(self, i_j, newvalue)
Sets the element located at in the i-th line and j-th
        column.
Sets the element located at in the i-th line and j-th
        column.
Sets the element located at in the i - th line and j - th column .
def __setitem__(self, i_j, newvalue):
        """
        Sets the element located at in the i-th line and j-th
        column.
        """
        i, j = i_j
        self._array[i][j] = newvalue
def __setitem__ ( self , i_j , newvalue ) : i , j = i_j self . _array [ i ] [ j ] = newvalue