gbk_cds.py

from Bio import SeqIO
for seq_record in SeqIO.parse("NC_000913.gbk", "genbank"):
    for feature in seq_record.features:
        if feature.qualifiers.has_key('locus_tag'):
            start = feature.location.nofuzzy_start
            end = feature.location.nofuzzy_end
            print ">" + feature.qualifiers['locus_tag'][0]
            print seq_record.seq[start:end]