.. _built-in-consts:

Built-in Constants
==================

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

.. data:: False

  :term:`Pyccel alpha`,


.. data:: True

  :term:`Pyccel alpha`,


.. data:: None

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


.. data:: NotImplemented

  :term:`Pyccel restriction`,


.. data:: Ellipsis

  :term:`Pyccel restriction`,


.. data:: __debug__

  :term:`Pyccel alpha`,