EG1
import numpy as np
import matplotlib.pyplot as plt
y = np.arange(-5, 6,1)
plt.plot(y, y*y)
plt.text(0 ,20 , ‘function:y=x*x‘ , family=‘serif‘ , size=10 , color=‘b‘ ,
style=‘italic‘ , weight=‘black‘)
plt.show()
原文：http://www.cnblogs.com/zsr0401/p/6428047.html