#!/usr/bin/python
from pylab import *

N = 50
t = 2*pi*rand(N)
xs = cumsum(sin(t))
ys = cumsum(cos(t))

f = figure()
l, = plot([],[])
xlim(-10,10)
ylim(-10,10)

def func(i):
    print i
    l.set_data(xs[:i],ys[:i])
    return l,

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