您可以尝试:

import matplotlib.pyplot as plt
import numpy as np

m=3
c=-2
x1Data= np.random.normal(scale=2, loc=.4, size=25)
y1Data= np.random.normal(scale=3, loc=1.2, size=25)
x2Data= np.random.normal(scale=1, loc=3.4, size=25)
y2Data= np.random.normal(scale=.65, loc=-.2, size=25)

fig = plt.figure()
ax = fig.add_subplot( 1, 1, 1 )
ax.scatter(x1Data, y1Data)
ax.scatter(x2Data, y2Data)
ylim = ax.get_ylim()
xlim = ax.get_xlim()
ax.plot( xlim, [ m * x + c for x in xlim ], 'r:' )
ax.set_ylim( ylim )
ax.set_xlim( xlim )
plt.show()

给出: