import matplotlib.pyplot as plt

a=[[(i-j)%2 for i in range(8)] for j in range(8)]

tick_set=[0,1,2,3,4,5,6,7]

xlab=["a","b","c",'d',"e","f","g","h"]

ylab=["1","2","3","4","5","6","7","8"]

plt.imshow(a,cmap='gray',origin="lower",)

plt.xticks(ticks=tick_set,labels=xlab)

plt.yticks(ticks=tick_set,labels=ylab)

plt.show()