Method makeMove

src/gamesbyexample/sudoku.py:54–68

Place the number at the column (a letter from A to I) and row (an integer from 1 to 9) on the grid.

(self, column, row, number)

            y += 1

    def makeMove(self, column, row, number):
        """Place the number at the column (a letter from A to I) and row
        (an integer from 1 to 9) on the grid."""
        x = 'ABCDEFGHI'.find(column)  # Convert this to an integer.
        y = int(row) - 1

        # Check if the move is being made on a "given" number:
        if self.originalSetup[y * GRID_LENGTH + x] != EMPTY_SPACE:
            return False

        self.grid[(x, y)] = number  # Place this number on the grid.

        # We need to store a separate copy of the dictionary object:
        self.moves.append(copy.copy(self.grid))
        return True

    def undo(self):
        """Set the current grid state to the previous state in the