\begin{Verbatim}[commandchars=\\\{\}]
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{k+kn}{from} \PYG{n+nn}{Bio.Seq} \PYG{k+kn}{import} \PYG{n}{Seq}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{my\PYGZus{}seq} \PYG{o}{=} \PYG{n}{Seq}\PYG{p}{(}\PYG{l+s+s2}{\PYGZdq{}GATCG\PYGZdq{}}\PYG{p}{)}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{k}{for} \PYG{n}{index}\PYG{p}{,} \PYG{n}{letter} \PYG{o+ow}{in} \PYG{n+nb}{enumerate}\PYG{p}{(}\PYG{n}{my\PYGZus{}seq}\PYG{p}{):}
\PYG{g+gp}{... }    \PYG{n+nb}{print}\PYG{p}{(}\PYG{l+s+s2}{\PYGZdq{}}\PYG{l+s+si}{\PYGZpc{}i}\PYG{l+s+s2}{ }\PYG{l+s+si}{\PYGZpc{}s}\PYG{l+s+s2}{\PYGZdq{}} \PYG{o}{\PYGZpc{}} \PYG{p}{(}\PYG{n}{index}\PYG{p}{,} \PYG{n}{letter}\PYG{p}{))}
\PYG{g+go}{0 G}
\PYG{g+go}{1 A}
\PYG{g+go}{2 T}
\PYG{g+go}{3 C}
\PYG{g+go}{4 G}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{print}\PYG{p}{(}\PYG{n+nb}{len}\PYG{p}{(}\PYG{n}{my\PYGZus{}seq}\PYG{p}{))}
\PYG{g+go}{5}
\end{Verbatim}
