code: def getRow(self, key):
          
          return Row(self._impl.getRow(Tuple(key)._impl))
docs: Get a row by value of the indexing columns. If the index is not
          specified, gets the only row of a dataframe with no indexing columns.
  
          Args:
              key: Tuple representing the index of the desired row.
  
          Returns:
              The row.