fig.add_subplot(333)
n=20
Z=np.ones(n)
Z[-1]*=2
plt.pie(Z,explode=Z*0.05,colors=['%f'?%?(i/float(n))?for?i?in?range(n)],
????????labels=('%.2f'?%?(i?/?float(n))?for?i?in?range(n)))
plt.gca().set_aspect('equal')
plt.xticks([]),plt.yticks([])
plt.show()
TypeError:?object?of?type?'generator'?has?no?len()