code: def _parse_field_list(fieldnames, include_parents=False):
      
      field_parts = (name.split('.') for name in fieldnames)
      return _collect_fields(field_parts, include_parents)
docs: Parse a list of field names, possibly including dot-separated subform
      fields, into an internal ParsedFieldList object representing the base
      fields and subform listed.
  
      :param fieldnames: a list of field names as strings. dot-separated names
          are interpreted as subform fields.
      :param include_parents: optional boolean, defaults to False. if True,
          subform fields implicitly include their parent fields in the parsed
          list.