import numpy as np
import matplotlib.pyplot as plt
import matplotlib.cm as cm
n = 256
angle = np.linspace(0,12*2*np.pi, n)
radius = np.linspace(.5,1.,n)
x = radius * np.cos(angle)
y = radius * np.sin(angle)
plt.scatter(x,y,c = angle, cmap = cm.hsv)
plt.show()
// Matplotlib CB