code: def _parse_interval(value):
      '''
      Convert an interval string like 1w3d6h into the number of seconds, time
      resolution (1 unit of the smallest specified time unit) and the modifier(
      '+', '-', or '').
          w = week
          d = day
          h = hour
          m = minute
          s = second
      '''
      match = _INTERVAL_REGEX.match(six.text_type(value))
      if match is None:
          raise ValueError('invalid time interval: \'{0}\''.format(value))
  
      result = 0
      resolution = None
      for name, multiplier in [('second', 1),
                               ('minute', 60),
                               ('hour', 60 * 60),
                               ('day', 60 * 60 * 24),
                               ('week', 60 * 60 * 24 * 7)]:
          if match.group(name) is not None:
              result += float(match.group(name)) * multiplier
              if resolution is None:
                  resolution = multiplier
  
      return result, resolution, match.group('modifier'f _parse_interval(value):
      '''
      Convert an interval string like 1w3d6h into the number of seconds, time
      resolution (1 unit of the smallest specified time unit) and the modifier(
      '+', '-', or '').
          w = week
          d = day
          h = hour
          m = minute
          s = second
      '''
      match = _INTERVAL_REGEX.match(six.text_type(value))
      if match is None:
          raise ValueError('invalid time interval: \'{0}\''.format(value))
  
      result = 0
      resolution = None
      for name, multiplier in [('second', 1),
                               ('minute', 60),
                               ('hour', 60 * 60),
                               ('day', 60 * 60 * 24),
                               ('week', 60 * 60 * 24 * 7)]:
          if match.group(name) is not None:
              result += float(match.group(name)) * multiplier
              if resolution is None:
                  resolution = multiplier
  
      return result, resolution, match.group('modifier')
docs: Convert an interval string like 1w3d6h into the number of seconds, time
      resolution (1 unit of the smallest specified time unit) and the modifier(
      '+', '-', or '').
          w = week
          d = day
          h = hour
          m = minute
          s = second