code: def __init__(self, disp, pad, field):
      self.vmax = 0.2
      self.disp = disp
      self.field = field
      self._reset(pad)
  
imports: import time
  import matplotlib.pyplot
  import numpy
  from numpy.random import randint, randn
  from matplotlib.font_manager import FontProperties
label_desc: Use image node_id 1 to create a new Puck object  with example: obj = Puck(disp, pad, field)