code: def append_postprocessor(self, postprocessors):
      if type(postprocessors) is not list:
          postprocessors = [postprocessors]
  
      for postprocessor in postprocessors:
          self.postprocessors += [postprocessor]
  
      return None
  
imports: import os
  import csv
  import numpy
  from collections import defaultdict
  from deepneuro.utilities.conversion import save_data
  from deepneuro.utilities.util import add_parameter, replace_suffix, nifti_splitext, additional_kwargs
  from deepneuro.utilities.visualize import check_data
label_desc: Use image node_id 4 for calling the Output obj's underlying member method code with example usage: obj.append_postprocessor(postprocessors) and returns: None