Make tab-delimited chromossome size file from fasta genome

getChrSizesFromFasta.py

import csv
from Bio import SeqIO

fastagenome = "data/oikopleura/assembly/Oikopleura_reference_unmasked_v3.0.fa"
output = "data/oikopleura/assembly/Oikopleura_reference_chrSizes.tsv"


myfile = open(output, "wb")
spamwriter = csv.writer(myfile, delimiter='\t', quoting=csv.QUOTE_MINIMAL)
for seq_record in SeqIO.parse(fastagenome, "fasta"):
    spamwriter.writerow([str(seq_record.id) , str(len(seq_record))])

myfile.close()