https://www.facebook.com/kagesenshi/posts/10152687038904133?comment_id=10152687210704133 and https://www.facebook.com/groups/python.malaysia/permalink/10152645374976380/

spaghetti_spiral.go

package main

import "fmt"

func main() {
	var n, max_x, max_y, x, y, xdir, ydir int
	max_x, max_y = 5, 5

	var matrix = make([][]int, max_y)
P:
	matrix[n] = make([]int, max_x)
	n++
	if n < max_y {
		goto P
	}
	xdir, n = 1, 0
	goto spiral

done:
	fmt.Printf("%2d ", matrix[y][x])
	x++
	if x >= max_x {
		x, y = 0, y+1
		fmt.Println()
		if y >= max_y {
			return
		}
	}
	goto done

spiral:
	n++
	matrix[y][x] = n
	tries := 0

tryagain:
	x, y = x+xdir, y+ydir

	if x < 0 || x >= max_x || y < 0 || y >= max_y || matrix[y][x] > 0 {
		if tries > 0 {
			x, y = 0, 0
			goto done
		}
		tries++
		x, y = x-xdir, y-ydir
		xdir, ydir = -ydir, xdir
		goto tryagain
	}
	goto spiral
}

spaghetti_spiral.py

def spiral(max_x, max_y):
    matrix = []
    for i in range(0, max_y):
        matrix.append([0] * max_x)
    
    x, y, n, xdir, ydir = 0, 0, 0, 1, 0
    while 1:
        n, tries, matrix[y][x] = n + 1, 6, n + 1

        while 1:
            x, y, tries = x + xdir, y + ydir, tries - 1

            if (x < 0 or x >= max_x or y < 0 or y >= max_y or matrix[y][x] > 0):
                if tries == 0: break
                x, y = x - xdir, y - ydir
                xdir, ydir = -ydir, xdir
            else: break
        if tries == 0: break
    for i in matrix:
        for j in i:
            print '{0:2}'.format(j),
        print

spiral(5, 5)

cybus:spiral angch$ go run spaghetti_spiral.go
1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9

cybus:spiral angch$ python spaghetti_spiral.py
1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9