code: def compile_timedelta(rule):
      
      if isinstance(rule.value, datetime.timedelta):
          return rule
      try:
          # Try numeric type
          return TimedeltaRule(datetime.timedelta(seconds = int(rule.value)))
      except:
          pass
      # Try RFC3339 timestamp string
      res = DURATION_RE.match(str(rule.value))
      if res is not None:
          days, hours, minutes, seconds = (int(n or 0) for n in res.group('days','hrs','mins','secs'))
          return TimedeltaRule(datetime.timedelta(days = days, hours = hours, minutes = minutes, seconds = seconds))
      raise ValueError("Wrong timedelta format '{}'".format(rule.value))
docs: Compiler helper method: attempt to compile constant into object representing
      timedelta object to enable math operations and relations with datetime objects
      using Python operators.