text: """
  Matplotlib Animation Example
  
  author: Jake Vanderplas
  email: vanderplas@astro.washington.edu
  website: http://jakevdp.github.com
  license: BSD
  Please feel free to use and modify this, but keep the above information. Thanks!
  """
  
  import numpy as np
  from matplotlib import pyplot as plt
  from matplotlib import animation
  
  # First set up the figure, the axis, and the plot element we want to animate
  fig = plt.figure()
  ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
  line, = ax.plot([], [], lw=2)
  
  # initialization function: plot the background of each frame
  def init():
      line.set_data([], [])
      return line,
  
  # animation function.  This is called sequentially
  def animate(i):
      x = np.linspace(0, 2, 1000)
      y = np.sin(2 * np.pi * (x - 0.01 * i))
      line.set_data(x, y)
      return line,
  
  # call the animator.  blit=True means only re-draw the parts that have changed.
  anim = animation.FuncAnimation(fig, animate, init_func=init,
                                 frames=200, interval=20, blit=True)
  
  
  anim.save('animation.gif', writer='imagemagick', fps=60)
  
  
  