def VOLMAX3(self):
    """ Volume is the max in last 3 days.
        三日內最大成交量
    """
    if self.stock_vol[-1] > self.stock_vol[-2] and self.stock_vol[-1] > self.stock_vol[-3]:
      return True
    else:
      return False
Volume is the max in last 3 days.
        三日內最大成交量