带有返回值的Python回溯

Question

我已经编写了以下代码，以通过回溯方法解决数独游戏。可以打印正确的结果，但是我还没有找到一种方法来获得与返回值相同的结果，而不是打印它。如何更改程序才能使其正常工作？

import numpy as np

def find_possible(sudoku,r,c):
    """returns the possible Values as numpy array for a given position"""
    position = sudoku[r, c]
    if position == 0:
        line = sudoku[r, :]
        column = sudoku[: ,c]
        r0 = (r//3)*3
        c0 = (c//3)*3
        square = sudoku[r0:r0+3,c0:c0+3]
        numbers = np.arange(1, 10)
        blocked_numbers = np.unique(np.append(np.append(line,column),square))
        return np.setdiff1d(numbers,blocked_numbers)
    else: return np.array([])

def backtrack(sudoku):
    """solve the game with the backtracking method"""
    for r in range(9):
        for c in range(9):
            list_of_possible = find_possible(sudoku,r, c)
            if sudoku[r,c] == 0:
                for i in range(len(list_of_possible)):
                    sudoku[r,c] = list_of_possible[i]
                    backtrack(sudoku)
                    sudoku[r,c] = 0
                return

    result = sudoku
    print(result)

table = np.array([[5, 3, 0, 0, 7, 0, 0, 0, 0],
                  [6, 0, 0, 1, 9, 5, 0, 0, 0],
                  [0, 9, 8, 0, 0, 0, 0, 6, 0],
                  [8, 0, 0, 0, 6, 0, 0, 0, 3],
                  [4, 0, 0, 8, 0, 3, 0, 0, 1],
                  [7, 0, 0, 0, 2, 0, 0, 0, 6],
                  [0, 6, 0, 0, 0, 0, 2, 8, 0],
                  [0, 0, 0, 4, 1, 9, 0, 0, 5],
                  [0, 0, 0, 0, 8, 0, 0, 7, 9]])

backtrack(table)

Answer 1

您需要使用return语句。代替print(result)，使用return result