只有二​​维数组中的第一个数组被函数更新

Only the first array inside a 2D array being updated by function

我在下面编写了这段代码来创建一个随机的数独拼图网格:

import time
import random
import math

sudoLine = [0,0,0,0,0,0,0,0,0]

#Creating mainGrid, this is a blank sudoku grid which I will place the contents of the possibleNums array into in a random order for each line.
mainGrid = [

    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],

]

possibleNums = [1,2,3,4,5,6,7,8,9]
i = 0

#Grabbing the length of the possibleNums array and reducing it by 1 to get the index position of the last element.
length = len(possibleNums) - 1

def LineFill(line,nums,count):
    length = len(nums) - 1
    i = 0
    while length > 0:
        length = len(nums) - 1
        r = random.randint(0,length)
        line[i] = nums[r]
        nums.pop(r)
        i += 1
    return line

n=0

这个 while 循环然后在那个下面,循环 mainGrid,每次改变正在填充的数组:

while n in range(0,len(mainGrid)):
    mainGrid[n] = LineFill(mainGrid[n],possibleNums,i)
    n += 1

print(mainGrid)

当我 运行 它时,只有数独网格的第一行被填充,这意味着只有列表中的第一个数组被更新,即使 while 循环应该循环遍历它们。

有人能指出我逻辑上的错误吗?

谢谢。

您的线路 nums.pop() 是问题所在。您将 possibleNums 作为 LineFill 参数 nums 传递。所以 nums 只是对 possibleNums 的引用。填充一行后,possibleNums 是一个空列表。

如果您的目的是随机填充一个数字网格,在任何给定行上都没有重复项,这里有一个更简单的方法:

In [1]: import random

In [2]: [random.sample(range(1, 10), 9) for _ in range(9)]
Out[2]:
[[3, 9, 8, 1, 2, 5, 6, 4, 7],
 [6, 7, 3, 9, 2, 5, 8, 1, 4],
 [4, 1, 9, 2, 7, 3, 5, 6, 8],
 [3, 5, 9, 4, 2, 1, 7, 8, 6],
 [7, 2, 8, 6, 1, 9, 4, 5, 3],
 [1, 8, 5, 9, 4, 6, 2, 7, 3],
 [8, 7, 1, 9, 2, 5, 3, 4, 6],
 [7, 6, 1, 5, 4, 2, 9, 3, 8],
 [7, 8, 4, 2, 5, 1, 6, 3, 9]]

请注意,此方法不会产生有效的数独解法(理论上是可能的,但概率……对您不利)——但您似乎并不希望这样做无论如何。