code: def cipher_op(self, ciphertext, op):
      return getattr(ciphertext, f"{op.__name__}_cipherblock")
  
imports: import importlib
  import operator
  import cachetools
  import numpy
  import pytest
  import pickle
label_desc: Use image node_id 4 for calling the Suite obj's underlying member method code with example usage: obj.cipher_op(ciphertext, op) and returns: getattr