CoreQQ

n, m= 19,19
spiral = [[0] * m for _ in range(n)]
c = 'x'
wt=m
hg=n
i=1
j=1
while wt-i>=2:
    for k in range(i,wt-1):  
       spiral[j][k] = c 
    if hg-j>3:
        for l in range(j,hg-1):  
            spiral[l][wt-2] = c   
        for k in range(i,wt-2):  
            spiral[hg-2][k] = c 
        for l in range(j+2,hg-1):  
            spiral[l][i] = c 
        spiral[j+2][i+1] = c                    
    i+=2
    j+=2
    wt-=2
    hg-=2
for i in range(n):  
    for j in range(m):
        print(str(spiral[i][j]).ljust(3), end=' ')
    print()

0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
0   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   0   
0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   x   0   
0   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   0   x   0   
0   x   0   0   0   0   0   0   0   0   0   0   0   0   0   x   0   x   0   
0   x   0   x   x   x   x   x   x   x   x   x   x   x   0   x   0   x   0   
0   x   0   x   0   0   0   0   0   0   0   0   0   x   0   x   0   x   0   
0   x   0   x   0   x   x   x   x   x   x   x   0   x   0   x   0   x   0   
0   x   0   x   0   x   0   0   0   0   0   x   0   x   0   x   0   x   0   
0   x   0   x   0   x   0   x   x   x   0   x   0   x   0   x   0   x   0   
0   x   0   x   0   x   0   x   0   0   0   x   0   x   0   x   0   x   0   
0   x   0   x   0   x   0   x   x   x   x   x   0   x   0   x   0   x   0   
0   x   0   x   0   x   0   0   0   0   0   0   0   x   0   x   0   x   0   
0   x   0   x   0   x   x   x   x   x   x   x   x   x   0   x   0   x   0   
0   x   0   x   0   0   0   0   0   0   0   0   0   0   0   x   0   x   0   
0   x   0   x   x   x   x   x   x   x   x   x   x   x   x   x   0   x   0   
0   x   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   x   0   
0   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   x   0   
0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0