Parses data and builds an instance of this class

        :param data_frame: pandas DataFrame
        :return: SqlTable

def from_df(data_frame):
        """Parses data and builds an instance of this class

        :param data_frame: pandas DataFrame
        :return: SqlTable
        """
        labels = data_frame.keys().tolist()
        data = data_frame.values.tolist()
        return SqlTable(labels, data, "{:.3f}", "\n")