py

import matplotlib.pyplot as plt
import numpy as np
m = np.zeros((100,100,3),dtype = np.uint8)
for i in range(8):
    for j in range(8):
        if (i+j)%2 ==0:
            m[i*100//8:(i+1)*100//8,j*100//8:(j+1)*100//8] = 255
plt.imshow(m)
plt.show()