code: def update(self, i):
      self.n0 += i / 100 % 5
      self.p.set_ydata(self.n0 % 20)
      return (self.p,)
  
imports: import matplotlib.pyplot
  import numpy
  import matplotlib.animation
label_desc: Use image node_id 3 for calling the PauseAnimation obj's underlying member method code with example usage: obj.update(i) and returns: self