How to add addnotation for each point in matplotlib?

Question

I have that code:

for i, j in aa:
    plt.plot([xc[i], xc[j]], [yc[i], yc[j]], c=\'g\', zorder=0)
plt.plot(xc[0], yc[0], c=\'r\', marker=\'s\')
plt.scatter(xc