[Python] How to make percent chance that there will be a * in a 2D array decrease

My result

I need to make the number of stars decrease with each line, but I have no idea how.

I need help!!!!

import random
import numpy as np
import sys

size = int(sys.argv[1])
mat = np.full((size, size), '\x1b[35m.')

def random_int():
random_num = random.randint(0, len(mat) - 1)
return random_num

def print_array():
for y in range(0, len(mat)):
for x in range(0, len(mat[y])):
j = random_int()
mat[y][j] = '\x1b[37m*'
print(mat[y][x], end="")
print()

print_array()

Continue reading...