Shows one row of the dataframe and the field 
        names wiht count

        :return: a pandas dataframe
        :rtype: pd.DataFrame

        :example: ``ds.one()``

def one(self):
        """
        Shows one row of the dataframe and the field 
        names wiht count

        :return: a pandas dataframe
        :rtype: pd.DataFrame

        :example: ``ds.one()``
        """
        try:
            return self.show(1)
        except Exception as e:
            self.err(e, self.one, "Can not display dataframe")