n = 5
list_chr = [[j for j in ["!"] * n ] for i in range(n)]


for a in range(len(list_chr)):
    below_the_diagonal, below_the_diagonal_count = 1, 1
    above_the_diagonal_count, above_the_diagonal = 1, 1

    for b in range(len(list_chr)):
        if a == b:
            list_chr[a][b] = 0


        elif a == b - above_the_diagonal_count:
            list_chr[a][b] = above_the_diagonal
            above_the_diagonal += 1
            above_the_diagonal_count += 1



        elif a == b + below_the_diagonal_count:
            list_chr[a][b] = "."
            below_the_diagonal += 1
            below_the_diagonal_count = 2




for k in list_chr:
    print(k)