code: def read_header(headerlabels, options):
      
  
      # set input variables
      status_field = options.status_field
  
      # confirm that status_field exists
      status_field_matcher = re.compile(status_field)
      if not any(x for x in headerlabels if status_field_matcher.match(x)):
          print("\n The status_field column '{s}' doesn't exist\n".format(s=status_field))
          sys.exit(1)
  
      # initiate prop_column dictionary and csv column index
      prop_indices = {}
      index = 0
  
      for label in headerlabels:
          prop_indices[label] = index
          index += 1
  
      return prop_indices
docs: read csv header, returns prop_indices dictionary, {'label' : index}
  	where label is the csv column label, and index the column index