检查矩阵中给定项目周围的项目（创建迷宫）

Question

我制作了一个脚本，使用递归回溯将迷宫创建为矩阵。我选择一个随机方向移动，并检查是否已经有路径或迷宫边界。我的脚本工作正常，但是太复杂了，我不太喜欢。但是我不知道如何修改它以使其更优雅。

while len(paths) < all_positions: # while maze has unvisited areas (not all 'cells' connected to each other)
        if len(directions) == 0: # if we can't move anyway (blocked)
            row, col = random.choice(paths) # pick a random cell on a path
            directions = ['up', 'down', 'left', 'right']

        else:
            direction = random.choice(directions) # pick a random direction

            if direction == 'up':
                if row-2 > 0 and pixels[row-2, col, 0] != 255: # check a 'cell' to not move outside the maze AND check to not connect to a 'cell' that is already in path (not to make a loop)
                    row -= 2
                    dig(row+1, col) # add a 'cell' between the current one and the next one to a path
                    dig(row, col) # add the next 'cell' to a path
                    directions = ['up', 'down', 'left', 'right'] # now we can't pick any direction again
                    paths.append([row, col]) # append the 'cell' to a list of path cells
                else:
                    directions.remove(direction) # if we can't move the picked direction, the delete this direction from available directions

            if direction == 'down':
                if row+2 <= height-2 and pixels[row+2, col, 0] != 255:
                    row += 2
                    dig(row-1, col)
                    dig(row, col)
                    directions = ['up', 'down', 'left', 'right']
                    paths.append([row, col])
                else:
                    directions.remove(direction)

            if direction == 'left':
                if col-2 > 0 and pixels[row, col-2, 0] != 255:
                    col -= 2
                    dig(row, col+1)
                    dig(row, col)
                    directions = ['up', 'down', 'left', 'right']
                    paths.append([row, col])
                else:
                    directions.remove(direction)

            if direction == 'right':
                if col+2 <= width-2 and pixels[row, col+2, 0] != 255:
                    col += 2
                    dig(row, col-1)
                    dig(row, col)
                    directions = ['up', 'down', 'left', 'right']
                    paths.append([row, col])
                else:
                    directions.remove(direction)