code: def __next__(self):
      self.total += 1
      if self.total > self.data_total:
          raise StopIteration()
      return self.data_sampler()
  
imports: import os
  import ctypes
  import numpy
label_desc: Use image node_id 3 for calling the TestDataSampler obj's underlying member method code with example usage: obj.__next__() and returns: self