realtime-plot.py

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

x = np.arange(0, 2*np.pi, 0.1)
y = np.sin(x)

fig = plt.gcf()
ax = plt.gca()

def plot(ax):
    return ax.plot(x, y, animated=True)[0]
line = plot(ax)

def animate(i):
    line.set_ydata(np.sin(1*x + i/100.0))
    return [line]

# We'd normally specify a reasonable "interval" here...
ani = animation.FuncAnimation(fig, animate, range(1, 200), 
                              interval=0, blit=True)
plt.show()