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2.5 Built-in Constants

A small number of constants live in the built-in namespace. They are:

False

The false value of the bool type. New in version 2.3.

True

The true value of the bool type. New in version 2.3.

None

The sole value of types.NoneType. None is frequently used to represent the absence of a value, as when default arguments are not passed to a function.

NotImplemented

Special value which can be returned by the ``rich comparison'' special methods (__eq__(), __lt__(), and friends), to indicate that the comparison is not implemented with respect to the other type.

Ellipsis

Special value used in conjunction with extended slicing syntax.

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