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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