#!/usr/bin/python
from pylab import *
x,y = 0,0
xs = [x]
ys = [y]
lines = []
import time

tstart = time.time()
f = figure()
for i in xrange(50):
    print i
    t = 2*pi*rand()
    x += sin(t)
    y += cos(t)
    xs.append(x)
    ys.append(y)
    lines.append(plot(xs,ys,"b-"))
print time.time() - tstart

from matplotlib.animation import ArtistAnimation
a = ArtistAnimation(f, lines, interval=50, blit=True)
a.save('walker.mp4', 'avconv', fps=20, extra_args=['-vcodec', 'libx264']))
show()