old_contents: #!/usr/bin/env python
  import sys
  from Bio import SeqIO
  from Bio.SeqRecord import SeqRecord
  
  if len(sys.argv) < 5: 
      print("Usage: %s <length threshold> <contigs_file> <suffix> <output>" % sys.argv[0])
      sys.exit(1) 
  
  f_n = sys.argv[2]
  suffix = sys.argv[3]
  input_seq_iterator = SeqIO.parse(open(f_n, "r"), "fasta")
  
  output_handle = open(sys.argv[4], "w")
  SeqIO.write((SeqRecord(record.seq, (record.name + "_" + suffix).replace(".", "_"), "","") for record in input_seq_iterator \
                  if len(record.seq) > int(sys.argv[1])), output_handle, "fasta")
  output_handle.close()
  
new_contents: #!/usr/bin/env python
  import sys
  from Bio import SeqIO
  
  if len(sys.argv) < 4: 
      print("Usage: %s <length threshold> <contigs_file> <output>" % sys.argv[0])
      sys.exit(1) 
  
  f_n = sys.argv[2]
  input_seq_iterator = SeqIO.parse(open(f_n, "r"), "fasta")
  filtered_iterator = (record for record in input_seq_iterator \
                        if len(record.seq) > int(sys.argv[1]))
   
  output_handle = open(sys.argv[3], "w")
  SeqIO.write(filtered_iterator, output_handle, "fasta")
  output_handle.close()
  
subject: Revert "length filter script now adds provided suffix to contig names"