Question

我的程序遇到一个小问题，因为我对Python很陌生，正在努力寻找解决方案。我已经google了一下，但似乎没有任何东西可以解决我的尝试。我的代码如下：

from PIL import Image
import numpy as np
from scipy import misc
from pandas import *

def maze_gen():
    ##Opens the Image
    im_file = Image.open('15x15.png')

    ##Reads the image pixel information
    arr = misc.imread('15x15.png')

    ##Sets the width, height and maze size variables
    width = im_file.size[0]
    height = im_file.size[1]
    size = width * height

    ##Defines the mapping, start and end points array
    map = np.zeros([width, height], dtype=np.int)
    start_pos = np.empty(shape=[1,2])
    end_pos = np.empty(shape=[1,2])

    ##Search image replacing white pixels with 1's in the mapping array
    for x in range(width):
        for y in range(height):
            if 255 in arr[x,y]:
                map[x,y] = 1

    ##Find the start and end locations
    for x in range(width):
        if map[0,x] > 0:
            start_pos = 0,x

    for x in range(width):
        if map[height -1 ,x] > 0:
            end_pos = height -1 ,x



    return width, height, size, map, start_pos, end_pos

def check_neighbours(col, row):
    width, height, size, map, start_pos, end_pos=maze_gen()

    neighbours = list()

    ##Debugging to check cell_current values are correct
    print('col =', col)
    print('row =', row)

    if (col >= 0 and col < height and row >= 0 and row < width):
            neighbours.append((col, row))
            print('Neighbours', neighbours, '\n')

    if (len(neighbours) > 0):
        return neighbours
    else:
        return None

def solver():
    width, height, size, map, start_pos, end_pos=maze_gen()

    ##Sets cell_current to the starting position    
    cell_current = start_pos

    path = list()
    path.append((cell_current))

    check_neighbours(cell_current[0]-1, cell_current[1]) ##Top neighbour
    check_neighbours(cell_current[0], cell_current[1]+1) ##Right neighbour
    check_neighbours(cell_current[0]+1, cell_current[1]) ##Bottom neighbour
    check_neighbours(cell_current[0], cell_current[1]-1) ##Left neighbour

    print('Neighbours in Solver', neighbours, '\n')

def debug():
    width, height, size, map, start_pos, end_pos=maze_gen()

    ##Prints maze information for debugging
    print ('Maze width:', width)
    print ('Maze height:', height)
    print ('Maze size:', size, '\n')

    ##Print Start and End points
    print ('Start Point')
    print (start_pos, '\n')
    print ('End Point')
    print (end_pos, '\n')

    ##Prints mapping array for debugging
    print ('Mapping Array')
    print (DataFrame(map), '\n')

if (__name__ == "__main__"):
    solver()

我遇到的问题是，每次成功运行if语句时都不会添加邻居列表。而不是获得以下读数：

col = -1 row = 1 Neighbors []

col = 0 row = 2 Neighbors [（0,2）]

col = 1 row = 1 Neighbors [（1,1）]

col = 0 row = 0 Neighbors [（0,0）]

对这个问题的任何帮助都会很棒。请记住我是python的新手，所以任何愚蠢的错误或我可以改变以使代码更好的事情请说！

Answer 1

您需要在代码中进行两项更改：

将邻居变量设为全局。
用 neighbours.append（[col，row]）替换 neighbours.append（（col，row））。这是因为您只能将变量或列表附加到现有列表。

希望这会有所帮助。

Python列表没有附加＆amp;变量未定义

1 个答案: