#! /usr/bin/python

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as anim

x = np.arange(0, 4*np.pi, 0.1)
fig = plt.figure()
line, = plt.plot(x, np.sin(x))

def update_figure(n):
    line.set_ydata(np.sin(n)*np.sin(x))

line_anim = anim.FuncAnimation(fig, update_figure, np.arange(0, 2*np.pi, 0.1), interval=50)
plt.show()