new_contents: #!/usr/bin/env python
  import pylab
  
  rU = 1.5, rV = 0.5, rE = 0.2
  dt = 0.01
  
  U = 1.0
  V = 0.01
  
  us = []
  vs = []
  
  t = 0.0
  
  while t < 10.0:
      dU_dt = -rE * U * V + rU * U * (1-U)
      dV_dt =  rE * U * V - rV * V
      U += dt * dU_dt
      V += dt * dV_dt
      us.append(U)
      vs.append(V)
  
  pylab.rcParams['figure.figsize'] = (10.0, 10.0)
  pylab.clf()
  pylab.plot(us,vs)
  pylab.savefig("lv.png")
  
subject: Test LV