\begin{Verbatim}[commandchars=\\\{\}]
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{k+kn}{import} \PYG{n+nn}{numpy}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{observed\PYGZus{}frequencies} \PYG{o}{/=} \PYG{n}{numpy}\PYG{o}{.}\PYG{n}{sum}\PYG{p}{(}\PYG{n}{observed\PYGZus{}frequencies}\PYG{p}{)}
\end{Verbatim}
