#!/usr/bin/env python3
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
#
fig,ax =plt.subplots()
#
x=np.arange(0, 2*np.pi, 0.01)
line,=ax.plot(x,np.sin(x))
#
def animate(i):
    line.set_ydata(np.sin(x+i/10.0))  # update the data
    return line,
#
# Init only required for blitting to give a clean slate.
def init():
    line.set_ydata(np.ma.array(x,mask=True))
    return line,
#
ani = animation.FuncAnimation(fig,animate,np.arange(1,200),\
  init_func=init,interval=25,blit=True)
plt.show()