docs: def parse_timedelta_str(str_):
      r"""
      Args:
          str_ (str):
  
      Returns:
          float: timedelta
  
      CommandLine:
          python -m utool.util_time --exec-parse_timedelta_str
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_time import *  # NOQA
          >>> str_ = '24h'
          >>> timedelta = parse_timedelta_str(str_)
          >>> result = ('timedelta = %s' % (str(timedelta),))
          >>> print(result)
          timedelta = 86400.0
      """
      if str_.endswith('m'):
          timedelta = float(str_[0:-1]) * 60
      elif str_.endswith('h'):
          timedelta = float(str_[0:-1]) * 60 * 60
      elif str_.endswith('s'):
          timedelta = float(str_[0:-1])
      else:
          raise NotImplementedError('Unknown timedelta format %r' % (str_))
      return timedelta