\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}