scatter散点图

import matplotlib.pyplot as plt
import numpy as np

n = 1024
X = np.random.normal(0,1,n)
Y = np.random.normal(0,1,n)
T = np.arctan2(Y,X) #for color value

plt.scatter(X,Y,s=75,c=T,alpha=0.5)
plt.scatter(np.arange(5),np.arange(5))

plt.xlim((-1.5,1.5))
plt.ylim((-1.5,1.5))    
plt.xticks(())
plt.yticks(())

plt.show()