Split a multi entry fasta file into several files with on entry

split_fasta.py

import argparse
from Bio import SeqIO

parser = argparse.ArgumentParser(
    description="Split a multi entry fasta file into several files "
    "with one entry")
parser.add_argument("input_file")
parser.add_argument("output_prefix")
args = parser.parse_args()

for seq_record in SeqIO.parse(args.input_file, "fasta"):
    with open(args.output_prefix + seq_record.id + ".fa", "w") as output_fh:
        output_fh.write(">{}\n{}\n".format(
            seq_record.id, str(seq_record.seq)))