def format_dict(self, delim=':', qu="'"):
        """
        Prepares the data as a dictionary with column headers
        TODO - get variable names of data[] as strings for hdr
        """
        res = 'name' + delim + qu + self.name + qu + ','
        for num, d in enumerate(self.data):
            res += 'col' + str(num) + delim + qu + str(d) + qu + ','
        return res