Update 2.1.2_host_prediction_II.md

_episodes/2.1.2_host_prediction_II.md

@@ -73,16 +73,21 @@ forest model. This model matches the set of proteins with host proteins it was t
 > from Bio import SeqIO
 > 
 > def main():
-> 
+>
+>     # define file paths from the arguments
 >     assembly_path = os.path.abspath(sys.argv[1])
 >     assert assembly_path.endswith(".fasta")
->     
+>
+>     # set an output directory and create it if it does not exist
 >     out_dir = os.path.abspath(sys.argv[2])
 >     if not os.path.exists(out_dir): os.makedirs(out_dir)
-> 
+>
+>     # loop through the records in the combined assembly
 >     with open(assembly_path) as handle:
 >         for record in SeqIO.parse(handle, "fasta"):
+>             # set a filename per record
 >             out_fasta = os.path.join(out_dir, f"{record.id}.fasta")
+>             # write the record to the file
 >             with open(out_fasta, "w") as fout:
 >                 SeqIO.write([record], fout, "fasta")
 >