Append a row to the main dataframe

        :param vals: list of the row values to add
        :type vals: list
        :param index: index key, defaults to None
        :param index: any, optional

        :example: ``ds.append([0, 2, 2, 3, 4])``

def append(self, vals: list, index=None):
        """
        Append a row to the main dataframe

        :param vals: list of the row values to add
        :type vals: list
        :param index: index key, defaults to None
        :param index: any, optional

        :example: ``ds.append([0, 2, 2, 3, 4])``
        """
        try:
            self.df = self.df.loc[len(self.df.index)] = vals
        except Exception as e:
            self.err(e, self.append, "Can not append row")
            return
        self.ok("Row added to dataframe")