Introduction
In Python, None is a special constant that represents the absence of a value or a null value. It is an object of its own data type, the NoneType, and it is not equivalent to any other value or data type.
The NoneType
The type of None is NoneType, which is a built-in type in Python.
NoneType has only a single value, None. This makes None a unique and singular entity in Python, and it is always the same object in memory.
Example:
print(type(None))
Output:
<class 'NoneType'>
Assigning None
You can assign None to a variable to indicate that it is empty or has no value.
Example:
my_variable = None print(my_variable)
Output:
None
Checking for None
You can check if a variable is None using the is operator, which checks for identity (i.e., if two references point to the same object).
Example:
my_variable = None print(my_variable is None)
Output:
True
Summary & Reference for the Python None Value
None is a special constant in Python that signifies the absence of a value.
The type of None is NoneType. It is a built-in type in Python with None as its only value.
print(type(None)) # --> <class 'NoneType'>
You can assign None to a variable to indicate that it is empty or has no value.
my_variable = None print(my_variable) # --> None
To check whether a variable is None, use the is keyword.
my_variable = None print(my_variable is None) # --> True