/*C++*/
      /* Otherwise, bring this row up to the slot for the next free row. */
      std::swap_ranges(toggle.row_begin(pivotRow), toggle.row_end(pivotRow),
                       toggle.row_begin(nextFreeRow));

      /* Also, exchange the corresponding entries in the puzzle vector. */
      std::swap(puzzle[pivotRow], puzzle[nextFreeRow]);

#Python
        toggle[pivotRow], toggle[nextFreeRow] = toggle[nextFreeRow], toggle[pivotRow]
        puzzle[pivotRow], puzzle[nextFreeRow] = puzzle[nextFreeRow], puzzle[pivotRow]