What represents the absence of a value in Python?

• A. Null
• B. None
• C. undefined
• D. empty

Answer: (B)

In Python, the absence of a value is represented by the keyword None. This is a special constant that signifies "nothing" or "no value here." It is commonly used in functions to indicate that there is no return value or to denote that a variable has not been set to any specific value yet.

None is distinct in Python; while other languages may use terms like "Null" or "undefined," Python strictly uses None to represent the absence of a value. It can be compared to other objects in Python and is equivalent to no value being assigned but is not the same as an empty string or a zero number, which still hold their respective data types.

Using None effectively can help programmers manage state within their applications, allowing for clearer logic and control flow when determining whether or not a variable contains a meaningful value.