import matplotlib
from matplotlib import pyplot as plt
import numpy as np

fig = plt.figure()

N = 20
x = np.random.rand(N)
y = np.random.rand(N)
colors = np.random.rand(N)
area = np.pi * (15 * np.random.rand(N))**2
plt.scatter(x, y, s=area, c=colors, alpha=0.5)

children = fig.get_children()
for child in children:
    if isinstance(child, matplotlib.axes.Subplot):
        cc = child.get_children()
        print(cc[0].get_facecolors())

plt.show()