split_fasta_byID.py

#!/usr/bin/env python

from Bio import SeqIO
import argparse

parser = argparse.ArgumentParser(description="Split the fasta file into individual file with each gene seq")
parser.add_argument('-i', action='store', dest='fasta_file', help='Input fasta file')
result = parser.parse_args()

f_open = open(result.fasta_file, "r")
for record in SeqIO.parse(f_open, "fasta"):
   id = record.id+".fasta"
   seq = record.seq
   id_file = open(id, "w")
   id_file.write(">"+str(record.id)+"\n"+str(seq))
   id_file.close()

f_open.close()