如何将错误消息打印到文件？

Question

我正在创建一个数独求解器，它将已解决的谜题发送到文件中，但我们的任务之一是让求解器告诉您谜题是否无法解决。我可以让错误消息在 python 中打印，或者我可以让未解决的难题转到文件，但我不确定如何将消息发送到文件。有谁知道如何做到这一点？任何帮助表示赞赏！

def print_board(puzzle, index):
    # take the index of the board to write it to different files
    with open(f'files{index}.txt', 'w') as file: 
        #each row should have this formatting
        for vertical in range(len(puzzle)):
            if vertical % 3 == 0 and vertical != 0:
                print("- - - - - - - - - - - - - ", file=file)

            #each column should have this formatting
            for horizontal in range(len(puzzle[0])):
                if horizontal % 3 == 0 and horizontal != 0:
                    print(" | ", end="", file=file)

                if horizontal == 8:
                    print(puzzle[vertical][horizontal], file=file)
                else:
                    print(str(puzzle[vertical][horizontal]) + " ", end="", file=file)

if __name__ == "__main__":
    board_list = []
    board = []
    # open the file with puzzles in it
    with open('project.txt', 'r') as file:
        for line in file:
            # print(line)
            if line == "\n":
                print("\\n detected")
                board_list.append(board)
                print(board_list)
                board = []
            else:
                #print("constructing board")
                board.append(list(map(int, line.strip())))
        board_list.append(board)

    for i in range(len(board_list)):
        # print the final solved puzzles
       if (solve(board_list[i])):
        print_board(board_list[i], i);
       else:
           print ('no soluntion exists')

Answer 1

使用.write() 方法：

with open(f'files{index}.txt', 'w') as file:
     file.write('No solution exists.')