'Returns a cell location relative to this cell.
:param row: number of rows to offset
:type row: int
:param column: number of columns to offset
:type column: int
:rtype: :class:`.cell.Cell`'

def offset(self, row=0, column=0):

    offset_column = get_column_letter((column_index_from_string(column=self.column) + column))
    offset_row = (self.row + row)
    return self.parent.cell(('%s%s' % (offset_column, offset_row)))
