Boolean and none

The integers 0 and 1 can also represent Boolean values in Python. These values are the Boolean False or True objects, respectively. To define a Boolean, we can use the bool() constructor statement. These data types are used extensively in program logic to evaluate statements for conditionals, as covered later in this chapter.

Another built-in data type is the null type, which is defined by the keyword None. When used, it represents an empty object, and when evaluated will return False. This is helpful when initializing a variable that may use several data types throughout execution. By assigning a null value, the variable remains sanitized until reassigned:

>>> bool(0)
False
>>> bool(1)
True
>>> None
>>>