python-clockwise-spiral

def move_right(x,y):
    return x + 1, y
def move_left(x,y):
    return x - 1,y 
def move_up(x,y):
    return x, y - 1
def move_down(x,y):
    return x, y + 1

R, L, U, D = 1,2,3,4
    
def create_spiral(n):
    if type(n) != int:
        return []
    if n < 1:
        return []
        
    matrix = []
    for i in range(n):
        _l = []
        for j in range(n):
            _l.append(-1)
        matrix.append(_l)
    
    acc = 1
    turns = 0
    x, y = 0, 0
    matrix[y][x] = acc
    print(x,y)
    steps_x, steps_y = n - 1, n -1
    direction = R
    while True:
        if steps_x == 0 and steps_y == 0:
            break
        if turns == 3:
                print('Dicrease:', turns)
                steps_x = steps_x - 1
                steps_y = steps_y - 1
        if turns >= 4 and (turns + 3) % 2 == 0:
                print('Dicrease:', turns)
                steps_x = steps_x  - 1
                steps_y = steps_y - 1
        if direction == R:
            for i in range(steps_x):
                x,y = move_right(x,y)
                acc = acc + 1
                matrix[y][x] = acc
                print('R',x,y,'T:', acc)
            direction = D
            turns = turns + 1
            continue
        if direction == D:
            for i in range(steps_y):
                x,y = move_down(x,y)
                acc = acc + 1
                matrix[y][x] = acc
                print('D',x,y,'T:', turns)
            direction = L   
            turns = turns + 1
            continue            
        if direction == L:
            for i in range(steps_x):
                x,y = move_left(x,y)
                acc = acc + 1
                matrix[y][x] = acc 
                print('L', x,y,'T:', turns)
            direction = U
            turns = turns + 1
            continue            
        if direction == U:
            for i in range(steps_y):
                x,y = move_up(x,y)
                acc = acc + 1
                matrix[y][x] = acc 
                print('U',x,y,'T:', turns)
            direction = R
            turns = turns + 1
            continue  
    print(matrix)
    return matrix
    
    """
    1(0,0)    2(1,0)    3(2,0)     4(3,0)
    12(0,1)   13(1,1)   14(2,1)    5(3,1)
    11(0,2)   16(1,2)   15(2,2)    6(3,2)
    10(0,3)    9(1,3)    8(2,3)    7(3,3)
    """