\begin{Verbatim}[commandchars=\\\{\}]
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{k+kn}{from} \PYG{n+nn}{Bio} \PYG{k+kn}{import} \PYG{n}{SeqIO}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{fq\PYGZus{}dict} \PYG{o}{=} \PYG{n}{SeqIO}\PYG{o}{.}\PYG{n}{index}\PYG{p}{(}\PYG{l+s+s2}{\PYGZdq{}SRR020192.fastq\PYGZdq{}}\PYG{p}{,} \PYG{l+s+s2}{\PYGZdq{}fastq\PYGZdq{}}\PYG{p}{)}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{len}\PYG{p}{(}\PYG{n}{fq\PYGZus{}dict}\PYG{p}{)}
\PYG{g+go}{41892}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n+nb}{list}\PYG{p}{(}\PYG{n}{fq\PYGZus{}dict}\PYG{o}{.}\PYG{n}{keys}\PYG{p}{())[:}\PYG{l+m+mi}{4}\PYG{p}{]}
\PYG{g+go}{[\PYGZsq{}SRR020192.38240\PYGZsq{}, \PYGZsq{}SRR020192.23181\PYGZsq{}, \PYGZsq{}SRR020192.40568\PYGZsq{}, \PYGZsq{}SRR020192.23186\PYGZsq{}]}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{fq\PYGZus{}dict}\PYG{p}{[}\PYG{l+s+s2}{\PYGZdq{}SRR020192.23186\PYGZdq{}}\PYG{p}{]}\PYG{o}{.}\PYG{n}{seq}
\PYG{g+go}{Seq(\PYGZsq{}GTCCCAGTATTCGGATTTGTCTGCCAAAACAATGAAATTGACACAGTTTACAAC...CCG\PYGZsq{})}
\end{Verbatim}
