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2.4 Built-in Constants

2.4 Built-in Constants

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

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

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

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.

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.

Special value used in conjunction with extended slicing syntax.

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