{"id":2011,"date":"2020-12-29T07:32:40","date_gmt":"2020-12-29T07:32:40","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=2011"},"modified":"2025-03-27T15:14:59","modified_gmt":"2025-03-27T15:14:59","slug":"python-bool","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/advanced-python\/python-bool\/","title":{"rendered":"Python bool"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll have a deep understanding of the Python bool<\/code> class and how to handle boolean values effectively.<\/p>\n\n\n\n

Introduction to the Python bool class #<\/a><\/h2>\n\n\n\n

To represent boolean<\/a> values including True<\/code> and False<\/code>, Python uses the built-in bool<\/code> class.<\/p>\n\n\n\n

The bool<\/code> class is the subclass<\/a> of the int<\/a><\/code> class. It means that the bool<\/code> class inherits<\/a> all properties and methods of the int<\/code> class. In addition, the bool<\/code> class has specific behaviors related to boolean operations.<\/p>\n\n\n\n

If you use the issubclass()<\/code> function for the bool<\/code> and int<\/code> classes, it’ll return True<\/code> as follows:<\/p>\n\n\n

is_child_class = issubclass(bool, int)\nprint(is_child_class)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
True<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
In fact, True<\/code> and False<\/code> are singleton<\/strong> objects of the bool<\/code> class.<\/p>\n\n\n
isinstance(True<\/span>, bool)\nisinstance(False<\/span>, bool)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n\n
The following uses the isinstance()<\/code> function to check if True<\/code> and False<\/code> are the instances of bool<\/code> class:<\/p>\n\n\n
True<\/span>\nTrue<\/span>   <\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Since both True<\/code> and False<\/code> are also int<\/code> objects, you can convert them to integers:<\/p>\n\n\n
true_value = int(True<\/span>)\nprint(true_value)\n\nfalse_value = int(False<\/span>)\nprint(false_value)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
1<\/span>\n0<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Python interprets True<\/code> as 1 and False<\/code> as 0.<\/p>\n\n\n\n
Please note that True<\/code> and 1 are not the same object. Likewise, False<\/code> and 0 are not the same.<\/p>\n\n\n\n
Comparing boolean values #<\/a><\/h2>\n\n\n\n
Since True<\/code> and False<\/code> are singleton objects that always reference<\/a> the same objects in the memory throughout the program.<\/p>\n\n\n\n
Therefore, you can use either is<\/code> or ==<\/code> operator to compare boolean values. The results are the same. For example:<\/p>\n\n\n
a = True<\/span>\nb = True<\/span>\n\nprint(a == b)\nprint(a is<\/span> b)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
True<\/span>\nTrue<\/span>   <\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
The same is applied to the False<\/code> object:<\/p>\n\n\n
a = False<\/span>\nb = False<\/span>\n\nprint(a == b)\nprint(a is<\/span> b)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
True<\/span>\nTrue<\/span>   <\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
How Python bool() constructor works under the hood #<\/a><\/h2>\n\n\n\n
The Boolean constructor bool()<\/code> accepts an object and returns True<\/code> or False<\/code>.<\/p>\n\n\n\n
In Python, a class always contains a definition of how its instances evaluate to True<\/code> and False<\/code>. In other words, every object can be either True<\/code> or False<\/code>.<\/p>\n\n\n\n
All objects have a boolean value of True<\/code>, except the following objects:<\/p>\n\n\n\n
Try it<\/a><\/p>\n\n\n\n
Try it<\/a><\/p>\n\n\n\n