code: def parse_delta(__string: str) -> datetime.timedelta:
      
      if not __string:
          return datetime.timedelta(0)
      match = re.fullmatch(r"""
          P
          ((?P<days>\d+)D)?
          T?
          ((?P<hours>\d{1,2})H)?
          ((?P<minutes>\d{1,2})M)?
          ((?P<seconds>\d{1,2})?((?:\.(?P<microseconds>\d+))?S)?)
      """, __string, re.VERBOSE)
      if not match:
          raise ValueError('Unable to parse delta {!r}'.format(__string))
      match_dict = {k: int(v) if v else 0 for k, v in match.groupdict().items()}
      return datetime.timedelta(**match_dict)
docs: Parse ISO-8601 duration string.
  
      Args:
          __string: Duration string to parse
      Returns:
          Parsed delta object