>>> """
==================
Animated line plot
==================

"""
... 
... 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 / 50))  # update the data.
...     return line,
... 
... 
... ani = animation.FuncAnimation(
...     fig, animate, interval=20, blit=True, save_count=50)
... 
... # To save the animation, use e.g.
... #
... # ani.save("movie.mp4")
... #
... # or
... #
... # writer = animation.FFMpegWriter(
... #     fps=15, metadata=dict(artist='Me'), bitrate=1800)
... # ani.save("movie.mp4", writer=writer)
... 
... plt.show()
...