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None

How to check against None:

variable = None

if variable is None:
    print("variable is None")
else:
    print("variable is not None")

GPT on null and None

GPT on null and None

In Python, None is the equivalent of what's often referred to as null in many other programming languages. Python does not have a separate null keyword or object; it only has None.

None is a special constant in Python that represents the absence of a value or a null value. It's an object of its own datatype (NoneType) and is a singleton, which means there is only one instance of None in a Python program.

Here are a few key points about None in Python:

  1. None is often used as a default value for function arguments, to represent an empty value, or when there's nothing to return from a function.

  2. None is not the same as False, 0, or an empty string. None is a datatype of its own (NoneType) and only None is equal to None.

  3. To check if a variable is None, use the is operator (e.g., if variable is None:).

So, in Python, when you see a reference to null, it's almost always about None.