\begin{Verbatim}[commandchars=\\\{\}]
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{p} \PYG{o}{=} \PYG{n}{PDBParser}\PYG{p}{()}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{structure} \PYG{o}{=} \PYG{n}{p}\PYG{o}{.}\PYG{n}{get\PYGZus{}structure}\PYG{p}{(}\PYG{l+s+s2}{\PYGZdq{}X\PYGZdq{}}\PYG{p}{,} \PYG{l+s+s2}{\PYGZdq{}pdb1fat.ent\PYGZdq{}}\PYG{p}{)}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{k}{for} \PYG{n}{model} \PYG{o+ow}{in} \PYG{n}{structure}\PYG{p}{:}
\PYG{g+gp}{... }    \PYG{k}{for} \PYG{n}{chain} \PYG{o+ow}{in} \PYG{n}{model}\PYG{p}{:}
\PYG{g+gp}{... }        \PYG{k}{for} \PYG{n}{residue} \PYG{o+ow}{in} \PYG{n}{chain}\PYG{p}{:}
\PYG{g+gp}{... }            \PYG{k}{for} \PYG{n}{atom} \PYG{o+ow}{in} \PYG{n}{residue}\PYG{p}{:}
\PYG{g+gp}{... }                \PYG{n+nb}{print}\PYG{p}{(}\PYG{n}{atom}\PYG{p}{)}
\PYG{g+gp}{...}
\end{Verbatim}
