code: def _expectation(self, prep_prog, operator_programs, random_seed) -> np.ndarray:
          
          if isinstance(operator_programs, Program):
              warnings.warn("You have provided a Program rather than a list of Programs. The results "
                            "from expectation will be line-wise expectation values of the "
                            "operator_programs.", SyntaxWarning)
  
          payload = expectation_payload(prep_prog, operator_programs, random_seed)
          response = post_json(self.session, self.sync_endpoint + "/qvm", payload)
          return np.asarray(response.json())
docs: Run a Forest ``expectation`` job.
  
          Users should use :py:func:`WavefunctionSimulator.expectation` instead of calling
          this directly.