\section{Builtin Constants}

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

\begin{datadesc}{False}
The false value of the \code{bool} type.
\versionadded{2.3}
\end{datadesc}

\begin{datadesc}{True}
The true value of the \code{bool} type.
\versionadded{2.3}
\end{datadesc}

\begin{datadesc}{None}
The sole value of \code{NoneType}.  \code{None} is frequently used to
represent the absence of a value, as when default arguments are not passed
to a function.
\end{datadesc}

