通过data新建一个stock_block

        Arguments:
            data {[type]} -- [description]

        Returns:
            [type] -- [description]

def new(self, data):
        """通过data新建一个stock_block

        Arguments:
            data {[type]} -- [description]

        Returns:
            [type] -- [description]
        """
        temp = copy(self)
        temp.__init__(data)
        return temp