code: def load_from_args(args):
      
      if not args.reads:
          return None
  
      if args.read_source_name:
          read_source_names = util.expand(
              args.read_source_name,
              'read_source_name',
              'read source',
              len(args.reads))
      else:
          read_source_names = util.drop_prefix(args.reads)
  
      filters = []
      for (name, info) in READ_FILTERS.items():
          value = getattr(args, name)
          if value is not None:
              filters.append(functools.partial(info[-1], value))
  
      return [
          load_bam(filename, name, filters)
          for (filename, name)
          in zip(args.reads, read_source_names)
      ]
docs: Given parsed commandline arguments, returns a list of ReadSource objects