# coding = utf8
import numpy as np
import matplotlib.pyplot as plt

fig,ax = plt.subplots()

xdata = np.array(np.random.uniform(-5,5,50))
ydata = np.array(np.random.uniform(-3,7,50))
measures = [np.random.normal(200,70,50)]
colors=np.sqrt(xdata**2+ydata**2)

ax.scatter(xdata,ydata,c=colors,s=measures,alpha=0.5, cmap='hsv')

plt.show()