返回总字符数(考虑英文和中文在终端所占字块)

        return: int

def center_num(self, string):
        """
        返回总字符数(考虑英文和中文在终端所占字块)

        return: int
        """
        l = 0
        for i in string:
            l += 2 if self.is_cn_char(i) else 1
        return l