2007-08-15 11:28:22 -03:00
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Built-in Constants
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==================
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A small number of constants live in the built-in namespace. They are:
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2007-09-01 10:51:09 -03:00
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.. XXX False, True, None are keywords too
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2007-08-15 11:28:22 -03:00
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.. data:: False
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The false value of the :class:`bool` type.
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.. data:: True
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The true value of the :class:`bool` type.
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.. data:: None
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The sole value of :attr:`types.NoneType`. ``None`` is frequently used to
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represent the absence of a value, as when default arguments are not passed to a
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function.
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.. data:: NotImplemented
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Special value which can be returned by the "rich comparison" special methods
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(:meth:`__eq__`, :meth:`__lt__`, and friends), to indicate that the comparison
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is not implemented with respect to the other type.
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.. data:: Ellipsis
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The same as ``...``. Special value used mostly in conjunction with extended
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slicing syntax for user-defined container data types.
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.. % XXX Someone who understands extended slicing should fill in here.
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