code: def call_back(self):
      while self.pipe.poll():
          command = self.pipe.recv()
          if command is None:
              self.terminate()
              return False
          else:
              self.x.append(command[0])
              self.y.append(command[1])
              self.ax.plot(self.x, self.y, "ro")
      self.fig.canvas.draw()
      return True
  
file_path: matplotlib/galleries/examples/misc/multiprocess_sgskip.py
imports: import multiprocessing
  import time
  import matplotlib.pyplot
  import numpy
label_desc: Use image node_id 3 for calling the ProcessPlotter obj's underlying member method code with example usage: obj.call_back() and returns: True, False