How To Use Python bool() Function To Convert Variable To Boolean Examples

The bool() function in Python is used to convert a value to a Boolean (True or False) value. In this article, I will show you some examples on how to use the bool() function.

1. Python bool() Function Examples.

1.1 Example 1.

1. Using bool() with integers.

   >>> print(bool(0))
   False
   >>> print(bool(1))
   True
   >>> print(bool(-1))
   True
   >>>
   >>> print(bool(10))
   True
   >>> print(bool(-10))
   True

2. In this example, bool() is used to convert integers to Boolean values. Any non-zero integer will be converted to True, while zero will be converted to False.

1.2 Example 2.

1. Using bool() with strings.

   >>> print(bool(""))
   False
   >>> print(bool(" "))
   True
   >>> print(bool("hello"))
   True

2. In this example, bool() is used to convert strings to Boolean values. An empty string will be converted to False, while any non-empty string will be converted to True.

1.3 Example 3.

1. Using bool() with lists.

   >>> print(bool([]))
   False
   >>>
   >>> print(bool([1,2,3]))
   True

2. In this example, bool() is used to convert lists to Boolean values. An empty list will be converted to False, while any non-empty list will be converted to True.

1.4 Example 4.

1. Using bool() with None.

   >>> print(bool(None))
   False

2. In this example, bool() is used to convert None to a Boolean value. None will be converted to False.

1.5 Example 5.

1. Using bool() with functions.

   >>> def foo():
   ...     return 1
   ...
   >>> def bar():
   ...     return None
   ...
   >>> print(bool(foo()))
   True
   >>> print(bool(bar()))
   False

2. In this example, bool() is used to convert functions to Boolean values.
3. Any function will be converted to True, regardless of its return value.
4. Note: In Python, several values are considered “falsey” and will be converted to False by bool().
5. These include False, 0, None, empty sequences (e.g., "", [], ()), and empty mappings (e.g., {}).
6. All other values are considered “truthy” and will be converted to True.