary: in this tutorial, you’ll learn about the Python boolean data type, falsy and truthy values.

Introduction to Python Boolean data type

In programming, you often want to check if a condition is true or not and perform some actions based on the result.

To represent true and false, Python provides you with the boolean data type. The boolean value has a technical name as bool.

The boolean data type has two values: True and False.

Note that the boolean values True and False start with the capital letters (T) and (F).

The following example defines two boolean variables:

is_active = True is_admin = False
Code language: Python (python)

When you compare two numbers, Python returns the result as a boolean value. For example:

>>> 20 > 10 True >>> 20 < 10 False
Code language: Python (python)

Also, comparing two strings results in a boolean value:

>>> 'a' < 'b' True >>> 'a' > 'b' False
Code language: Python (python)

The bool() function

To find out if a value is True or False, you use the bool() function. For example:

>>> bool('Hi') True >>> bool('') False >>> bool(100) True >>> bool(0) False
Code language: Python (python)

As you can see clearly from the output, some values evaluate to True and the others evaluate to False.

Falsy and Truthy values

When a value evaluates to True, it’s truthy. And if a value evaluates to False, it’s falsy.

The following are falsy values in Python:

  • The number zero (0)
  • An empty string ''
  • False
  • None
  • An empty list []
  • An empty tuple ()
  • An empty dictionary {}

The truthy values are the other values that aren’t falsy.

Note that you’ll learn more about the None, list, tuple, and dictionary in the upcoming tutorials.


  • Python boolean data type has two values: True and False.
  • Use the bool() function to test if a value is True or False.
  • The falsy values evaluate to False while the truthy values evaluate to True.
  • Falsy values are the number zero, an empty string, False, None, an empty list, an empty tuple, and an empty dictionary. Truthy values are the values that are not falsy.
Did you find this tutorial helpful ?