Biopython parse fasta
from Bio import SeqIO
fasta_sequences = SeqIO.parse(open(input_file),'fasta')
with open(output_file) as out_file:
for fasta in fasta_sequences:
name, sequence = fasta.id, str(fasta.seq)
new_sequence = some_function(sequence)
write_fasta(out_file)
Trung Nguyen Vo Minh