plt.spy()函数

import matplotlib.pyplot as plt
import numpy as np

a = np.array([[0,4,5,6,7],
              [5,0,6,6,0],
              [0,4,5,0,7],
              [1,4,0,6,3],
              [1,0,5,2,1]])
plt.spy(a)
plt.show()