code: def time_str_to_minutes(time_str):
      
      time_arr = time_str.split(":")
      hours = int(time_arr[0])
      minutes = int(time_arr[1])
      return hours * 60 + minutes
docs: 通过时间字符串计算得到这是一天中第多少分钟
      :param time_str: eg: '11:10:00'
      :return: int