code: def timeparse(sval):
      
      match = re.match(r'\s*' + TIMEFORMAT + r'\s*$', sval, re.I)
      if not match or not match.group(0).strip():
          return
  
      mdict = match.groupdict()
      return sum(
          MULTIPLIERS[k] * cast(v) for (k, v) in mdict.items() if v is not None)
docs: Parse a time expression, returning it as a number of seconds.  If
      possible, the return value will be an `int`; if this is not
      possible, the return will be a `float`.  Returns `None` if a time
      expression cannot be parsed from the given string.
      Arguments:
      - `sval`: the string value to parse
      >>> timeparse('1m24s')
      84
      >>> timeparse('1.2 minutes')
      72
      >>> timeparse('1.2 seconds')
      1.2