colors.py

#!/usr/bin/python3

ten = 0

for i in range(0, 256):
    print("\033[48;5;{}m {:^5} ".format(i, i), end="")

    #print("\n\033[48;5;0mi: {}\ni % 10: {}".format(i, i % 10))

    if i % 10 == 0:
        ten = i

    if i == ten + 9:
        print()

print()