None

Python has a special null value called None, spelled with a capital N. None is frequently used to represent the absence of a value. The Python REPL never prints None results, so typing None into the REPL has no effect:

>>> None
>>>

The null value None can be bound to variable names just like any other object:

>>> a = None

and we can test whether an object is None by using Python's is operator:

>>> a is None
True

We can see here that the response is True, which brings us conveniently on to the bool type.