如何用python绘制三维动态曲线

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
from matplotlib.animation import FuncAnimation

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')

def parametric_curve(t):
    x = np.sin(t)
    y = np.cos(t)
    z = t
    return x, y, z

line, = ax.plot([], [], [], 'r-', animated=True)

def update(frame):
    t = np.linspace(0, frame/10, 100)
    x, y, z = parametric_curve(t)
    line.set_data(x, y)
    line.set_3d_properties(z)
    return line,

ani = FuncAnimation(fig, update, frames=range(100), blit=True)
plt.show()