code: def rotate(self):
      self.mCurrentCounter += 1
      if self.mCurrentCounter > self.numberOfLines():
          self.mCurrentCounter = 0
      self.update()
  
imports: from math import ceil
  from PyQt5.QtCore import *
  from PyQt5.QtGui import *
  from PyQt5.QtWidgets import *
label_desc: Use image node_id 3 for calling the Spinner obj's underlying member method code with example usage: obj.rotate() without return types