code: def load_from_args(args):
      
      if not args.locus:
          return None
  
      loci_iterator = (Locus.parse(locus) for locus in args.locus)
  
  #   if args.neighbor_offsets:
  #       loci_iterator = expand_with_neighbors(
  #           loci_iterator, args.neighbor_offsets)
  
      return Loci(loci_iterator)
docs: Return a Loci object giving the loci specified on the command line.
  
      If no loci-related arguments are specified, return None. This makes it
      possible to distinguish an empty set of loci, for example due to filters
      removing all loci, from the case where the user didn't specify any
      arguments.