code: def one(self):
          
          try:
              return self.show(1)
          except Exception as e:
              self.err(e, self.one, "Can not display dataframe")
docs: Shows one row of the dataframe and the field 
          names wiht count
  
          :return: a pandas dataframe
          :rtype: pd.DataFrame
  
          :example: ``ds.one()``